@Test
public void testConvertChild_stringToString() throws Exception {

    ExpressionEvaluator eval = mock(ExpressionEvaluator.class);
    when(eval.evaluate(anyString())).thenAnswer(call -> call.getArgument(0, String.class));
    assertEquals("expect json string", JavaxJson.wrap("bar"),
            converter().convertChild(xml("fooBar.xml"), eval));
}