gotools/go/ssa/testutil_test.go

// goMod returns a go.mod file containing a name and a go directive
// for the major version. If major < 0, use the current go toolchain
// version.
func goMod(name string, major int) []byte { … }

// overlayFS returns a simple in-memory filesystem.
func overlayFS(overlay map[string][]byte) fstest.MapFS { … }

// openTxtar opens a txtar file as a filesystem.
func openTxtar(t testing.TB, file string) fs.FS { … }

// loadPackages copies the files in a source file system to a unique temporary
// directory and loads packages matching the given patterns from the temporary directory.
//
// TODO(69556): Migrate loader tests to loadPackages.
func loadPackages(t testing.TB, src fs.FS, patterns ...string) []*packages.Package { … }

// buildPackage builds the content of a go file into:
// * a module with the same name as the package at the current go version,
// * loads the *package.Package,
// * checks that (*packages.Packages).Syntax contains one file,
// * builds the *ssa.Package (and not its dependencies), and
// * returns the built *ssa.Package and the loaded packages.Package.
//
// TODO(adonovan): factor with similar loadFile (2x) in cha/cha_test.go and vta/helpers_test.go.
func buildPackage(t testing.TB, content string, mode ssa.BuilderMode) (*ssa.Package, *packages.Package) { … }

// parsePackageClause is a test helper to extract the package name from a string
// containing the content of a go file.
func parsePackageClause(t testing.TB, content string) string { … }