Allow asserting has errors on custom validator errors

src/Testing/Concerns/MakesAssertions.php

@@ -189,7 +189,9 @@ public function assertDispatchedBrowserEvent($name, $data = null)
 
     public function assertHasErrors($keys = [])
     {
-        $errors = new MessageBag($this->payload['serverMemo']['errors'] ?: []);
+        $errors = new MessageBag(
+            $this->lastValidator->errors()->messages()
+        );
 
         PHPUnit::assertTrue($errors->isNotEmpty(), 'Component has no errors.');
 
@@ -213,7 +215,9 @@ public function assertHasErrors($keys = [])
 
     public function assertHasNoErrors($keys = [])
     {
-        $errors = new MessageBag($this->payload['serverMemo']['errors'] ?? []);
+        $errors = new MessageBag(
+            $this->lastValidator ? $this->lastValidator->errors()->messages() : []
+        );
 
         if (empty($keys)) {
             PHPUnit::assertTrue($errors->isEmpty(), 'Component has errors: "' . implode('", "', $errors->keys()) . '"');

src/Testing/TestableLivewire.php

@@ -40,6 +40,12 @@ public function __construct($name, $params = [])
             $this->lastValidator = $validator;
         });
 
+        Livewire::listen('component.hydrate.subsequent', function ($validator) {
+            // Clear the validator held in memory from the last request so we
+            // can properly assert validation errors for the most recent request.
+            $this->lastValidator = null;
+        });
+
         Livewire::listen('component.dehydrate', function($component) {
             static::$instancesById[$component->id] = $component;
         });

tests/Unit/ValidationTest.php

@@ -362,6 +362,14 @@ public function only_data_in_validation_rules_is_returned()
             'bar' => $component->bar,
         ], $validatedData);
     }
+
+    /** @test */
+    public function can_assert_validation_errors_on_errors_thrown_from_custom_validator()
+    {
+        $component = Livewire::test(ForValidation::class);
+
+        $component->call('failFooOnCustomValidator')->assertHasErrors('plop');
+    }
 }
 
 class ForValidation extends Component
@@ -508,6 +516,11 @@ public function runValidationWithoutAllPublicPropertiesAndReturnValidatedData()
         return $this->validate(['bar' => 'required']);
     }
 
+    public function failFooOnCustomValidator()
+    {
+        Validator::make([], ['plop' => 'required'])->validate();
+    }
+
     public function render()
     {
         return app('view')->make('dump-errors');