tests(core): add date-extensions.spec

npm/ng-packs/packages/core/src/lib/tests/date-extensions.spec.ts

@@ -0,0 +1,17 @@
+import '../utils/date-extensions';
+
+describe('DateExtensions', () => {
+  describe('#toLocalISOString', () => {
+    test('should able to use as date prototype', () => {
+      new Date().toLocalISOString();
+    });
+
+    test('should return correct value', () => {
+      const now = new Date();
+      const timezoneOffset = now.getTimezoneOffset();
+      expect(now.toLocalISOString()).toEqual(
+        new Date(now.getTime() - timezoneOffset * 60000).toISOString(),
+      );
+    });
+  });
+});