### Question:
StringType implements ArgumentType<String> { public String toObject(String value) { if (StringUtil.isEmpty(value)) { return null; } return ArgumentUtil.decode(value); }  String toObject(String value); String toText(String value);  }### Answer:
@Test public void testToObject() { assertEquals("aaa", stringType.toObject("'aaa'")); }
@Test public void testToObject_empty() { assertEquals("", stringType.toObject("''")); }