@Test
public void testUseCustomMessage() throws Exception {

	final Field annotatedElement = this.getClass().getDeclaredField("t1_str");
	final Annotation annotation = annotatedElement.getAnnotation(NotNull.class);
	final Map<String, Object> actual = this.testee.generateFrom(annotatedElement, annotation);
	Assert.assertEquals("Enter a value for t1_str", actual.get("message"));
}