# This file is a part of Julia. License is MIT: https://julialang.org/license

using Test

# Tests for @__LINE__ inside and outside of macros
# NOTE: the __LINE__ numbers for these first couple tests are significant, so
# adding any lines here will make those tests fail
@test (@__LINE__) == 8

macro macro_caller_lineno()
    @test 11 == (@__LINE__) != __source__.line > 14
    return __source__.line
end

@test @macro_caller_lineno() == (@__LINE__) > 14

# @__LINE__ in a macro expands to the location of the macrocall in the source
# while __source__.line is the location of the macro caller
macro nested_LINE_expansion()
    return quote
        return (@emit_LINE, $(__source__.line))
    end
end
macro nested_LINE_expansion2()
    return :((@emit_LINE, $(__source__.line)))
end
macro emit_LINE()
    return quote
        (@__LINE__, $(__source__.line))
    end
end
@test (@emit_LINE) == ((@__LINE__) - 3, @__LINE__)
@test @nested_LINE_expansion() == ((@__LINE__() - 4, @__LINE__() - 12), @__LINE__())
@test @nested_LINE_expansion2() == ((@__LINE__() - 5, @__LINE__() - 9), @__LINE__())

original_depot_path = copy(Base.DEPOT_PATH)
include("precompile_utils.jl")

loaded_files = String[]
push!(Base.include_callbacks, (mod::Module, fn::String) -> push!(loaded_files, fn))
include("test_sourcepath.jl")
@test length(loaded_files) == 1 && endswith(loaded_files[1], "test_sourcepath.jl")
pop!(Base.include_callbacks)
thefname = "the fname!//\\&\1*"
include_string_test_func = include_string(@__MODULE__, "include_string_test() = @__FILE__", thefname)
@test include_string_test_func() == thefname
@test include_string(@__MODULE__, "Base.source_path()", thefname) == Base.source_path()
@test isdir(Base.source_dir())
@test basename(@__FILE__) == "loading.jl"
@test isabspath(@__FILE__)

@test isdir(@__DIR__)
@test @__DIR__() == dirname(@__FILE__)
@test !endswith(@__DIR__, Base.Filesystem.path_separator)
let exename = `$(Base.julia_cmd()) --compiled-modules=yes --startup-file=no --color=no`,
    wd = sprint(show, pwd())
    s_dir = sprint(show, realpath(tempdir()))
    @test wd != s_dir
    @test readchomp(`$exename -E "@__DIR__" -i`) == wd
    @test readchomp(`$exename -E "cd(()->eval(:(@__DIR__)), $s_dir)" -i`) == s_dir
    @test readchomp(`$exename -E "@__DIR__"`) == wd # non-interactive
    @test !endswith(wd, Base.Filesystem.path_separator)
    @test !endswith(s_dir, Base.Filesystem.path_separator)
end

@test Base.in_sysimage(Base.PkgId(Base.UUID("8f399da3-3557-5675-b5ff-fb832c97cbdb"), "Libdl"))
@test Base.in_sysimage(Base.PkgId(Base.UUID("3a7fdc7e-7467-41b4-9f64-ea033d046d5b"), "NotAPackage")) == false

## Unit tests for safe file operations ##

@test Base.isaccessiblefile("/root/path/doesn't/exist") == false
@test Base.isaccessiblepath("/root/path/doesn't/exist") == false
@test Base.isaccessibledir("/root/path/doesn't/exist") == false

# Issue #5789 and PR #13542:
mktempdir() do dir
    cd(dir) do
        let true_filename = "cAsEtEsT.jl", lowered_filename="casetest.jl"
            touch(true_filename)
            @test Base.isfile_casesensitive(true_filename)
            @test !Base.isfile_casesensitive(lowered_filename)

            # check that case-sensitivity only applies to basename of a path:
            if isfile(lowered_filename) # case-insensitive filesystem
                mkdir("cAsEtEsT")
                touch(joinpath("cAsEtEsT", true_filename))
                @test Base.isfile_casesensitive(joinpath("casetest", true_filename))
                @test !Base.isfile_casesensitive(joinpath("casetest", lowered_filename))
            end
        end

        # Test Unicode normalization; pertinent for OS X
        let nfc_name = "\U00F4.jl"
            touch(nfc_name)
            @test Base.isfile_casesensitive(nfc_name)
        end
    end
end

## unit tests of project parsing ##

import Base: SHA1, PkgId, load_path, identify_package, locate_package, version_slug, dummy_uuid
import UUIDs: UUID, uuid4, uuid_version
import Random: shuffle, randstring
using Test

let shastr = "ab"^20
    hash = SHA1(shastr)
    @test hash == eval(Meta.parse(repr(hash))) # check show method
    @test string(hash) == shastr
    @test "check $hash" == "check $shastr"
end

let shastr1 = "ab"^20, shastr2 = "ac"^20
    hash1 = SHA1(shastr1)
    hash2 = SHA1(shastr2)
    @test isless(hash1, hash2)
    @test !isless(hash2, hash1)
    @test !isless(hash1, hash1)
end

# Test bad SHA1 values
@test_throws ArgumentError SHA1("this is not a valid SHA1")
@test_throws ArgumentError parse(SHA1, "either is this")
@test tryparse(SHA1, "nor this") === nothing

let uuidstr = "ab"^4 * "-" * "ab"^2 * "-" * "ab"^2 * "-" * "ab"^2 * "-" * "ab"^6
    uuid = UUID(uuidstr)
    @test uuid == eval(Meta.parse(repr(uuid))) # check show method
    @test string(uuid) == uuidstr == sprint(print, uuid)
    @test "check $uuid" == "check $uuidstr"
    @test UUID(UInt128(uuid)) == uuid
    @test UUID(uuid) === uuid
    @test UUID(convert(NTuple{2, UInt64}, uuid)) == uuid
    @test UUID(convert(NTuple{4, UInt32}, uuid)) == uuid

    uuidstr2 = "ba"^4 * "-" * "ba"^2 * "-" * "ba"^2 * "-" * "ba"^2 * "-" * "ba"^6
    uuid2 = UUID(uuidstr2)
    uuids = [uuid, uuid2]
    @test (uuids .== uuid) == [true, false]

    @test parse(UUID, uuidstr2) == uuid2
end
@test_throws ArgumentError UUID("@"^4 * "-" * "@"^2 * "-" * "@"^2 * "-" * "@"^2 * "-" * "@"^6)
@test_throws ArgumentError parse(UUID, "not a UUID")
@test tryparse(UUID, "either is this") === nothing

@testset "explicit_project_deps_get" begin
    mktempdir() do dir
        project_file = joinpath(dir, "Project.toml")
        touch(project_file) # dummy_uuid calls realpath
        # various UUIDs to work with
        proj_uuid = dummy_uuid(project_file)
        root_uuid = uuid4()
        this_uuid = uuid4()

        old_load_path = copy(LOAD_PATH)
        try
            copy!(LOAD_PATH, [project_file])
            write(project_file, """
            name = "Root"
            uuid = "$root_uuid"
            [deps]
            This = "$this_uuid"
            """)
            # look up various packages by name
            root = Base.identify_package("Root")
            this = Base.identify_package("This")
            that = Base.identify_package("That")

            @test root.uuid == root_uuid
            @test this.uuid == this_uuid
            @test that === nothing

            write(project_file, """
            name = "Root"
            This = "$this_uuid"
            [deps]
            """)
            # look up various packages by name
            root = Base.identify_package("Root")
            this = Base.identify_package("This")
            that = Base.identify_package("That")

            @test root.uuid == proj_uuid
            @test this === nothing
            @test that === nothing
        finally
            copy!(LOAD_PATH, old_load_path)
        end
    end
end

# extras
@testset "extras" begin
    mktempdir() do dir
        project_file = joinpath(dir, "Project.toml")
        touch(project_file) # dummy_uuid calls realpath
        # various UUIDs to work with
        proj_uuid = dummy_uuid(project_file)
        root_uuid = uuid4()
        this_uuid = uuid4()

        old_load_path = copy(LOAD_PATH)
        try
            copy!(LOAD_PATH, [project_file])
            write(project_file, """
            name = "Root"
            uuid = "$root_uuid"
            [extras]
            This = "$this_uuid"
            """)
            # look up various packages by name
            root = Base.identify_package("Root")
            this = Base.identify_package("This")
            that = Base.identify_package("That")

