bug #1113 fix(live): fix testing events (kbond)

This PR was merged into the 2.x branch.

Discussion
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fix(live): fix testing events

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Tickets       | Fix #1110
| License       | MIT

When implementing #823, I made the wrong assumption that events were identical to actions. This fixes that.

Commits
-------

3bb139b fix(live): fix testing events

Author: weaverryan

src/LiveComponent/src/Test/TestLiveComponent.php

@@ -15,6 +15,7 @@
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 use Symfony\Component\Security\Core\User\UserInterface;
+use Symfony\UX\LiveComponent\Attribute\AsLiveComponent;
 use Symfony\UX\LiveComponent\LiveComponentHydrator;
 use Symfony\UX\LiveComponent\Metadata\LiveComponentMetadataFactory;
 use Symfony\UX\TwigComponent\ComponentFactory;
@@ -100,7 +101,24 @@ public function call(string $action, array $arguments = []): self
      */
     public function emit(string $event, array $arguments = []): self
     {
-        return $this->call($event, $arguments);
+        $listeners = AsLiveComponent::liveListeners($this->component());
+        $actions = [];
+
+        foreach ($listeners as $listener) {
+            if ($listener['event'] === $event) {
+                $actions[] = ['name' => $listener['action'], 'args' => $arguments];
+            }
+        }
+
+        if (!$actions) {
+            throw new \InvalidArgumentException(sprintf('Event "%s" does not exist on component "%s".', $event, $this->metadata->getName()));
+        }
+
+        if (1 === \count($listeners)) {
+            return $this->call($actions[0]['name'], $arguments);
+        }
+
+        return $this->request(['actions' => $actions], '_batch');
     }
 
     public function set(string $prop, mixed $value): self

src/LiveComponent/tests/Fixtures/Component/Component2.php

@@ -14,6 +14,8 @@
 use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 use Symfony\UX\LiveComponent\Attribute\AsLiveComponent;
+use Symfony\UX\LiveComponent\Attribute\LiveArg;
+use Symfony\UX\LiveComponent\Attribute\LiveListener;
 use Symfony\UX\LiveComponent\Attribute\PreReRender;
 use Symfony\UX\LiveComponent\Attribute\LiveAction;
 use Symfony\UX\LiveComponent\Attribute\LiveProp;
@@ -51,6 +53,18 @@ public function redirect(UrlGeneratorInterface $urlGenerator): RedirectResponse
         return new RedirectResponse($urlGenerator->generate('homepage'), 302, ['X-Custom-Header' => '1']);
     }
 
+    #[LiveListener('triggerIncrease')]
+    public function increaseEvent1(#[LiveArg] int $amount = 1): void
+    {
+        $this->count += $amount;
+    }
+
+    #[LiveListener('triggerIncrease')]
+    public function increaseEvent2(#[LiveArg] int $amount = 1): void
+    {
+        $this->count += $amount;
+    }
+
     #[PreDehydrate]
     public function preDehydrateMethod(): void
     {

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

@@ -63,6 +63,28 @@ public function testCanCallLiveActionWithArguments(): void
         $this->assertSame(33.3, $testComponent->component()->arg3);
     }
 
+    public function testCanEmitEvent(): void
+    {
+        $testComponent = $this->createLiveComponent('component2');
+
+        $this->assertStringContainsString('Count: 1', $testComponent->render());
+        $this->assertSame(1, $testComponent->component()->count);
+
+        $testComponent->emit('triggerIncrease', ['amount' => 2]);
+
+        $this->assertStringContainsString('Count: 5', $testComponent->render());
+        $this->assertSame(5, $testComponent->component()->count);
+    }
+
+    public function testInvalidEventName(): void
+    {
+        $testComponent = $this->createLiveComponent('component2');
+
+        $this->expectException(\InvalidArgumentException::class);
+
+        $testComponent->emit('invalid');
+    }
+
     public function testCanSetLiveProp(): void
     {
         $testComponent = $this->createLiveComponent('component_with_writable_props');