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| <h1>Application Composer and Mockito example</h1> |
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| <div id="preamble"> |
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| <div class="paragraph"> |
| <p>In this example, a REST service will be tested, using Application Composer and Mockito.</p> |
| </div> |
| <div class="paragraph"> |
| <p><a href="http://tomee.apache.org/tomee-8.0/docs/application-composer/index.html">Application Composer</a> is a testing API for TomEE. It’s faster to bootstrap than Arquillian. <a href="https://site.mockito.org/">Mockito</a> is a mocking framework. Both will be used for testing a REST service.</p> |
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| </div> |
| <div class="sect1"> |
| <h2 id="_example">Example</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The REST service example is defined by the following class:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">@Singleton |
| @Path("/greeting") |
| public class GreetingService { |
| |
| @Inject |
| private Messager messager; |
| |
| @GET |
| public String message() { |
| return messager.message(); |
| } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>A bean, <code>messager</code>, is injected. When a client accesses the resource <code>GET /greeting</code>, the content returned to the client will be the result of <code>messager.message()</code> method execution.</p> |
| </div> |
| <div class="paragraph"> |
| <p><code>Messager</code> functionality is defined by this interface:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">public interface Messager { |
| |
| String message(); |
| }</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_testing_the_rest_service">Testing the REST service</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>For testing this REST service, Application Composer will be used in combination with Mockito:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">@RunWith(ApplicationComposer.class) |
| public class GreetingServiceTest { |
| |
| @Mock |
| private Messager messager; |
| |
| @Configuration |
| public Properties configuration() { |
| return new Properties() {{ |
| setProperty(OpenEjbContainer.OPENEJB_EMBEDDED_REMOTABLE, Boolean.TRUE.toString()); |
| }}; |
| } |
| |
| @MockInjector |
| public Class<?> mockitoInjector() { |
| return MockitoInjector.class; |
| } |
| |
| @Module |
| public Class<?>[] app() { |
| return new Class<?>[]{GreetingService.class, Messager.class}; |
| } |
| |
| @Test |
| public void checkMockIsUsed() throws IOException { |
| when(messager.message()).thenReturn("mockito"); |
| |
| final String message = IO.slurp(new URL("http://localhost:4204/GreetingServiceTest/greeting/")); |
| assertEquals("mockito", message); |
| } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>We can see the usage and configuration of ApplicationComposer. More information about it can be found <a href="http://tomee.apache.org/tomee-8.0/docs/application-composer/index.html">here</a>. |
| An other interesting annotation is <code>@MockInjector</code>. This informs the container started by Application composer that Mockito is used, so mock proprieties will be injected.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The test method stubs the <code>messager.message()</code> method, returning the value "mockito". Then, it checks that by accessing <code>GET greeting</code>, the retrieved content is "mockito".</p> |
| </div> |
| <div class="paragraph"> |
| <p>Full code example can be found <a href="https://github.com/apache/tomee/tree/master/examples/rest-applicationcomposer-mockito">here</a>. It’s a maven project, and the tests can be run by the <code>mvn clean install</code> command.</p> |
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