            @test root.uuid == root_uuid
            @test this === nothing
            @test that === nothing

            @test Base.get_uuid_name(project_file, this_uuid) == "This"
        finally
            copy!(LOAD_PATH, old_load_path)
        end
    end
end


## functional testing of package identification, location & loading ##

saved_load_path = copy(LOAD_PATH)
saved_depot_path = copy(DEPOT_PATH)
saved_active_project = Base.ACTIVE_PROJECT[]
watcher_counter = Ref(0)
push!(Base.active_project_callbacks, () -> watcher_counter[] += 1)
push!(Base.active_project_callbacks, () -> error("broken"))

push!(empty!(LOAD_PATH), joinpath(@__DIR__, "project"))
append!(empty!(DEPOT_PATH), [mktempdir(), joinpath(@__DIR__, "depot")])
@test watcher_counter[] == 0
@test_logs (:error, r"active project callback .* failed") Base.set_active_project(nothing)
@test watcher_counter[] == 1
pop!(Base.active_project_callbacks)

@test load_path() == [joinpath(@__DIR__, "project", "Project.toml")]

# locate `tail(names)` package by following the search path graph through `names` starting from `where`
function recurse_package(where::PkgId, name::String, names::String...)
    pkg = identify_package(where, name)
    pkg === nothing && return nothing
    return recurse_package(pkg, names...)
end

recurse_package(pkg::String) = identify_package(pkg)
recurse_package(where::PkgId, pkg::String) = identify_package(where, pkg)

function recurse_package(name::String, names::String...)
    pkg = identify_package(name)
    pkg === nothing && return nothing
    return recurse_package(pkg, names...)
end

@testset "project & manifest identify_package & locate_package" begin
    local path
    for (names, uuid, path) in [
        ("Foo",     "767738be-2f1f-45a9-b806-0234f3164144", "project/deps/Foo1/src/Foo.jl"       ),
        ("Bar.Foo", "6f418443-bd2e-4783-b551-cdbac608adf2", "project/deps/Foo2.jl/src/Foo.jl"    ),
        ("Bar",     "2a550a13-6bab-4a91-a4ee-dff34d6b99d0", "project/deps/Bar/src/Bar.jl"        ),
        ("Foo.Baz", "6801f525-dc68-44e8-a4e8-cabd286279e7", "depot/packages/Baz/81oLe/src/Baz.jl"),
        ("Foo.Qux", "b5ec9b9c-e354-47fd-b367-a348bdc8f909", "project/deps/Qux.jl"                ),
    ]
        n = map(String, split(names, '.'))
        pkg = recurse_package(n...)
        @test pkg == PkgId(UUID(uuid), n[end])
        @test joinpath(@__DIR__, normpath(path)) == locate_package(pkg)
        @test Base.compilecache_path(pkg, UInt64(0)) == Base.compilecache_path(pkg, UInt64(0))
    end
    @test identify_package("Baz") === nothing
    @test identify_package("Qux") === nothing
    @testset "equivalent package names" begin
         classes = [
            ["Foo"],
            ["Bar", "Foo.Bar"],
            ["Foo.Baz", "Bar.Baz", "Foo.Bar.Baz"],
            ["Bar.Foo", "Foo.Bar.Foo", "Foo.Baz.Foo", "Bar.Baz.Foo"],
            ["Foo.Qux", "Foo.Baz.Qux", "Bar.Baz.Qux", "Foo.Bar.Foo.Qux",
             "Bar.Foo.Qux", "Foo.Baz.Foo.Qux", "Bar.Baz.Foo.Qux", "Foo.Bar.Baz.Foo.Qux"],
            ["Baz", "Qux", "Bar.Qux", "Bar.Baz.Bar", "Bar.Foo.Bar", "Bar.Foo.Baz",
             "Bar.Foo.Qux.Foo", "Bar.Foo.Qux.Bar", "Bar.Foo.Qux.Baz"],
        ]
        for i = 1:length(classes)
            A = classes[i]
            for x in A
                X = recurse_package(map(String, split(x, '.'))...)
                for y in A
                    Y = recurse_package(map(String, split(y, '.'))...)
                    @test X == Y
                end
                for j = i+1:length(classes)
                    B = classes[j]
                    for z in B
                        Z = recurse_package(map(String, split(z, '.'))...)
                        @test X != Z
                    end
                end
            end
        end
    end
end

module NotPkgModule; end

@testset "project & manifest import" begin
    @test !@isdefined Foo
    @test !@isdefined Bar
    import Foo
    @test @isdefined Foo
    @test !@isdefined Bar
    import Bar
    @test @isdefined Foo
    @test @isdefined Bar

    @testset "module graph structure" begin
        local classes = Dict(
            "Foo1" => [Foo],
            "Bar"  => [Bar, Foo.Bar],
            "Baz"  => [Foo.Baz, Bar.Baz, Foo.Bar.Baz],
            "Foo2" => [Bar.Foo, Foo.Bar.Foo, Foo.Baz.Foo, Bar.Baz.Foo],
            "Qux"  => [Foo.Qux, Foo.Baz.Qux, Bar.Baz.Qux, Foo.Bar.Foo.Qux,
                       Bar.Foo.Qux, Foo.Baz.Foo.Qux, Bar.Baz.Foo.Qux,
                       Foo.Bar.Baz.Foo.Qux],
        )
        for (i, (this, mods)) in enumerate(classes)
            for x in mods
                @test x.this == this
                for y in mods
                    @test x === y
                end
                for (j, (that, mods′)) in enumerate(classes)
                    i == j && continue
                    for z in mods′
                        @test x !== z
                    end
                end
            end
        end
    end
    @test Foo.which == "path"

    @testset "pathof" begin
        @test pathof(Foo) == normpath(abspath(@__DIR__, "project/deps/Foo1/src/Foo.jl"))
        @test pathof(NotPkgModule) === nothing
    end

    @testset "pkgdir" begin
        @test pkgdir(Foo) == normpath(abspath(@__DIR__, "project/deps/Foo1"))
        @test pkgdir(Foo.SubFoo1) == normpath(abspath(@__DIR__, "project/deps/Foo1"))
        @test pkgdir(Foo.SubFoo2) == normpath(abspath(@__DIR__, "project/deps/Foo1"))
        @test pkgdir(NotPkgModule) === nothing

        @test pkgdir(Foo, "src") == normpath(abspath(@__DIR__, "project/deps/Foo1/src"))
        @test pkgdir(Foo.SubFoo1, "src") == normpath(abspath(@__DIR__, "project/deps/Foo1/src"))
        @test pkgdir(Foo.SubFoo2, "src") == normpath(abspath(@__DIR__, "project/deps/Foo1/src"))
        @test pkgdir(NotPkgModule, "src") === nothing
    end

    @testset "pkgversion" begin
        @test pkgversion(Foo) == v"1.2.3"
        @test pkgversion(Foo.SubFoo1) == v"1.2.3"
        @test pkgversion(Foo.SubFoo2) == v"1.2.3"
        @test pkgversion(NotPkgModule) === nothing
    end

end

## systematic generation of test environments ##

const M = 3 # number of node names
const N = 12 # different UUIDs per name
const NODES = 1:M*N
const NAMES = map(string, ('A':'Z')[1:M])
const UUIDS = [uuid4() for i = 1:M, j = 1:N]
const KIND = [(i + j) % 3 for i = 1:M, j = 1:N]
const KIND0 = filter(i -> KIND[i] == 0, NODES)
const KIND2 = filter(i -> KIND[i] == 2, NODES)

# kind 0: no project file
# kind 1: project file without name or uuid
# kind 2: project file with name and uuid

# explicit env: root can be anything, everything else kind 2
# implicit env: nodes can be anything, names must be unique

# allowed dependencies between kinds (explicit and implicit):
allowed(i::Int, j::Int) = KIND[i] ≤ KIND[j] && !(KIND[i] == KIND[j] == 1)

