# Test that mod files with invalid or missing paths produce an error.

# Test that go list fails on a go.mod with no module declaration.
cd $WORK/gopath/src/mod
! go list .
stderr '^go: no module declaration in go.mod.\n\tRun ''go mod edit -module=example.com/mod'' to specify the module path.$'

# Test that go mod init in GOPATH doesn't add a module declaration
# with a path that can't possibly be a module path, because
# it isn't even a valid import path.
# The single quote and backtick are the only characters  we don't allow
# in checkModulePathLax, but is allowed in a Windows file name.
# TODO(matloob): choose a different character once
# module.CheckImportPath is laxened and replaces
# checkModulePathLax.
cd $WORK/'gopath/src/m''d'
! go mod init
stderr 'cannot determine module path'

# Test that a go.mod file is rejected when its module declaration has a path that can't
# possibly be a module path, because it isn't even a valid import path
cd $WORK/gopath/src/badname
! go list .
stderr 'invalid module path'

-- mod/go.mod --

-- mod/foo.go --
package foo

-- m'd/foo.go --
package mad

-- badname/go.mod --

module .\.

-- badname/foo.go --
package badname