fix(built_value_test): respect non comparable fields

Signed-off-by: Nikolas Rimikis <leptopoda@users.noreply.github.com>

Author: Leptopoda

built_value_test/lib/matcher.dart

@@ -41,6 +41,8 @@ class _BuiltValueMatcher implements Matcher {
   bool matches(dynamic item, Map matchState) {
     if (_expected.runtimeType != item.runtimeType) return false;
 
+    if (_expected == item) return true;
+
     return _delegate.matches(_toMap(item), matchState);
   }
 }

built_value_test/test/matcher_test.dart

@@ -103,7 +103,7 @@ void main() {
         ..name = 'foo'
         ..onChanged = () => 'Change happened!');
 
-      expect(value, otherValue);
+      expect(value, equalsBuilt(otherValue));
     });
 
     test('compared value matcher with different onChanged outcomes', () {
@@ -114,7 +114,7 @@ void main() {
         ..name = 'foo'
         ..onChanged = () => 'Change did not happen!');
 
-      expect(value, otherValue);
+      expect(value, equalsBuilt(otherValue));
     });
 
     test('compared value matcher with different names', () {