# 'go mod init' should not recommend 'go mod tidy' in an empty directory
# (one that contains no non-hidden .go files or subdirectories).
cd empty
go mod init m
! stderr tidy
cd ..

# 'go mod init' should recommend 'go mod tidy' if the directory has a .go file.
cd pkginroot
go mod init m
stderr '^go: run ''go mod tidy'' to add module requirements and sums$'
cd ..

# 'go mod init' should recommend 'go mod tidy' if the directory has a
# subdirectory. We don't walk the tree to see if it has .go files.
cd subdir
go mod init m
stderr '^go: run ''go mod tidy'' to add module requirements and sums$'
cd ..

-- empty/empty.txt --
Not a .go file. Still counts as an empty project.
-- empty/.hidden/empty.go --
File in hidden directory. Still as an empty project.
-- empty/_hidden/empty.go --
File in hidden directory. Still as an empty project.
-- pkginroot/hello.go --
package vendorimport
-- subdir/sub/empty.txt --
Subdirectory doesn't need to contain a package.