# node names/labels
L(i::Int) = NAMES[mod1(i, M)]

# first generate random dependency graphs

const graphs = Any[]

while length(graphs) < 100
    if (flat = rand(Bool))
        root = rand(KIND0)
        pool = root ∪ filter(i -> L(i) ≠ L(root), NODES)
        size = rand(1:N)
    else
        root = rand(NODES)
        pool = filter(i -> i ≠ root, KIND2)
        size = rand(1:length(NODES)÷2)
    end
    graph = Dict(root => Int[])
    KIND[root] ≠ 0 && push!(graph[root], root)
    for _ = 1:size
        i = rand(keys(graph))
        J = filter(pool) do j
            allowed(i, j) && all(L(j) ≠ L(k) for k in graph[i])
        end
        isempty(J) && continue
        j = rand(J)
        push!(graph[i], j)
        if j ∉ keys(graph)
            graph[j] = [j]
            flat && filter!(k -> L(k) ≠ L(j), pool)
            isempty(pool) && break
        end
    end
    roots = flat ? reduce(∪, values(graph)) : graph[root]
    for i in keys(graph)
        KIND[i] == 0 && delete!(graph, i)
    end
    t = (flat, root,
        Dict(L(i) => i for i in roots),
        Dict(i => Dict(L(j) => j for j in deps) for (i, deps) in graph))
    t in graphs || push!(graphs, t)
end

# materialize dependency graphs as explicit environments

function make_entry_point(path::String, name::String, uuid::UUID)
    mkpath(dirname(path))
    open(path, "w") do io
        print(io, """
        module $name
        name = $(repr(name))
        uuid = $(repr(string(uuid)))
        end
        """)
    end
end

function make_env(flat, root, roots, graph, paths, dummies)
    pkg(i::Int) = PkgId(KIND[i] == 2 ? UUIDS[i] : get(dummies, i, nothing), L(i))
    return (flat, pkg(root),
        Dict(n => pkg(i) for (n, i) in roots),
        Dict(pkg(i) => Dict(n => pkg(j) for (n, j) in d) for (i, d) in graph),
        Dict{PkgId,Union{Nothing,String}}(pkg(i) => path for (i, path) in paths),
    )
end

const depots = [mktempdir() for _ = 1:3]
const envs = Dict{String,Any}()

append!(empty!(DEPOT_PATH), depots)

@testset "load code uniqueness" begin
    @test allunique(UUIDS)
    @test allunique(depots)
    @test allunique(DEPOT_PATH)
end

for (flat, root, roots, graph) in graphs
    if flat
        all(KIND[i] == 2 for i in values(roots)) || continue
        all(KIND[i] == 2 for i in keys(graph)) || continue
    end
    dir = mktempdir()
    dummies = Dict{Int,UUID}()
    paths = Dict{Int,Union{Nothing,String}}()
    root_path = rand([false, true, joinpath("src", "$(randstring()).jl")])

    # generate project file
    project_file = joinpath(dir, "Project.toml")
    open(project_file, "w") do io
        name, uuid, kind = L(root), UUIDS[root], KIND[root]
        kind != 0 && println(io, "name = ", repr(name))
        kind == 2 && println(io, "uuid = ", repr(string(uuid)))
        kind == 1 && (dummies[root] = dummy_uuid(project_file))
        root_path isa String && println(io, "path = ", repr(root_path))
        println(io, "[deps]")
        for (n, i) in roots
            i == root && continue
            @assert KIND[i] == 2
            println(io, "$n = ", repr(string(UUIDS[i])))
        end
        kind == 0 && return
        # generate entry point
        if root_path == false
            kind == 2 && (paths[root] = nothing)
        else
            root_path == true && (root_path = joinpath("src", "$name.jl"))
            root_path = joinpath(dir, root_path)
            make_entry_point(root_path, name, uuid)
            paths[root] = root_path
        end
    end

    # count manifest entries
    counts = Dict(name => 0 for name in NAMES)
    for (i, _) in graph
        i == root && continue
        @assert KIND[i] == 2
        counts[L(i)] += 1
    end

    # generate manifest file
    open(joinpath(dir, "Manifest.toml"), "w") do io
        for (i, deps) in graph
            i == root && continue
            name, uuid = L(i), UUIDS[i]
            println(io, "[[$name]]")
            println(io, "uuid = ", repr(string(uuid)))
            if rand() < 2/3
                sha1 = SHA1(rand(UInt8, 20))
                println(io, "git-tree-sha1 = ", repr(string(sha1)))
                path = joinpath(
                    rand(depots), "packages",
                    name, version_slug(uuid, sha1),
                    "src", "$name.jl",
                )
                make_entry_point(path, name, uuid)
                paths[i] = path # may get overwritten below
            end
            if rand() < 1/4
                path = joinpath("deps", "$(randstring()).jl")
                println(io, "path = ", repr(path))
                path = joinpath(dir, path)
                make_entry_point(path, name, uuid)
                paths[i] = path # may overwrite path above
            end
            # neither can occur, i.e. no entry in paths
            deps = delete!(copy(deps), name)
            isempty(deps) && continue
            if all(counts[n] == 1 for n in keys(deps))
                println(io, "deps = ", repr(keys(deps)))
            else
                println(io, "  [$name.deps]")
                for (n, j) in deps
                    @assert KIND[j] == 2
                    println(io, "  $n = ", repr(string(UUIDS[j])))
                end
            end
        end
    end

    envs[dir] = make_env(flat, root, roots, graph, paths, dummies)
end

# materialize dependency graphs as implicit environments (if possible)

for (flat, root, roots, graph) in graphs
    flat || continue
    dir = mktempdir()
    dummies = Dict{Int,UUID}()
    paths = Dict{Int,Union{Nothing,String}}()

    for (name, i) in roots
        uuid, kind = UUIDS[i], KIND[i]
        # generate package entry point
        entry = joinpath(dir, name, "src", "$name.jl")
        make_entry_point(entry, name, uuid)
        paths[i] = entry
        kind == 0 && continue
        deps = delete!(copy(graph[i]), name)
        # generate project file
        project_file = joinpath(dir, name, "Project.toml")
        open(project_file, "w") do io
            kind != 0 && println(io, "name = ", repr(name))
            kind == 2 && println(io, "uuid = ", repr(string(uuid)))
            kind != 2 && (dummies[i] = dummy_uuid(project_file))
            isempty(deps) || println(io, "[deps]")
            for (n, j) in deps
                @assert KIND[j] == 2
                println(io, "  $n = ", repr(string(UUIDS[j])))
            end
        end
    end

    envs[dir] = make_env(flat, root, roots, graph, paths, dummies)
end

## use generated environments to test package loading ##

function test_find(
        roots::Dict{String,PkgId},
        graph::Dict{PkgId,Dict{String,PkgId}},
        paths::Dict{PkgId,Union{Nothing,String}},
    )
    # check direct dependencies
    for name in NAMES
        id = identify_package(name)
        @test id == get(roots, name, nothing)
        path = id === nothing ? nothing : locate_package(id)
        @test path == get(paths, id, nothing)
    end
    # check indirect dependencies
    for where in keys(graph)
        where.uuid === nothing && continue
        deps = get(graph, where, Dict(where.name => where))
        for name in NAMES
            id = identify_package(where, name)
            @test id == get(deps, name, nothing)
            path = id === nothing ? nothing : locate_package(id)
            @test path == get(paths, id, nothing)
        end
    end
end

@testset "find_package with one env in load path" begin
    for (env, (_, _, roots, graph, paths)) in envs
        push!(empty!(LOAD_PATH), env)
        test_find(roots, graph, paths)
    end
end

@testset "find_package with two envs in load path" begin
    for x = false:true,
        (env1, (_, _, roots1, graph1, paths1)) in (x ? envs : rand(envs, 10)),
        (env2, (_, _, roots2, graph2, paths2)) in (x ? rand(envs, 10) : envs)
        push!(empty!(LOAD_PATH), env1, env2)
        roots = merge(roots2, roots1)
        graph = merge(graph2, graph1)
        paths = merge(paths2, paths1)
        test_find(roots, graph, paths)
    end
end

@testset "find_package with three envs in load path" begin
    for (env1, (_, _, roots1, graph1, paths1)) in rand(envs, 10),
        (env2, (_, _, roots2, graph2, paths2)) in rand(envs, 10),
        (env3, (_, _, roots3, graph3, paths3)) in rand(envs, 10)
        push!(empty!(LOAD_PATH), env1, env2, env3)
        roots = merge(roots3, roots2, roots1)
        graph = merge(graph3, graph2, graph1)
        paths = merge(paths3, paths2, paths1)
        test_find(roots, graph, paths)
    end
end

