in internal/testutil/golden.go [15:22]
func CompareFileWithFixture(t *testing.T, outputFile string, opts ...option) {
t.Helper()
raw, err := os.ReadFile(outputFile)
if err != nil {
t.Fatalf("failed to read output: %v", err)
}
CompareWithFixture(t, raw, append(opts, WithExtension(filepath.Ext(outputFile)))...)
}