diff --git a/pkgs/checks/test/extensions/function_test.dart b/pkgs/checks/test/extensions/function_test.dart
new file mode 100644
index 0000000..1331d41
--- /dev/null
+++ b/pkgs/checks/test/extensions/function_test.dart
@@ -0,0 +1,28 @@
+// 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() {
+  test('throws', () {
+    checkThat(() => throw StateError('oops!')).throws<StateError>();
+
+    checkThat(
+      softCheck<void Function()>(() {}, (p0) => p0.throws<StateError>()),
+    ).isARejection(actual: 'Returned <null>', which: ['Did not throw']);
+    checkThat(
+      softCheck<void Function()>(
+        () => throw StateError('oops!'),
+        (p0) => p0.throws<ArgumentError>(),
+      ),
+    ).isARejection(
+      actual: 'Completed to error Bad state: oops!',
+      which: ['Is not an ArgumentError'],
+    );
+  });
+}