# normalization of paths by include (#26424)
@test begin
    exc = try; include("./notarealfile.jl"); "unexpectedly reached!"; catch exc; exc; end
    @test exc isa SystemError
    exc.prefix
end == "opening file $(repr(joinpath(@__DIR__, "notarealfile.jl")))"

old_act_proj = Base.ACTIVE_PROJECT[]
pushfirst!(LOAD_PATH, "@")
try
    Base.set_active_project(joinpath(@__DIR__, "TestPkg"))
    @eval using TestPkg
finally
    Base.set_active_project(old_act_proj)
    popfirst!(LOAD_PATH)
end
@test pkgversion(TestPkg) == v"1.2.3"

@testset "--project and JULIA_PROJECT paths should be absolutified" begin
    mktempdir() do dir; cd(dir) do
        mkdir("foo")
        script = """
        using Test
        old = Base.active_project()
        cd("foo")
        @test Base.active_project() == old
        """
        cmd = `$(Base.julia_cmd()) --startup-file=no -e $(script)`
        cmd = addenv(cmd, "JULIA_PROJECT" => "foo")
        cmd = pipeline(cmd; stdout, stderr)
        @test success(cmd)
    end; end
end

# Base.active_project when version directory exist in depot, but contains no project file
mktempdir() do dir
    vdir = Base.DEFAULT_LOAD_PATH[2]
    vdir = replace(vdir, "#" => VERSION.major, count = 1)
    vdir = replace(vdir, "#" => VERSION.minor, count = 1)
    vdir = replace(vdir, "#" => VERSION.patch, count = 1)
    vdir = vdir[2:end] # remove @
    vpath = joinpath(dir, "environments", vdir)
    mkpath(vpath)
    script = "@assert startswith(Base.active_project(), $(repr(vpath)))"
    cmd = `$(Base.julia_cmd()) --startup-file=no -e $(script)`
    cmd = addenv(cmd,
        "JULIA_DEPOT_PATH" => dir,
        "JULIA_LOAD_PATH" => Sys.iswindows() ? ";" : ":")
    cmd = pipeline(cmd; stdout, stderr)
    @test success(cmd)
end

@testset "expansion of JULIA_LOAD_PATH" begin
    s = Sys.iswindows() ? ';' : ':'
    tmp = "/this/does/not/exist"
    cases = Dict{Any,Vector{String}}(
        nothing => Base.DEFAULT_LOAD_PATH,
        "" => [],
        "$s" => Base.DEFAULT_LOAD_PATH,
        "$tmp$s" => [tmp; Base.DEFAULT_LOAD_PATH],
        "$s$tmp" => [Base.DEFAULT_LOAD_PATH; tmp],
        )
    for (env, result) in pairs(cases)
        script = "LOAD_PATH == $(repr(result)) || error()"
        cmd = `$(Base.julia_cmd()) --startup-file=no -e $script`
        cmd = addenv(cmd, "JULIA_LOAD_PATH" => env)
        cmd = pipeline(cmd; stdout, stderr)
        @test success(cmd)
    end
end

@testset "expansion of JULIA_DEPOT_PATH" begin
    s = Sys.iswindows() ? ';' : ':'
    tmp = "/this/does/not/exist"
    default = joinpath(homedir(), ".julia")
    bundled = Base.append_bundled_depot_path!(String[])
    cases = Dict{Any,Vector{String}}(
        nothing => [default; bundled],
        "" => [],
        "$s" => [default; bundled],
        "$tmp$s" => [tmp; bundled],
        "$s$tmp" => [bundled; tmp],
        )
    for (env, result) in pairs(cases)
        script = "DEPOT_PATH == $(repr(result)) || error(\"actual depot \" * join(DEPOT_PATH,':') * \" does not match expected depot \" * join($(repr(result)), ':'))"
        cmd = `$(Base.julia_cmd()) --startup-file=no -e $script`
        cmd = addenv(cmd, "JULIA_DEPOT_PATH" => env)
        cmd = pipeline(cmd; stdout, stderr)
        @test success(cmd)
    end
end

@testset "Issue #25719" begin
    empty!(LOAD_PATH)
    @test Base.root_module(Core, :Core) == Core
    push!(LOAD_PATH, "@stdlib")
    @test Base.root_module(Base, :Test) == Test
    @test_throws KeyError(:SomeNonExistentPackage) Base.root_module(Base, :SomeNonExistentPackage)
end

## cleanup after tests ##

for env in keys(envs)
    rm(env, force=true, recursive=true)
end
for depot in depots
    try
        rm(depot, force=true, recursive=true)
    catch err
        @show err
    end
end

append!(empty!(LOAD_PATH), saved_load_path)
append!(empty!(DEPOT_PATH), saved_depot_path)
pop!(Base.active_project_callbacks)
Base.set_active_project(saved_active_project)
@test watcher_counter[] == 3

# issue #28190
module Foo28190; import Libdl; end
import .Foo28190.Libdl; import Libdl
@test Foo28190.Libdl === Libdl

@testset "include with mapexpr" begin
    let exprs = Any[]
        @test 13 === include_string(@__MODULE__, "1+1\n3*4") do ex
            ex isa LineNumberNode || push!(exprs, ex)
            Meta.isexpr(ex, :call) ? :(1 + $ex) : ex
        end
        @test exprs == [:(1 + 1), :(3 * 4)]
    end
    # test using test_exec.jl, just because that is the shortest handy file
    for incl in (include, (mapexpr,path) -> Base.include(mapexpr, @__MODULE__, path))
        let exprs = Any[]
            incl("test_exec.jl") do ex
                ex isa LineNumberNode || push!(exprs, ex)
                Meta.isexpr(ex, :macrocall) ? :nothing : ex
            end
            @test length(exprs) == 2 && exprs[1] == :(using Test)
            @test Meta.isexpr(exprs[2], :macrocall) &&
                  exprs[2].args[[1,3]] == [Symbol("@test"), :(1 == 2)]
        end
    end
end

@testset "`::AbstractString` constraint on the path argument to `include`" begin
    for m ∈ (NotPkgModule, evalfile("testhelpers/just_module.jl"))
        let i = m.include
            @test !applicable(i, (nothing,))
            @test !applicable(i, (identity, nothing,))
            @test !hasmethod(i, Tuple{Nothing})
            @test !hasmethod(i, Tuple{Function,Nothing})
        end
    end
end

@testset "`Base.project_names` and friends" begin
    # Some functions in Pkg assumes that these tuples have the same length
    n = length(Base.project_names)
    @test length(Base.preferences_names) == n

    # there are two manifest names per project name
    @test length(Base.manifest_names) == 2n
end

@testset "Manifest formats" begin
    deps = Dict{String,Any}(
        "Serialization" => Any[Dict{String, Any}("uuid"=>"9e88b42a-f829-5b0c-bbe9-9e923198166b")],
        "Random"        => Any[Dict{String, Any}("deps"=>["Serialization"], "uuid"=>"9a3f8284-a2c9-5f02-9a11-845980a1fd5c")],
        "Logging"       => Any[Dict{String, Any}("uuid"=>"56ddb016-857b-54e1-b83d-db4d58db5568")]
    )

    @testset "v1.0" begin
        env_dir = joinpath(@__DIR__, "manifest", "v1.0")
        manifest_file = joinpath(env_dir, "Manifest.toml")
        isfile(manifest_file) || error("Reference manifest is missing")
        raw_manifest = Base.parsed_toml(manifest_file)
        @test Base.is_v1_format_manifest(raw_manifest)
        @test Base.get_deps(raw_manifest) == deps
    end

    @testset "v2.0" begin
        env_dir = joinpath(@__DIR__, "manifest", "v2.0")
        manifest_file = joinpath(env_dir, "Manifest.toml")
        isfile(manifest_file) || error("Reference manifest is missing")
        raw_manifest = Base.parsed_toml(manifest_file)
        @test Base.is_v1_format_manifest(raw_manifest) == false
        @test Base.get_deps(raw_manifest) == deps
    end
end

