diff --git a/pkgs/checks/test/extensions/math_test.dart b/pkgs/checks/test/extensions/math_test.dart
new file mode 100644
index 0000000..a73e48b
--- /dev/null
+++ b/pkgs/checks/test/extensions/math_test.dart
@@ -0,0 +1,24 @@
+// Copyright (c) 2022, 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:checks/context.dart';
+import 'package:test/scaffolding.dart';
+
+import '../test_shared.dart';
+
+void main() {
+  group('NumChecks', () {
+    test('greater-than', () {
+      checkThat(42) > 7;
+      checkThat(softCheck<int>(42, (p0) => p0 > 50))
+          .isARejection(actual: '<42>', which: ['Is not greater than <50>']);
+    });
+    test('less-than', () {
+      checkThat(42) < 50;
+      checkThat(softCheck<int>(42, (p0) => p0 < 7))
+          .isARejection(actual: '<42>', which: ['Is not less than <7>']);
+    });
+  });
+}