# setup
env TESTGO_VERSION=go1.99rc1
env TESTGO_VERSION_SWITCH=switch

# go get go should use the latest Go 1.23
cp go.mod.orig go.mod
go get go
stderr '^go: upgraded go 1.21 => 1.23.9$'
grep 'go 1.23.9' go.mod
! grep toolchain go.mod

# go get go@1.23 should use the latest Go 1.23
cp go.mod.orig go.mod
go get go@1.23
stderr '^go: upgraded go 1.21 => 1.23.9$'
grep 'go 1.23.9' go.mod
! grep toolchain go.mod

# go get go@1.22 should use the latest Go 1.22
cp go.mod.orig go.mod
go get go@1.22
stderr '^go: upgraded go 1.21 => 1.22.9$'
grep 'go 1.22.9' go.mod
! grep toolchain1 go.mod

# go get go@patch should use the latest patch release
go get go@1.22.1
go get go@patch
stderr '^go: upgraded go 1.22.1 => 1.22.9$'
grep 'go 1.22.9' go.mod
! grep toolchain go.mod

# go get go@1.24 does NOT find the release candidate
cp go.mod.orig go.mod
! go get go@1.24
stderr '^go: go@1.24: no matching versions for query "1.24"$'

# go get go@1.24rc1 works
cp go.mod.orig go.mod
go get go@1.24rc1
stderr '^go: upgraded go 1.21 => 1.24rc1$'
grep 'go 1.24rc1' go.mod
! grep toolchain go.mod

# go get go@latest finds the latest Go 1.23
cp go.mod.orig go.mod
go get go@latest
stderr '^go: upgraded go 1.21 => 1.23.9$'
grep 'go 1.23.9' go.mod
! grep toolchain go.mod

# Again, with toolchains.

go get toolchain@go1.99rc1
stderr '^go: added toolchain go1.99rc1$'
grep 'go 1.23.9' go.mod
grep 'toolchain go1.99rc1' go.mod

# go get toolchain should find go1.999testmod.
go get toolchain
stderr '^go: upgraded toolchain go1.99rc1 => go1.999testmod$'
grep 'go 1.23.9' go.mod
grep 'toolchain go1.999testmod' go.mod

# go get toolchain@go1.23 should use the latest Go 1.23
go get toolchain@go1.23
stderr '^go: removed toolchain go1.999testmod$'
grep 'go 1.23.9' go.mod
! grep 'toolchain go1.23.9' go.mod  # implied

# go get toolchain@go1.22 should use the latest Go 1.22 and downgrade go.
go get toolchain@go1.22
stderr '^go: downgraded go 1.23.9 => 1.22.9$'
grep 'go 1.22.9' go.mod
! grep 'toolchain go1.22.9' go.mod # implied

# go get toolchain@patch should use the latest patch release
go get toolchain@go1.22.1
go get toolchain@patch
stderr '^go: added toolchain go1.22.9$'
grep 'go 1.22.1' go.mod
grep 'toolchain go1.22.9' go.mod
go get go@1.22.9 toolchain@none
grep 'go 1.22.9' go.mod
! grep 'toolchain go1.22.9' go.mod

# go get toolchain@go1.24 does NOT find the release candidate
! go get toolchain@go1.24
stderr '^go: toolchain@go1.24: no matching versions for query "go1.24"$'

# go get toolchain@go1.24rc1 works
go get toolchain@go1.24rc1
stderr '^go: added toolchain go1.24rc1$'
grep 'go 1.22.9' go.mod  # no longer implied
grep 'toolchain go1.24rc1' go.mod

# go get toolchain@latest finds go1.23.9.
cp go.mod.orig go.mod
go get toolchain@latest
stderr '^go: added toolchain go1.23.9$'
grep 'go 1.21' go.mod
grep 'toolchain go1.23.9' go.mod



# Bug fixes.

# go get go@garbage should fail but not crash
! go get go@garbage
! stderr panic
stderr '^go: invalid go version garbage$'

# go get go@go1.21.0 is OK - we silently correct to 1.21.0
go get go@1.19
go get go@go1.21.0
stderr '^go: upgraded go 1.19 => 1.21.0'

# go get toolchain@1.24rc1 is OK too.
go get toolchain@1.24rc1
stderr '^go: upgraded toolchain go1.23.9 => go1.24rc1$'

# go get go@1.21 should work if we are the Go 1.21 language version,
# even though there's no toolchain for it.
# (Older versions resolve to the latest release in that version, so for example
# go get go@1.20 might resolve to 1.20.9, but if we're the devel copy of
# Go 1.21, there's no release yet to resolve to, so we resolve to ourselves.)
env TESTGO_VERSION=go1.21
go get go@1.19 toolchain@none
go get go@1.21
grep 'go 1.21$' go.mod
! grep toolchain go.mod

-- go.mod.orig --
module m

go 1.21