@testset "Manifest name preferential loading" begin
    mktempdir() do tmp
        proj = joinpath(tmp, "Project.toml")
        touch(proj)
        for man_name in (
            "Manifest.toml",
            "JuliaManifest.toml",
            "Manifest-v$(VERSION.major).$(VERSION.minor).toml",
            "JuliaManifest-v$(VERSION.major).$(VERSION.minor).toml"
            )
            touch(joinpath(tmp, man_name))
            man = basename(Base.project_file_manifest_path(proj))
            @test man == man_name
        end
    end
    mktempdir() do tmp
        # check that another version isn't preferred
        proj = joinpath(tmp, "Project.toml")
        touch(proj)
        touch(joinpath(tmp, "Manifest-v1.5.toml"))
        @test Base.project_file_manifest_path(proj) === nothing
        touch(joinpath(tmp, "Manifest.toml"))
        man = basename(Base.project_file_manifest_path(proj))
        @test man == "Manifest.toml"
    end
end

@testset "Preferences loading" begin
    mktempdir() do dir
        this_uuid = uuid4()
        that_uuid = uuid4()

        # First, create outer environment with exported preferences
        mkpath(joinpath(dir, "outer_env"))
        open(joinpath(dir, "outer_env", "Project.toml"), write=true) do io
            write(io, """
            [deps]
            This = "$(this_uuid)"
            That = "$(that_uuid)"

            [preferences.This]
            pref1 = "outer-project"
            pref2 = "outer-project"
            pref3 = "outer-project"
            pref4 = "outer-project"
            pref5 = "outer-project"
            pref6 = "outer-project"

            [preferences.That]
            pref1 = "outer-project"
            """)
        end

        # Override some of those preferences above here:
        open(joinpath(dir, "outer_env", "JuliaLocalPreferences.toml"), write=true) do io
            write(io, """
            [This]
            pref2 = "outer-jlp"
            """)
        end

        # Ensure that a `JuliaLocalPreferences.toml` disables `LocalPreferences.toml`
        # We test that both overriding `pref2` and trying to clear `pref5` are ignored
        open(joinpath(dir, "outer_env", "LocalPreferences.toml"), write=true) do io
            write(io, """
            [This]
            pref2 = "outer-lp"
            __clear__ = ["pref5"]
            """)
        end

        # Next, set up an inner environment that will override some of the preferences
        # set by the outer environment, even clearing `pref6`.
        mkpath(joinpath(dir, "inner_env"))
        open(joinpath(dir, "inner_env", "Project.toml"), write=true) do io
            write(io, """
            name = "Root"
            uuid = "$(uuid4())"

            [extras]
            This = "$(this_uuid)"

            [preferences.This]
            pref3 = "inner-project"
            pref4 = "inner-project"
            __clear__ = ["pref6"]
            """)
        end

        # And have an override here as well, this time only LocalPreferences.toml
        open(joinpath(dir, "inner_env", "LocalPreferences.toml"), write=true) do io
            write(io, """
            [This]
            pref4 = "inner-lp"
            """)
        end

        # Finally, we load preferences with a stacked environment, and ensure that
        # we get the appropriate outputs:
        old_load_path = copy(LOAD_PATH)
        try
            copy!(LOAD_PATH, [joinpath(dir, "inner_env", "Project.toml"), joinpath(dir, "outer_env", "Project.toml")])

            function test_this_prefs(this_prefs)
                @test this_prefs["pref1"] == "outer-project"
                @test this_prefs["pref2"] == "outer-jlp"
                @test this_prefs["pref3"] == "inner-project"
                @test this_prefs["pref4"] == "inner-lp"
                @test this_prefs["pref5"] == "outer-project"
                @test !haskey(this_prefs, "pref6")
            end

            # Test directly loading the UUID we're interested in
            test_this_prefs(Base.get_preferences(this_uuid))

            # Also test loading _all_ preferences
            all_prefs = Base.get_preferences()
            @test haskey(all_prefs, "This")
            @test haskey(all_prefs, "That")
            @test all_prefs["That"]["pref1"] == "outer-project"

            # Ensure that the sub-tree of `This` still satisfies our tests
            test_this_prefs(all_prefs["This"])
        finally
            copy!(LOAD_PATH, old_load_path)
        end
    end
end


@testset "Loading with incomplete manifest/depot #45977" begin
    mktempdir() do tmp
        # Set up a stacked env.
        cp(joinpath(@__DIR__, "depot"), joinpath(tmp, "depot"))

        mkdir(joinpath(tmp, "Env1"))
        mkdir(joinpath(tmp, "Global"))

        for env in ["Env1", "Global"]
            write(joinpath(tmp, env, "Project.toml"), """
            [deps]
            Baz = "6801f525-dc68-44e8-a4e8-cabd286279e7"
            """)
        end

        write(joinpath(tmp, "Global", "Manifest.toml"), """
            [[Baz]]
            uuid = "6801f525-dc68-44e8-a4e8-cabd286279e7"
            git-tree-sha1 = "efc7e24c53d6a328011975294a2c75fed2f9800a"
            """)

        # This SHA does not exist in the depot.
        write(joinpath(tmp, "Env1", "Manifest.toml"), """
            [[Baz]]
            uuid = "6801f525-dc68-44e8-a4e8-cabd286279e7"
            git-tree-sha1 = "5f2f6e72d001b014b48b26ec462f3714c342e167"
            """)


        old_load_path = copy(LOAD_PATH)
        old_depot_path = copy(DEPOT_PATH)
        try
            empty!(LOAD_PATH)
            push!(empty!(DEPOT_PATH), joinpath(tmp, "depot"))

            push!(LOAD_PATH, joinpath(tmp, "Global"))

            pkg = Base.identify_package("Baz")
            # Package in manifest in current env not present in depot
            @test Base.locate_package(pkg) !== nothing

            @test Base.find_package("Baz") !== nothing  # coverage

            pushfirst!(LOAD_PATH, joinpath(tmp, "Env1"))

            @test Base.locate_package(pkg) === nothing

            write(joinpath(tmp, "Env1", "Manifest.toml"), """
            """)
            # Package in current env not present in manifest
            pkg, env = Base.identify_package_env("Baz")
            @test Base.locate_package(pkg, env) === nothing
        finally
            copy!(LOAD_PATH, old_load_path)
            copy!(DEPOT_PATH, old_depot_path)
        end
    end
end

@testset "Extensions" begin
    test_ext = """
    function test_ext(parent::Module, ext::Symbol)
        _ext = Base.get_extension(parent, ext)
        _ext isa Module || error("expected extension \$ext to be loaded")
        _pkgdir = pkgdir(_ext)
        _pkgdir == pkgdir(parent) != nothing || error("unexpected extension \$ext pkgdir path: \$_pkgdir")
        _pkgversion = pkgversion(_ext)
        _pkgversion == pkgversion(parent) || error("unexpected extension \$ext version: \$_pkgversion")
    end
    """
    depot_path = mktempdir()
    try
        proj = joinpath(@__DIR__, "project", "Extensions", "HasDepWithExtensions.jl")

        function gen_extension_cmd(compile, distr=false)
            load_distr = distr ? "using Distributed; addprocs(1)" : ""
            ew = distr ? "@everywhere" : ""
            cmd = """
            $load_distr
            begin
                $ew $test_ext
                $ew push!(empty!(DEPOT_PATH), $(repr(depot_path)))
                using HasExtensions
                $ew using HasExtensions
                $ew Base.get_extension(HasExtensions, :Extension) === nothing || error("unexpectedly got an extension")
                $ew HasExtensions.ext_loaded && error("ext_loaded set")
                using HasDepWithExtensions
                $ew using HasDepWithExtensions
                $ew test_ext(HasExtensions, :Extension)
                $ew Base.get_extension(HasExtensions, :Extension).extvar == 1 || error("extvar in Extension not set")
                $ew HasExtensions.ext_loaded || error("ext_loaded not set")
                $ew HasExtensions.ext_folder_loaded && error("ext_folder_loaded set")
                $ew HasDepWithExtensions.do_something() || error("do_something errored")
                using ExtDep2
                $ew using ExtDep2
                using ExtDep3
                $ew using ExtDep3
                $ew HasExtensions.ext_dep_loaded || error("ext_dep_loaded not set")
            end
            """
            return `$(Base.julia_cmd()) $compile --startup-file=no -e $cmd`
        end

        for compile in (`--compiled-modules=no`, ``, ``) # Once when requiring precompilation, once where it is already precompiled
            cmd = gen_extension_cmd(compile)
            cmd = addenv(cmd, "JULIA_LOAD_PATH" => proj)
            cmd = pipeline(cmd; stdout, stderr)
            @test success(cmd)
        end

        sep = Sys.iswindows() ? ';' : ':'

        cmd = gen_extension_cmd(``, true)
        cmd = addenv(cmd, "JULIA_LOAD_PATH" => join([proj, "@stdlib"], sep))
        str = read(cmd, String)
        @test !occursin("Error during loading of extension", str)
        @test !occursin("ConcurrencyViolationError", str)

