&MarshalerError{st, fmt.Errorf(errText), ""},
		"json: error calling MarshalJSON for type " + st.String() + ": " + errText,
	}, {
		Name(""),
		&MarshalerError{st, fmt.Errorf(errText), "TestMarshalerError"},
		"json: error calling TestMarshalerError for type " + st.String() + ": " + errText,
	}}

	for _, tt := range tests {
		t.Run(tt.Name, func(t *testing.T) {
			got := tt.err.Error()
			if got != tt.want {