QuarkusComponentTest: add better test for InjectMock and built-in Event

Author: mkouba

test-framework/junit5-component/src/test/java/io/quarkus/test/component/declarative/MockInjectedEventTest.java

@@ -0,0 +1,50 @@
+package io.quarkus.test.component.declarative;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+import jakarta.enterprise.context.ApplicationScoped;
+import jakarta.enterprise.event.Event;
+import jakarta.inject.Inject;
+
+import org.junit.jupiter.api.Test;
+import org.mockito.ArgumentMatchers;
+import org.mockito.Mockito;
+
+import io.quarkus.test.InjectMock;
+import io.quarkus.test.component.QuarkusComponentTest;
+
+@QuarkusComponentTest
+public class MockInjectedEventTest {
+
+    @Inject
+    Emitter emitter;
+
+    @InjectMock
+    Event<AtomicInteger> event;
+
+    @Test
+    public void testEvent() {
+        emitter.register();
+        emitter.register();
+        assertEquals(2, Emitter.COUNTER.get());
+        Mockito.verify(event, Mockito.times(2)).fire(ArgumentMatchers.any());
+    }
+
+    @ApplicationScoped
+    public static class Emitter {
+
+        static final AtomicInteger COUNTER = new AtomicInteger();
+
+        @Inject
+        Event<AtomicInteger> event;
+
+        void register() {
+            COUNTER.incrementAndGet();
+            event.fire(new AtomicInteger());
+        }
+
+    }
+
+}