        # 48351
        cmd = gen_extension_cmd(``)
        cmd = addenv(cmd, "JULIA_LOAD_PATH" => join([mktempdir(), proj], sep))
        cmd = pipeline(cmd; stdout, stderr)
        @test success(cmd)

        # Only load env from where package is loaded
        envs = [joinpath(@__DIR__, "project", "Extensions", "EnvWithHasExtensionsv2"), joinpath(@__DIR__, "project", "Extensions", "EnvWithHasExtensions")]
        cmd = addenv(```$(Base.julia_cmd()) --startup-file=no -e '
        begin
            push!(empty!(DEPOT_PATH), '$(repr(depot_path))')
            using HasExtensions
            using ExtDep
            Base.get_extension(HasExtensions, :Extension) === nothing || error("unexpectedly loaded ext from other env")
            Base.get_extension(HasExtensions, :Extension2) === nothing && error("did not load ext from active env")
        end
        '
        ```, "JULIA_LOAD_PATH" => join(envs, sep))
        @test success(cmd)

        test_ext_proj = """
        begin
            $test_ext
            using HasExtensions
            using ExtDep
            test_ext(HasExtensions, :Extension)
            using ExtDep2
            test_ext(HasExtensions, :ExtensionFolder)
            using ExtDep3
            test_ext(HasExtensions, :ExtensionDep)
        end
        """
        for compile in (`--compiled-modules=no`, ``)
            cmd_proj_ext = `$(Base.julia_cmd()) $compile --startup-file=no -e $test_ext_proj`
            proj = joinpath(@__DIR__, "project", "Extensions")
            cmd_proj_ext = addenv(cmd_proj_ext, "JULIA_LOAD_PATH" => join([joinpath(proj, "HasExtensions.jl"), joinpath(proj, "EnvWithDeps")], sep))
            run(cmd_proj_ext)
        end

        # Sysimage extensions
        # The test below requires that LinearAlgebra is in the sysimage and that it has not been loaded yet.
        # if it gets moved out, this test will need to be updated.
        # We run this test in a new process so we are not vulnerable to a previous test having loaded LinearAlgebra
        sysimg_ext_test_code = """
            uuid_key = Base.PkgId(Base.UUID("37e2e46d-f89d-539d-b4ee-838fcccc9c8e"), "LinearAlgebra")
            Base.in_sysimage(uuid_key) || error("LinearAlgebra not in sysimage")
            haskey(Base.explicit_loaded_modules, uuid_key) && error("LinearAlgebra already loaded")
            using HasExtensions
            Base.get_extension(HasExtensions, :LinearAlgebraExt) === nothing || error("unexpectedly got an extension")
            using LinearAlgebra
            haskey(Base.explicit_loaded_modules, uuid_key) || error("LinearAlgebra not loaded")
            Base.get_extension(HasExtensions, :LinearAlgebraExt) isa Module || error("expected extension to load")
        """
        cmd =  `$(Base.julia_cmd()) --startup-file=no -e $sysimg_ext_test_code`
        cmd = addenv(cmd, "JULIA_LOAD_PATH" => join([proj, "@stdlib"], sep))
        run(cmd)


        # Extensions in implicit environments
        old_load_path = copy(LOAD_PATH)
        try
            empty!(LOAD_PATH)
            push!(LOAD_PATH, joinpath(@__DIR__, "project", "Extensions", "ImplicitEnv"))
            pkgid_B = Base.PkgId(Base.uuid5(Base.identify_package("A").uuid, "BExt"), "BExt")
            @test Base.identify_package(pkgid_B, "B") isa Base.PkgId
        finally
            copy!(LOAD_PATH, old_load_path)
        end

        # Extension with cycles in dependencies
        code = """
        using CyclicExtensions
        Base.get_extension(CyclicExtensions, :ExtA) isa Module || error("expected extension to load")
        Base.get_extension(CyclicExtensions, :ExtB) isa Module || error("expected extension to load")
        CyclicExtensions.greet()
        """
        proj = joinpath(@__DIR__, "project", "Extensions", "CyclicExtensions")
        cmd =  `$(Base.julia_cmd()) --startup-file=no -e $code`
        cmd = addenv(cmd, "JULIA_LOAD_PATH" => proj)
        @test occursin("Hello Cycles!", String(read(cmd)))

    finally
        try
            rm(depot_path, force=true, recursive=true)
        catch err
            @show err
        end
    end
end

pkgimage(val) = val == 1 ? `--pkgimages=yes` : `--pkgimages=no`
opt_level(val) = `-O$val`
debug_level(val) = `-g$val`
inline(val) = val == 1 ? `--inline=yes` : `--inline=no`
check_bounds(val) = if val == 0
    `--check-bounds=auto`
elseif val == 1
    `--check-bounds=yes`
elseif val == 2
    `--check-bounds=no`
end

@testset "CacheFlags" begin
    cf = Base.CacheFlags()
    opts = Base.JLOptions()
    @test cf.use_pkgimages == opts.use_pkgimages
    @test cf.debug_level == opts.debug_level
    @test cf.check_bounds == opts.check_bounds
    @test cf.inline == opts.can_inline
    @test cf.opt_level == opts.opt_level

    # OOICCDDP
    for (P, D, C, I, O) in Iterators.product(0:1, 0:2, 0:2, 0:1, 0:3)
        julia = joinpath(Sys.BINDIR, Base.julia_exename())
        script = """
        let
            cf = Base.CacheFlags()
            opts = Base.JLOptions()
            cf.use_pkgimages == opts.use_pkgimages == $P || error("use_pkgimages")
            cf.debug_level == opts.debug_level == $D || error("debug_level")
            cf.check_bounds == opts.check_bounds == $C || error("check_bounds")
            cf.inline == opts.can_inline == $I || error("inline")
            cf.opt_level == opts.opt_level == $O || error("opt_level")
        end
        """
        cmd = `$julia $(pkgimage(P)) $(opt_level(O)) $(debug_level(D)) $(check_bounds(C)) $(inline(I)) -e $script`
        @test success(pipeline(cmd; stdout, stderr))
    end

    cf = Base.CacheFlags(255)
    @test cf.use_pkgimages
    @test cf.debug_level == 3
    @test cf.check_bounds == 3
    @test cf.inline
    @test cf.opt_level == 3

    io = PipeBuffer()
    show(io, cf)
    @test read(io, String) == "use_pkgimages = true, debug_level = 3, check_bounds = 3, inline = true, opt_level = 3"
end

empty!(Base.DEPOT_PATH)
append!(Base.DEPOT_PATH, original_depot_path)

module loaded_pkgid1 end
module loaded_pkgid2 end
module loaded_pkgid3 end
module loaded_pkgid4 end

