feat(test_lib): change test_lib.dart to structurally compare objects

modules/test_lib/src/test_lib.dart

@@ -15,11 +15,20 @@ Expect expect(actual, [matcher]) {
 class Expect extends gns.Expect {
   Expect(actual) : super(actual);
 
+  NotExpect get not => new NotExpect(actual);
+
+  void toEqual(expected) => toHaveSameProps(expected);
   void toThrowError([message=""]) => this.toThrowWith(message: message);
   void toBePromise() => _expect(actual is Future, equals(true));
   Function get _expect => gns.guinness.matchers.expect;
 }
 
+class NotExpect extends gns.NotExpect {
+  NotExpect(actual) : super(actual);
+
+  void toEqual(expected) => toHaveSameProps(expected);
+}
+
 it(name, fn) {
   gns.it(name, _handleAsync(fn));
 }