func CompareWithFixture()

in internal/testutil/golden.go [28:71]
41 lines of code
11 McCabe index (conditional complexity)

func CompareWithFixture(t *testing.T, output interface{}, opts ...option) {
	t.Helper()
	options := &options{
		Extension: ".yaml",
	}
	for _, opt := range opts {
		opt(options)
	}

	var serializedOutput []byte
	switch v := output.(type) {
	case []byte:
		serializedOutput = v
	case string:
		serializedOutput = []byte(v)
	default:
		serialized, err := yaml.Marshal(v)
		if err != nil {
			t.Fatalf("failed to yaml marshal output of type %T: %v", output, err)
		}
		serializedOutput = serialized
	}

	golden, err := golden(t, options)
	if err != nil {
		t.Fatalf("failed to get absolute path to testdata file: %v", err)
	}
	if os.Getenv("UPDATE") != "" {
		if err := os.MkdirAll(filepath.Dir(golden), 0755); err != nil {
			t.Fatalf("failed to create fixture directory: %v", err)
		}
		if err := os.WriteFile(golden, serializedOutput, 0644); err != nil {
			t.Fatalf("failed to write updated fixture: %v", err)
		}
	}
	expected, err := os.ReadFile(golden)
	if err != nil {
		t.Fatalf("failed to read testdata file: %v", err)
	}

	if diff := cmp.Diff(string(expected), string(serializedOutput)); diff != "" {
		t.Errorf("got diff between expected and actual result:\nfile: %s\ndiff:\n%s\n\nIf this is expected, re-run the test with `UPDATE=true go test ./...` to update the fixtures.", golden, diff)
	}
}