@testset "loading deadlock detector" begin
    pkid1 = Base.PkgId("pkgid1")
    pkid2 = Base.PkgId("pkgid2")
    pkid3 = Base.PkgId("pkgid3")
    pkid4 = Base.PkgId("pkgid4")
    build_id = UInt128(0)
    e = Base.Event()
    @test nothing === @lock Base.require_lock Base.start_loading(pkid4, build_id, false)     # module pkgid4
    @test nothing === @lock Base.require_lock Base.start_loading(pkid1, build_id, false)     # module pkgid1
    t1 = @async begin
        @test nothing === @lock Base.require_lock Base.start_loading(pkid2, build_id, false) # @async module pkgid2; using pkgid1; end
        notify(e)
        @test loaded_pkgid1 == @lock Base.require_lock Base.start_loading(pkid1, build_id, false)
        @lock Base.require_lock Base.end_loading(pkid2, loaded_pkgid2)
    end
    wait(e)
    reset(e)
    t2 = @async begin
        @test nothing === @lock Base.require_lock Base.start_loading(pkid3, build_id, false) # @async module pkgid3; using pkgid2; end
        notify(e)
        @test loaded_pkgid2 == @lock Base.require_lock Base.start_loading(pkid2, build_id, false)
        @lock Base.require_lock Base.end_loading(pkid3, loaded_pkgid3)
    end
    wait(e)
    reset(e)
    @test_throws(ConcurrencyViolationError("deadlock detected in loading pkgid3 -> pkgid2 -> pkgid1 -> pkgid3 && pkgid4"),
        @lock Base.require_lock Base.start_loading(pkid3, build_id, false)).value            # try using pkgid3
    @test_throws(ConcurrencyViolationError("deadlock detected in loading pkgid4 -> pkgid4 && pkgid1"),
        @lock Base.require_lock Base.start_loading(pkid4, build_id, false)).value            # try using pkgid4
    @lock Base.require_lock Base.end_loading(pkid1, loaded_pkgid1)        # end
    @lock Base.require_lock Base.end_loading(pkid4, loaded_pkgid4)        # end
    wait(t2)
    wait(t1)
end

@testset "Upgradable stdlibs" begin
    @test success(`$(Base.julia_cmd()) --startup-file=no -e 'using DelimitedFiles'`)
    @test success(`$(Base.julia_cmd()) --startup-file=no -e 'using Statistics'`)
end

@testset "relocatable upgrades #51989" begin
    mktempdir() do depot
        # realpath is needed because Pkg is used for one of the precompile paths below, and Pkg calls realpath on the
        # project path so the cache file slug will be different if the tempdir is given as a symlink
        # (which it often is on MacOS) which would break the test.
        project_path = joinpath(realpath(depot), "project")
        mkpath(project_path)

        # Create fake `Foo.jl` package with two files:
        foo_path = joinpath(depot, "dev", "Foo51989")
        mkpath(joinpath(foo_path, "src"))
        open(joinpath(foo_path, "src", "Foo51989.jl"); write=true) do io
            println(io, """
            module Foo51989
            include("internal.jl")
            end
            """)
        end
        open(joinpath(foo_path, "src", "internal.jl"); write=true) do io
            println(io, "const a = \"asd\"")
        end
        open(joinpath(foo_path, "Project.toml"); write=true) do io
            println(io, """
            name = "Foo51989"
            uuid = "00000000-0000-0000-0000-000000000001"
            version = "1.0.0"
            """)
        end

        # In our depot, `dev` and then `precompile` this `Foo` package.
        @test success(addenv(
            `$(Base.julia_cmd()) --project=$project_path --startup-file=no -e 'import Pkg; Pkg.develop("Foo51989"); Pkg.precompile(); exit(0)'`,
            "JULIA_DEPOT_PATH" => depot))

        # Get the size of the generated `.ji` file so that we can ensure that it gets altered
        foo_compiled_path = joinpath(depot, "compiled", "v$(VERSION.major).$(VERSION.minor)", "Foo51989")
        cache_path = joinpath(foo_compiled_path, only(filter(endswith(".ji"), readdir(foo_compiled_path))))
        cache_size = filesize(cache_path)

        # Next, remove the dependence on `internal.jl` and delete it:
        rm(joinpath(foo_path, "src", "internal.jl"))
        open(joinpath(foo_path, "src", "Foo51989.jl"); write=true) do io
            truncate(io, 0)
            println(io, """
            module Foo51989
            end
            """)
        end

        # Try to load `Foo`; this should trigger recompilation, not an error!
        @test success(addenv(
            `$(Base.julia_cmd()) --project=$project_path --startup-file=no -e 'using Foo51989; exit(0)'`,
            "JULIA_DEPOT_PATH" => depot,
        ))

        # Ensure that there is still only one `.ji` file (it got replaced
        # and the file size changed).
        @test length(filter(endswith(".ji"), readdir(foo_compiled_path))) == 1
        @test filesize(cache_path) != cache_size
    end
end

@testset "code coverage disabled during precompilation" begin
    mktempdir() do depot
        cov_test_dir = joinpath(@__DIR__, "project", "deps", "CovTest.jl")
        cov_cache_dir = joinpath(depot, "compiled", "v$(VERSION.major).$(VERSION.minor)", "CovTest")
        function rm_cov_files()
            for cov_file in filter(endswith(".cov"), readdir(joinpath(cov_test_dir, "src"), join=true))
                rm(cov_file)
            end
            @test !cov_exists()
        end
        cov_exists() = !isempty(filter(endswith(".cov"), readdir(joinpath(cov_test_dir, "src"))))

        rm_cov_files() # clear out any coverage files first
        @test !cov_exists()

        cd(cov_test_dir) do
            # In our depot, precompile CovTest.jl with coverage on
            @test success(addenv(
                `$(Base.julia_cmd()) --startup-file=no --pkgimage=yes --code-coverage=@ --project -e 'using CovTest; exit(0)'`,
                "JULIA_DEPOT_PATH" => depot,
            ))
            @test !isempty(filter(!endswith(".ji"), readdir(cov_cache_dir))) # check that object cache file(s) exists
            @test !cov_exists()
            rm_cov_files()

            # same again but call foo(), which is in the pkgimage, and should generate coverage
            @test success(addenv(
                `$(Base.julia_cmd()) --startup-file=no --pkgimage=yes --code-coverage=@ --project -e 'using CovTest; foo(); exit(0)'`,
                "JULIA_DEPOT_PATH" => depot,
            ))
            @test cov_exists()
            rm_cov_files()

            # same again but call bar(), which is NOT in the pkgimage, and should generate coverage
            @test success(addenv(
                `$(Base.julia_cmd()) --startup-file=no --pkgimage=yes --code-coverage=@ --project -e 'using CovTest; bar(); exit(0)'`,
                "JULIA_DEPOT_PATH" => depot,
            ))
            @test cov_exists()
            rm_cov_files()
        end
    end
end

@testset "command-line flags" begin
    mktempdir() do depot_path mktempdir() do dir
        # generate a Parent.jl and Child.jl package, with Parent depending on Child
        open(joinpath(dir, "Child.jl"), "w") do io
            println(io, """
                module Child
                end""")
        end
        open(joinpath(dir, "Parent.jl"), "w") do io
            println(io, """
                module Parent
                using Child
                end""")
        end

        # helper function to load a package and return the output
        function load_package(name, args=``)
            code = "using $name"
            cmd = addenv(`$(Base.julia_cmd()) -e $code $args`,
                        "JULIA_LOAD_PATH" => dir,
                        "JULIA_DEPOT_PATH" => depot_path,
                        "JULIA_DEBUG" => "loading")

            out = Pipe()
            proc = run(pipeline(cmd, stdout=out, stderr=out))
            close(out.in)

            log = @async String(read(out))
            @test success(proc)
            fetch(log)
        end

        log = load_package("Parent", `--compiled-modules=no --pkgimages=no`)
        @test !occursin(r"Generating (cache|object cache) file", log)
        @test !occursin(r"Loading (cache|object cache) file", log)


        ## tests for `--compiled-modules`, which generates cache files

        log = load_package("Child", `--compiled-modules=yes --pkgimages=no`)
        @test occursin(r"Generating cache file for Child", log)
        @test occursin(r"Loading cache file .+ for Child", log)

        # with `--compiled-modules=existing` we should only precompile Child
        log = load_package("Parent", `--compiled-modules=existing --pkgimages=no`)
        @test !occursin(r"Generating cache file for Child", log)
        @test occursin(r"Loading cache file .+ for Child", log)
        @test !occursin(r"Generating cache file for Parent", log)
        @test !occursin(r"Loading cache file .+ for Parent", log)

        # the default is `--compiled-modules=yes`, which should now precompile Parent
        log = load_package("Parent", `--pkgimages=no`)
        @test !occursin(r"Generating cache file for Child", log)
        @test occursin(r"Loading cache file .+ for Child", log)
        @test occursin(r"Generating cache file for Parent", log)
        @test occursin(r"Loading cache file .+ for Parent", log)


        ## tests for `--pkgimages`, which generates object cache files

        log = load_package("Child", `--compiled-modules=yes --pkgimages=yes`)
        @test occursin(r"Generating object cache file for Child", log)
        @test occursin(r"Loading object cache file .+ for Child", log)

