DATACMNS-753 - Added test case to see parsing of Sort is not considering defaults for empty parameter.

Related ticket: DATACMNS-408.
Original pull request: #138.

src/test/java/org/springframework/data/web/SortHandlerMethodArgumentResolverUnitTests.java

@@ -149,6 +149,21 @@ public class SortHandlerMethodArgumentResolverUnitTests extends SortDefaultUnitT
 		assertThat(resolveSort(request, PARAMETER), is(nullValue()));
 	}
 
+	/**
+	 *
+	 * @see DATACMNS-753
+	 * see also DATACMNS-408
+	 */
+	@Test
+	public void doesNotReturnNullWhenAnnotatedWithSortDefault() throws Exception {
+
+		MockHttpServletRequest request = new MockHttpServletRequest();
+		request.addParameter("sort", ""); //valid input
+
+		assertNotNull(resolveSort(request, getParameterOfMethod("simpleDefault")));
+		assertNotNull(resolveSort(request, getParameterOfMethod("containeredDefault")));
+	}
+
 	/**
 	 * @see DATACMNS-408
 	 */