fix tests

 import 'package:flutter_test/flutter_test.dart';
 import 'package:get/get.dart';
+import 'util/matcher.dart';
 
 class Mock {
   static Future<String> test() async {
@@ -18,14 +19,6 @@ class DisposableController extends DisposableInterface {
   }
 }
 
-class TypeMatcher<T> {
-  /// Creates a type matcher for the given type parameter.
-  const TypeMatcher();
-
-  /// Returns true if the given object is of type `T`.
-  bool check(dynamic object) => object is T;
-}
-
 abstract class Service {
   String post();
 }

+import 'package:flutter_test/flutter_test.dart';
+
+// Copyright 2014, the Dart project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+class _FunctionMatcher<T> extends CustomMatcher {
+  final dynamic Function(T value) _feature;
+
+  _FunctionMatcher(String name, this._feature, matcher)
+      : super('`$name`:', '`$name`', matcher);
+
+  @override
+  Object featureValueOf(covariant T actual) => _feature(actual);
+}
+
+class HavingMatcher<T> implements TypeMatcher<T> {
+  final TypeMatcher<T> _parent;
+  final List<_FunctionMatcher<T>> _functionMatchers;
+
+  HavingMatcher(TypeMatcher<T> parent, String description,
+      Object Function(T) feature, dynamic matcher,
+      [Iterable<_FunctionMatcher<T>> existing])
+      : _parent = parent,
+        _functionMatchers = [
+          ...?existing,
+          _FunctionMatcher<T>(description, feature, matcher)
+        ];
+
+  @override
+  TypeMatcher<T> having(
+          Object Function(T) feature, String description, dynamic matcher) =>
+      HavingMatcher(_parent, description, feature, matcher, _functionMatchers);
+
+  @override
+  bool matches(item, Map matchState) {
+    for (var matcher in <Matcher>[_parent].followedBy(_functionMatchers)) {
+      if (!matcher.matches(item, matchState)) {
+        addStateInfo(matchState, {'matcher': matcher});
+        return false;
+      }
+    }
+    return true;
+  }
+
+  @override
+  Description describeMismatch(
+      item, Description mismatchDescription, Map matchState, bool verbose) {
+    var matcher = matchState['matcher'] as Matcher;
+    matcher.describeMismatch(
+        item, mismatchDescription, matchState['state'] as Map, verbose);
+    return mismatchDescription;
+  }
+
+  @override
+  Description describe(Description description) => description
+      .add('')
+      .addDescriptionOf(_parent)
+      .add(' with ')
+      .addAll('', ' and ', '', _functionMatchers);
+}
+
+class TypeMatcher<T> extends Matcher {
+  const TypeMatcher();
+
+  TypeMatcher<T> having(
+          Object Function(T) feature, String description, dynamic matcher) =>
+      HavingMatcher(this, description, feature, matcher);
+
+  @override
+  Description describe(Description description) {
+    var name = _stripDynamic(T);
+    return description.add("<Instance of '$name'>");
+  }
+
+  @override
+  bool matches(Object item, Map matchState) => item is T;
+
+  @override
+  Description describeMismatch(
+      item, Description mismatchDescription, Map matchState, bool verbose) {
+    var name = _stripDynamic(T);
+    return mismatchDescription.add("is not an instance of '$name'");
+  }
+}
+
+String _stripDynamic(Type type) =>
+    type.toString().replaceAll(_dart2DynamicArgs, '');
+final _dart2DynamicArgs = RegExp('<dynamic(, dynamic)*>');