        # with `--pkgimages=existing` we should only generate code for Child
        log = load_package("Parent", `--compiled-modules=yes --pkgimages=existing`)
        @test !occursin(r"Generating object cache file for Child", log)
        @test occursin(r"Loading object cache file .+ for Child", log)
        @test !occursin(r"Generating object cache file for Parent", log)
        @test !occursin(r"Loading object cache file .+ for Parent", log)

        # the default is `--pkgimages=yes`, which should now generate code for Parent
        log = load_package("Parent")
        @test !occursin(r"Generating object cache file for Child", log)
        @test occursin(r"Loading object cache file .+ for Child", log)
        @test occursin(r"Generating object cache file for Parent", log)
        @test occursin(r"Loading object cache file .+ for Parent", log)
    end end
end

@testset "including non-existent file throws proper error #52462" begin
    mktempdir() do depot
        project_path = joinpath(depot, "project")
        mkpath(project_path)

        # Create a `Foo.jl` package
        foo_path = joinpath(depot, "dev", "Foo52462")
        mkpath(joinpath(foo_path, "src"))
        open(joinpath(foo_path, "src", "Foo52462.jl"); write=true) do io
            println(io, """
            module Foo52462
            include("non-existent.jl")
            end
            """)
        end
        open(joinpath(foo_path, "Project.toml"); write=true) do io
            println(io, """
            name = "Foo52462"
            uuid = "00000000-0000-0000-0000-000000000001"
            version = "1.0.0"
            """)
        end

        file = joinpath(depot, "dev", "non-existent.jl")
        @test try
            include(file); false
        catch e
            @test e isa SystemError
            @test e.prefix == "opening file $(repr(file))"
            true
        end
        touch(file)
        @test include_dependency(file) === nothing
        chmod(file, 0x000)

        # same for include_dependency: #52063
        dir = mktempdir() do dir
            @test include_dependency(dir) === nothing
            dir
        end
        @test try
            include_dependency(dir); false
        catch e
            @test e isa SystemError
            @test e.prefix == "opening file or folder $(repr(dir))"
            true
        end
    end
end

@testset "-m" begin
    rot13proj = joinpath(@__DIR__, "project", "Rot13")
    @test readchomp(`$(Base.julia_cmd()) --startup-file=no --project=$rot13proj -m Rot13 --project nowhere ABJURER`) == "--cebwrpg abjurer NOWHERE "
    @test readchomp(`$(Base.julia_cmd()) --startup-file=no --project=$rot13proj -m Rot13.Rot26 --project nowhere ABJURER`) == "--project nowhere ABJURER "
end

@testset "workspace loading" begin
   old_load_path = copy(LOAD_PATH)
   try
       empty!(LOAD_PATH)
       push!(LOAD_PATH, joinpath(@__DIR__, "project", "SubProject"))
       @test Base.get_preferences()["value"] == 1
       @test Base.get_preferences()["x"] == 1

       empty!(LOAD_PATH)
       push!(LOAD_PATH, joinpath(@__DIR__, "project", "SubProject", "sub"))
       id = Base.identify_package("Devved")
       @test isfile(Base.locate_package(id))
       @test Base.identify_package("Devved2") === nothing
       id3 = Base.identify_package("MyPkg")
       @test isfile(Base.locate_package(id3))

       empty!(LOAD_PATH)
       push!(LOAD_PATH, joinpath(@__DIR__, "project", "SubProject", "PackageThatIsSub"))
       id_pkg = Base.identify_package("PackageThatIsSub")
       @test Base.identify_package(id_pkg, "Devved") === nothing
       id_dev2 = Base.identify_package(id_pkg, "Devved2")
       @test isfile(Base.locate_package(id_dev2))
       id_mypkg = Base.identify_package("MyPkg")
       @test isfile(Base.locate_package(id_mypkg))
       id_dev = Base.identify_package(id_mypkg, "Devved")
       @test isfile(Base.locate_package(id_dev))
       @test Base.get_preferences()["value"] == 2
       @test Base.get_preferences()["x"] == 1
       @test Base.get_preferences()["y"] == 2

       empty!(LOAD_PATH)
       push!(LOAD_PATH, joinpath(@__DIR__, "project", "SubProject", "PackageThatIsSub", "test"))
       id_pkg = Base.identify_package("PackageThatIsSub")
       @test isfile(Base.locate_package(id_pkg))
       @test Base.identify_package(id_pkg, "Devved") === nothing
       id_dev2 = Base.identify_package(id_pkg, "Devved2")
       @test isfile(Base.locate_package(id_dev2))
       id_mypkg = Base.identify_package("MyPkg")
       @test isfile(Base.locate_package(id_mypkg))
       id_dev = Base.identify_package(id_mypkg, "Devved")
       @test isfile(Base.locate_package(id_dev))
       @test Base.get_preferences()["value"] == 3
       @test Base.get_preferences()["x"] == 1
       @test Base.get_preferences()["y"] == 2
       @test Base.get_preferences()["z"] == 3

       empty!(LOAD_PATH)
       push!(LOAD_PATH, joinpath(@__DIR__, "project", "SubProject", "test"))
       id_mypkg = Base.identify_package("MyPkg")
       id_dev = Base.identify_package(id_mypkg, "Devved")
       @test isfile(Base.locate_package(id_dev))
       @test Base.identify_package("Devved2") === nothing

    finally
       copy!(LOAD_PATH, old_load_path)
    end
end

@testset "project path handling" begin
    old_load_path = copy(LOAD_PATH)
    try
        push!(LOAD_PATH, joinpath(@__DIR__, "project", "ProjectPath"))
        id_project = Base.identify_package("ProjectPath")
        Base.locate_package(id_project)
        @test Base.locate_package(id_project) == joinpath(@__DIR__, "project", "ProjectPath", "CustomPath.jl")

        id_dep = Base.identify_package("ProjectPathDep")
        @test Base.locate_package(id_dep) == joinpath(@__DIR__, "project", "ProjectPath", "ProjectPathDep", "CustomPath.jl")
    finally
        copy!(LOAD_PATH, old_load_path)
    end
end

@testset "extension path computation name collision" begin
    old_load_path = copy(LOAD_PATH)
    try
        empty!(LOAD_PATH)
        push!(LOAD_PATH, joinpath(@__DIR__, "project", "Extensions", "ExtNameCollision_A"))
        push!(LOAD_PATH, joinpath(@__DIR__, "project", "Extensions", "ExtNameCollision_B"))
        ext_B = Base.PkgId(Base.uuid5(Base.identify_package("ExtNameCollision_B").uuid, "REPLExt"), "REPLExt")
        @test Base.locate_package(ext_B) == joinpath(@__DIR__, "project",  "Extensions", "ExtNameCollision_B", "ext", "REPLExt.jl")
    finally
        copy!(LOAD_PATH, old_load_path)
    end
end

@testset "require_stdlib loading duplication" begin
    depot_path = mktempdir()
    oldBase64 = nothing
    try
        push!(empty!(DEPOT_PATH), depot_path)
        Base64_key = Base.PkgId(Base.UUID("2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"), "Base64")
        oldBase64 = Base.unreference_module(Base64_key)
        cc = Base.compilecache(Base64_key)
        @test Base.isprecompiled(Base64_key, cachepaths=String[cc[1]])
        empty!(DEPOT_PATH)
        Base.require_stdlib(Base64_key)
        push!(DEPOT_PATH, depot_path)
        append!(DEPOT_PATH, original_depot_path)
        oldloaded = @lock(Base.require_lock, length(get(Base.loaded_precompiles, Base64_key, Module[])))
        Base.require(Base64_key)
        @test @lock(Base.require_lock, length(get(Base.loaded_precompiles, Base64_key, Module[]))) == oldloaded
        Base.unreference_module(Base64_key)
        empty!(DEPOT_PATH)
        push!(DEPOT_PATH, depot_path)
        Base.require(Base64_key)
        @test @lock(Base.require_lock, length(get(Base.loaded_precompiles, Base64_key, Module[]))) == oldloaded + 1
        Base.unreference_module(Base64_key)
    finally
        oldBase64 === nothing || Base.register_root_module(oldBase64)
        copy!(DEPOT_PATH, original_depot_path)
        rm(depot_path, force=true, recursive=true)
    end
end
