anchor.diff:        // Only execute the check below once. `Invoker.current` may look like a
         // cheap getter, but it involves Zones and casting.
         _testApiMismatchHasBeenChecked = true;
  -      _checkTestApiMismatch();
       }
       expect(callCount, wrapMatcher(matcher),
           reason: 'Unexpected number of calls');
  
positive.code: import 'package:test_api/fake.dart';
  // ignore: deprecated_member_use
  import 'package:test_api/test_api.dart';
  // TODO(srawlins): Remove this when we no longer need to check for an
  // incompatiblity between test_api and test.
  // https://github.com/dart-lang/mockito/issues/175
  import 'package:test_api/src/backend/invoker.dart';
  
  /// Whether a [when] call is "in progress."
  ///
  
negative.code: 
    VerificationResult._(this.callCount, this._captured);
  
    /// Assert that the number of calls matches [matcher].
    ///
    /// Examples:
  