BAEL-859 How to display/list all Spring-managed beans? (#2021)

* Display all beans in Spring Container

* Display all spring managed beans

Add code to configure 'beans' endpoint.

* Added 'spring-boot-starter-test' dependency

Added 'spring-boot-starter-test' dependency with scope 'test'

* Display all spring managed beans Test cases

Added test cases for 'Display all spring managed beans' module.

spring-boot/src/test/java/com/baeldung/displayallbeans/DisplayBeanIntegrationTest.java

@@ -0,0 +1,84 @@
+package com.baeldung.displayallbeans;
+
+import static org.assertj.core.api.BDDAssertions.then;
+import static org.hamcrest.CoreMatchers.hasItem;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.context.embedded.LocalServerPort;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.context.TestPropertySource;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.web.context.WebApplicationContext;
+
+import com.baeldung.displayallbeans.Application;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = Application.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+@TestPropertySource(properties = {"management.port=0", "endpoints.beans.id=springbeans", "endpoints.beans.sensitive=false"})
+public class DisplayBeanIntegrationTest {
+
+    @LocalServerPort
+    private int port;
+
+    @Value("${local.management.port}")
+    private int mgt;
+
+    @Autowired
+    private TestRestTemplate testRestTemplate;
+
+    @Autowired
+    private WebApplicationContext context;
+
+    @Test
+    public void givenRestTemplate_whenAccessServerUrl_thenHttpStatusOK() throws Exception {
+        @SuppressWarnings("rawtypes")
+        ResponseEntity<Map> entity = this.testRestTemplate.getForEntity(
+          "http://localhost:" + this.port + "/getPerson", Map.class);
+        
+        then(entity.getStatusCode()).isEqualTo(HttpStatus.OK);
+    }
+    
+    @Test
+    public void givenRestTemplate_whenAccessEndpointUrl_thenHttpStatusOK() throws Exception {
+        @SuppressWarnings("rawtypes")
+        ResponseEntity<List> entity = this.testRestTemplate.getForEntity(
+          "http://localhost:" + this.mgt + "/springbeans", List.class);
+
+        then(entity.getStatusCode()).isEqualTo(HttpStatus.OK);
+    }
+
+    @Test
+    public void givenRestTemplate_whenAccessEndpointUrl_thenReturnsBeanNames() throws Exception {
+        @SuppressWarnings("rawtypes")
+        ResponseEntity<List> entity = this.testRestTemplate.getForEntity(
+          "http://localhost:" + this.mgt + "/springbeans", List.class);
+
+        List<Map<String, Object>> allBeans = (List) ((Map) entity.getBody().get(0)).get("beans");
+        List<String> beanNamesList = allBeans.stream().map(x -> (String) x.get("bean")).collect(Collectors.toList());
+
+        assertThat( beanNamesList, hasItem("personController"));
+        assertThat( beanNamesList, hasItem("person"));
+    }
+    
+    @Test
+    public void givenWebApplicationContext_whenAccessGetBeanDefinitionNames_thenReturnsBeanNames() throws Exception {
+        String[] beanNames = context.getBeanDefinitionNames();
+        
+        List<String> beanNamesList = Arrays.asList(beanNames);
+        assertTrue(beanNamesList.contains("personController"));
+        assertTrue(beanNamesList.contains("person"));
+    }
+}