Add doc: Asserting that actions and filters have been removed

docs/usage/mocking-wp-action-and-filter-hooks.md

@@ -140,4 +140,25 @@ final class MyClassTest extends TestCase
         $this->assertEquals('Default', (new MyClass())->filterContent());
     }
 }
-```
+```
+
+## Asserting that actions and filters have been removed
+
+Similarly, we can test that actions and filters are removed when expected, e.g.removing another plugin's admin notice. This is done using `WP_Mock::expectActionRemoved()` and `WP_Mock::expectFilterRemoved()`. Or conversely, we can confirm that they have _not_ been removed using `WP_Mock::expectActionNotRemoved()` and `WP_Mock::expectFilterNotRemoved()`. The latter functions are useful where a function being tested returns early in some scenarios, and we want to ensure that the hooks are not removed in that case.
+
+```php
+use MyPlugin\MyClass;
+use WP_Mock\Tools\TestCase as TestCase;
+
+final class MyClassTest extends TestCase
+{
+    public function testRemoveAction() : void 
+    {
+        $classInstance = new MyClass();
+
+        WP_Mock::expectActionRemoved('admin_notices', 'invasive_admin_notice');
+
+        $classInstance->removeInvasiveAdminNotice();
+    }
+}
+```