Added examples for the @RestClientTest article, fixed mail port (#513)

spring-boot/src/test/java/org/baeldung/SpringBootMailTest.java

@@ -37,7 +37,7 @@ public class SpringBootMailTest {
 
     @Before
     public void setUp() throws Exception {
-        final int TEST_PORT = 25;
+        final int TEST_PORT = 8025;
         wiser = new Wiser(TEST_PORT);
         wiser.start();
     }

spring-boot/src/test/java/org/baeldung/client/DetailsServiceClientTest.java

@@ -0,0 +1,47 @@
+package org.baeldung.client;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.client.RestClientTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.client.MockRestServiceServer;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.client.match.MockRestRequestMatchers.requestTo;
+import static org.springframework.test.web.client.response.MockRestResponseCreators.withSuccess;
+
+@RunWith(SpringRunner.class)
+@RestClientTest(DetailsServiceClient.class)
+public class DetailsServiceClientTest {
+
+    @Autowired
+    private DetailsServiceClient client;
+
+    @Autowired
+    private MockRestServiceServer server;
+
+    @Autowired
+    private ObjectMapper objectMapper;
+
+    @Before
+    public void setUp() throws Exception {
+        String detailsString = objectMapper.writeValueAsString(new Details("John Smith", "john"));
+        this.server.expect(requestTo("/john/details"))
+                .andRespond(withSuccess(detailsString, MediaType.APPLICATION_JSON));
+    }
+
+    @Test
+    public void whenCallingGetUserDetails_thenClientExecutesCorrectCall() throws Exception {
+
+        Details details = this.client.getUserDetails("john");
+
+        assertThat(details.getLogin()).isEqualTo("john");
+        assertThat(details.getName()).isEqualTo("John Smith");
+
+    }
+
+}

spring-boot/src/test/resources/application.properties

@@ -1,3 +1,3 @@
 spring.mail.host=localhost
-spring.mail.port=25
+spring.mail.port=8025
 spring.mail.properties.mail.smtp.auth=false