gotools/internal/testfiles/testfiles.go

// CopyToTmp copies the files and directories in src to a new temporary testing
// directory dst, and returns dst on success.
//
// After copying the files, it processes each of the 'old,new,' rename
// directives in order. Each rename directive moves the relative path "old"
// to the relative path "new" within the directory.
//
// Renaming allows tests to hide files whose names have
// special meaning, such as "go.mod" files or "testdata" directories
// from the go command, or ill-formed Go source files from gofmt.
//
// For example if we copy the directory testdata:
//
//	testdata/
//	    go.mod.test
//	    a/a.go
//	    b/b.go
//
// with the rename "go.mod.test,go.mod", the resulting files will be:
//
//	dst/
//	    go.mod
//	    a/a.go
//	    b/b.go
func CopyToTmp(t testing.TB, src fs.FS, rename ...string) string { … }

// Copy the files in src to dst.
// Use os.CopyFS when 1.23 can be used in x/tools.
func copyFS(dstdir string, src fs.FS) error { … }

// ExtractTxtarFileToTmp read a txtar archive on a given path,
// extracts it to a temporary directory, and returns the
// temporary directory.
func ExtractTxtarFileToTmp(t testing.TB, file string) string { … }

// LoadPackages loads typed syntax for all packages that match the
// patterns, interpreted relative to the archive root.
//
// The packages must be error-free.
func LoadPackages(t testing.TB, ar *txtar.Archive, patterns ...string) []*packages.Package { … }