} else {
					filenames = append(filenames, filename)
				}
			}
			got, err := readLayeredYAMLs(filenames, stdinReader)
			if (err != nil) != tt.wantErr {
				t.Errorf("ReadLayeredYAMLs() error = %v, wantErr %v", err, tt.wantErr)
				return
			}

			diff := util.YAMLDiff(got, want)
			if diff != "" {
				t.Errorf("ReadLayeredYAMLs() got:\n%s\nwant:\n%s\ndiff:\n%s", got, want, diff)
			}
		})
	}
}

	if fileOverlayIOP.Spec != nil && fileOverlayIOP.Spec.Profile != "" {
		profile = fileOverlayIOP.Spec.Profile
	}
	return y, profile, nil
}

func ReadLayeredYAMLs(filenames []string) (string, error) {
	return readLayeredYAMLs(filenames, os.Stdin)
}

func readLayeredYAMLs(filenames []string, stdinReader io.Reader) (string, error) {
	var ly string
	var stdin bool
	for _, fn := range filenames {
		var b []byte

func getIOPConfigs() (string, *meshconfig.MeshConfig, error) {
	var meshConfig *meshconfig.MeshConfig
	var valuesConfig string
	if iopFilename != "" {
		var iop *iopv1alpha1.IstioOperator
		y, err := manifest.ReadLayeredYAMLs([]string{iopFilename})
		if err != nil {
			return "", nil, err
		}
		iop, err = validate.UnmarshalIOP(y)
		if err != nil {
			return "", nil, err
		}
		if err := validate.ValidIOP(iop); err != nil {