if len(r.diffTree) == 0 {
		return ""
	}
	y, err := yaml.Marshal(r.diffTree)
	if err != nil {
		return err.Error()
	}
	return string(y)
}

// YAMLCmp compares two yaml texts, return a tree based diff text.
func YAMLCmp(a, b string) string {
	return YAMLCmpWithIgnore(a, b, nil, "")
}

// YAMLCmpWithIgnore compares two yaml texts, and ignores paths in ignorePaths.

  labels:
    '[3->?]': label4 -> <empty> (REMOVED)
    '[4->?]': label5 -> <empty> (REMOVED)
`,
		},
	}
	for _, tt := range tests {
		t.Run(tt.desc, func(t *testing.T) {
			if got, want := YAMLCmp(tt.a, tt.b), tt.want; !(got == want) {
				t.Errorf("%s: got:%v, want:%v", tt.desc, got, want)
			}
		})
	}
}

func TestYAMLCmpWithIgnore(t *testing.T) {
	tests := []struct {
		desc string

	got, err = compare.FilterManifest(got, diffSelect, "")
	if err != nil {
		t.Errorf("error selecting from output manifest: %v", err)
	}
	diff := compare.YAMLCmp(got, want)
	if diff != "" {
		t.Errorf("`manifest generate` diff = %s", diff)
	}
}

func TestBareSpec(t *testing.T) {
	inPathBase := filepath.Join(testDataDir, "input/bare_spec.yaml")