checks: add an example

pkgs/checks/CHANGELOG.md

@@ -1,3 +1,7 @@
+# 0.1.1-dev
+
+- Added an example.
+
 # 0.1.0
 
 -   Initial release.

pkgs/checks/example/example.dart

@@ -0,0 +1,23 @@
+// Copyright (c) 2023, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:checks/checks.dart';
+import 'package:test/scaffolding.dart';
+
+void main() {
+  test('sample test', () {
+    final someValue = 5;
+    checkThat(someValue).equals(5);
+
+    final someList = [1, 2, 3, 4, 5];
+    checkThat(someList).deepEquals([1, 2, 3, 4, 5]);
+
+    final someString = 'abcdefghijklmnopqrstuvwxyz';
+
+    checkThat(someString)
+      ..startsWith('a')
+      ..endsWith('z')
+      ..contains('lmno');
+  });
+}

pkgs/checks/pubspec.yaml

@@ -1,5 +1,5 @@
 name: checks
-version: 0.1.0
+version: 0.1.1-dev
 description: >-
   A framework for checking values against expectations and building custom
   expectations.