adding new module

spring-5-reactive/src/test/java/com/baeldung/Spring5JUnit4ConcurrentIntegrationTest.java

@@ -0,0 +1,52 @@
+package com.baeldung;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.util.concurrent.TimeUnit;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+@RunWith(SpringRunner.class)
+@ContextConfiguration(classes = Spring5JUnit4ConcurrentIntegrationTest.SimpleConfiguration.class)
+public class Spring5JUnit4ConcurrentIntegrationTest implements ApplicationContextAware, InitializingBean {
+
+    @Configuration
+    public static class SimpleConfiguration {
+    }
+
+    private ApplicationContext applicationContext;
+
+    private boolean beanInitialized = false;
+
+    @Override
+    public final void afterPropertiesSet() throws Exception {
+        this.beanInitialized = true;
+    }
+
+    @Override
+    public final void setApplicationContext(final ApplicationContext applicationContext) throws BeansException {
+        this.applicationContext = applicationContext;
+    }
+
+    @Test
+    public final void verifyApplicationContextSet() throws InterruptedException {
+        TimeUnit.SECONDS.sleep(2);
+        assertNotNull("The application context should have been set due to ApplicationContextAware semantics.", this.applicationContext);
+    }
+
+    @Test
+    public final void verifyBeanInitialized() throws InterruptedException {
+        TimeUnit.SECONDS.sleep(2);
+        assertTrue("This test bean should have been initialized due to InitializingBean semantics.", this.beanInitialized);
+    }
+
+}