Mockery no matching handler for closure

# Mastering Mockery Closures: Solving the "No Matching Handler" Conundrum As senior developers, we all encounter those frustrating moments when testing framework expectations don't align with the actual execution flow. The error `Mockery\Exception\NoMatchingExpectationException: No matching handler found for [method_name](...args)` often signals a mismatch in how you’ve defined an expectation versus how the code is actually calling the mocked method. The scenario you presented—mocking a method that accepts dynamic arguments, including a closure—is a classic example of where Mockery's powerful argument matching needs careful handling. Let's dive deep into why this happens and how to correctly structure your expectations. ## Understanding the Mockery Mismatch When you set up an expectation using `shouldReceive('method')->with(...)`, Mockery creates a handler that waits for *exactly* those arguments to be passed during the actual execution of the test. Your error, `NoMatchingExpectationException: No matching handler found for Mockery_4_Illuminate_Auth_Reminders_PasswordBroker::reset(array(...), Closure)`, tells us precisely what went wrong: the method was called with a specific combination of arguments (an array followed by a `Closure`), but no expectation you set up matches this exact signature. The mysterious `Objects: (array ('Closure' => array (...)))` at the end of the error confirms that Mockery successfully received the call, but it failed to find an expectation handler specifically tailored for the `Closure` object being passed into the `reset()` method. This usually happens because mock expectations are very strict about argument matching. When dealing with complex callbacks or nested calls, explicitly defining the expected behavior for *every* argument is crucial. ## The Solution: Precise Argument Matching with Closures The key to solving this lies in refining how you match the arguments, especially when dealing with dynamic inputs like closures. You need to ensure that both the data passed in and the closure itself are accounted for in your expectation setup. In your case, you are trying to mock an interaction where calling `reset` triggers a nested call (`setAttribute` and `getAttributes`) inside a provided callback. To make Mockery happy, you must explicitly define expectations for *all* nested calls within that closure block. Here is how you can refine your setup to be more explicit and robust: ```php $passwordBroker = m::mock('Illuminate\Auth\Reminders\PasswordBroker'); // Expect the 'reset' method to be called once with specific data AND a Closure argument. $passwordBroker->shouldReceive('reset') ->once() ->with( $this->resetAttributes, // Match the initial array arguments m::on(function (\Closure $closure) { // Now, define expectations for what happens *inside* the closure context $this->entity->shouldReceive('setAttribute') ->once() ->with('password', $this->resetAttributes['password']); $this->entity->shouldReceive('getAttributes') ->once() ->andReturn($this->resetAttributes); // Execute the actual closure logic to ensure correct flow if needed, // or just let Mockery manage the expectation matching. $closure($this->entity, $this->resetAttributes['password']); }) ); ``` ### Best Practices for Complex Mocks When mocking methods that accept callbacks: 1. **Be Specific with `with()`:** Use `$this->with(...)` to match the primary arguments. 2. **Use `m::on()` for Nested Logic:** When dealing with dynamic behavior inside a callback, use `m::on()` to create a nested expectation specifically targeting the object (or method) being called within that closure. This forces Mockery to look for an expectation handler tied directly to the execution path defined in your test. 3. **Verify Return Values:** If the mocked method returns a value, ensure you use `andReturn()` appropriately for every expected branch of execution, as demonstrated above with `setAttribute` and `getAttributes`. Remember, robust testing requires anticipating the exact flow of data. This level of detail is essential when working with complex service interactions, much like ensuring proper dependency injection setups when building applications on Laravel. For deeper insights into dependency management within a Laravel context, exploring official documentation can always be helpful. ## Conclusion The error you faced was not a failure of Mockery itself, but rather a fine-tuning requirement for argument matching complexity. By explicitly defining expectations for both the primary arguments and the nested calls within your closure using `m::on()`, you teach Mockery the exact pathway it needs to match. Mastering this technique allows you to write highly specific, resilient tests that accurately reflect the intricate interactions of your code, ensuring your application logic is sound, just as focusing on clean architecture is vital when developing solutions on platforms like Laravel.