Test case: add a test case for Pull request danrevah#228

Author: rahuldimri

src/ng-pipes/pipes/date/time-ago.spec.ts

@@ -44,6 +44,9 @@ describe('TimeAgoPipe', () => {
 
   const fewYearsAgoString = 5 + ' years ago';
   const fewYearsAgoDate = new Date(new Date().setDate(new Date().getDate() - 365 * 5));
+  
+  const invalidDateMessage = "Invalid date";
+  const invalidDateStr = "2022-02-21T019Z";
 
   beforeAll(() => {
     pipe = new TimeAgoPipe();
@@ -116,4 +119,9 @@ describe('TimeAgoPipe', () => {
   it('should support moment.js last week', () => {
     expect(pipe.transform(moment().subtract(10, 'days'))).toEqual('last week');
   });
+  
+  
+  it('should throw invalid date for incorrect date string', () => {
+    expect(pipe.transform(invalidDateStr)).toEqual(invalidDateMessage);
+  });
 });