@Test
public void testArgMismatch() {
expectedEx.expect(ConversionFailedException.class);
expectedEx.expectMessage(String.format(Message.CONV_ARG_MISMATCH.getString(),
Integer.class, String.class, StringNumberConverter.class));
cm.registerConverter(new StringNumberConverter());
String value = cm.convert(100, String.class, 0);
assertThat(value, is(notNullValue()));
assertThat(value, is("100"));
}