Fix documentation

Author: Arkalo2

src/LiveComponent/doc/index.rst

@@ -3782,9 +3782,10 @@ uses Symfony's test client to render and make requests to your components::
             ;
 
             // Assert that the event was emitted
-            $this->componentHasEmittedEvent($render, 'increaseEvent', [
-                'amount' => 2,
-            ]);
+            $this->componentHasEmittedEvent($testComponent->render(), 'increaseEvent')
+                ->withData(['amount' => 2])
+                ->withDataSubset(['amount' => 2]) // test partial parameters
+            ;
 
             // set live props
             $testComponent

src/LiveComponent/src/Test/InteractsWithLiveComponents.php

@@ -45,6 +45,9 @@ protected function createLiveComponent(string $name, array $data = [], ?KernelBr
         );
     }
 
+    /**
+     * @return object{withData: callable(array): object, withDataSubset: callable(array): object}
+     */
     protected function assertComponentEmitEvent(TestLiveComponent $testLiveComponent, string $expectedEventName): object
     {
         $event = $testLiveComponent->getEmittedEvent($testLiveComponent->render(), $expectedEventName);
@@ -59,7 +62,10 @@ public function __construct(private KernelTestCase $parent, private readonly str
             {
             }
 
-            public function withDataSubset(array $expectedEventData): void
+            /**
+             * @return self
+             */
+            public function withDataSubset(array $expectedEventData): object
             {
                 foreach ($expectedEventData as $key => $value) {
                     $this->parent->assertArrayHasKey($key, $this->data, \sprintf('The expected event "%s" data "%s" does not exists', $this->eventName, $key));
@@ -75,11 +81,18 @@ public function withDataSubset(array $expectedEventData): void
                         )
                     );
                 }
+
+                return $this;
             }
 
-            public function withData(array $expectedEventData): void
+            /**
+             * @return self
+             */
+            public function withData(array $expectedEventData): object
             {
                 $this->parent->assertEquals($expectedEventData, $this->data, \sprintf('The expected event "%s" data does not match.', $this->eventName));
+
+                return $this;
             }
         };
     }

src/LiveComponent/tests/Functional/Test/InteractsWithLiveComponentsTest.php

@@ -250,9 +250,10 @@ public function testComponentEmitsExpectedPartialEventData(): void
 
         $testComponent->call('actionThatEmits');
 
-        $this->assertComponentEmitEvent($testComponent, 'event1')->withDataSubset([
-            'foo' => 'bar',
-        ]);
+        $this->assertComponentEmitEvent($testComponent, 'event1')
+            ->withDataSubset(['foo' => 'bar'])
+            ->withDataSubset(['bar' => 'foo'])
+        ;
     }
 
     public function testComponentDoesNotEmitUnexpectedEvent(): void