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  <body class="article toc2 toc-left">
  <div id="header">
  <h1>Contracts on the Producer side 2.2.4.BUILD-SNAPSHOT</h1>
  <div id="toc" class="toc2">
  <div id="toctitle">Table of Contents</div>
  <ul class="sectlevel1">
  <li><a href="#_scenarios">Scenarios</a></li>
  <li><a href="#_flow">Flow</a></li>
  <li><a href="#_tutorial">Tutorial</a>
  <ul class="sectlevel2">
  <li><a href="#_consumer_flow_1">Consumer flow 1</a>
  <ul class="sectlevel3">
  <li><a href="#_writing_the_missing_consumer_http_implementation">Writing the Missing Consumer HTTP Implementation</a></li>
  <li><a href="#_turning_on_stub_runner_in_http_consumer_tests">Turning on Stub Runner in HTTP Consumer Tests</a></li>
  <li><a href="#_playing_with_the_http_contracts">Playing with the HTTP Contracts</a></li>
  </ul>
  </li>
  <li><a href="#_producer_flow_1">Producer Flow 1</a>
  <ul class="sectlevel3">
  <li><a href="#_ide_setup">IDE setup</a></li>
  <li><a href="#_setting_up_the_spring_cloud_contract_plugin">Setting up the Spring Cloud Contract plugin</a></li>
  <li><a href="#_updating_contracts_from_the_pr">Updating Contracts from the PR</a></li>
  <li><a href="#_generating_tests_from_contracts">Generating tests from contracts</a></li>
  <li><a href="#_fixing_broken_http_tests">Fixing broken HTTP tests</a></li>
  </ul>
  </li>
  <li><a href="#_consumer_flow_2">Consumer flow 2</a></li>
  </ul>
  </li>
  <li><a href="#_solutions">Solutions</a>
  <ul class="sectlevel2">
  <li><a href="#_written_consumer_tests">Written consumer tests</a></li>
  <li><a href="#_adding_spring_cloud_contract_dependency">Adding Spring Cloud Contract Dependency</a></li>
  <li><a href="#_proposal_of_simple_contracts_by_consumer">Proposal of simple contracts by consumer</a></li>
  <li><a href="#_missing_consumer_controller_code">Missing consumer controller code</a></li>
  <li><a href="#_stub_logs">Stub Logs</a></li>
  <li><a href="#_beer_request">Beer Request</a></li>
  <li><a href="#_missing_listener_code">Missing listener code</a></li>
  <li><a href="#_missing_triggers">Missing triggers</a></li>
  <li><a href="#_messaging_dsls">Messaging DSLs</a></li>
  <li><a href="#_producercontroller_implementation">ProducerController implementation</a></li>
  <li><a href="#_beerrestbase">BeerRestBase</a></li>
  <li><a href="#_beermessagingbase">BeerMessagingBase</a></li>
  <li><a href="#_messaging_implementation">Messaging implementation</a></li>
  <li><a href="#_missing_consumer_controller_code_with_discovery">Missing Consumer Controller Code with Discovery</a></li>
  </ul>
  </li>
  <li><a href="#_back_to_the_main_page">Back to the Main Page</a></li>
  </ul>
  </div>
  </div>
  <div id="content">
  <div id="preamble">
  <div class="sectionbody">
  <div class="paragraph">
  <p>In this tutorial, we keep the contracts together with the producer code. On the consumer
  side, we be using Service Discovery.</p>
  </div>
  </div>
  </div>
  <div class="sect1">
  <h2 id="_scenarios">Scenarios</h2>
  <div class="sectionbody">
  <div class="imageblock">
  <div class="content">
  <img src="../images/beer_1.png" alt="beer 1">
  </div>
  <div class="title">Figure 1. Positive beer selling via HTTP</div>
  </div>
  <div class="paragraph">
  <p>&#160;
  &#160;</p>
  </div>
  <div class="imageblock">
  <div class="content">
  <img src="../images/beer_2.png" alt="beer 2">
  </div>
  <div class="title">Figure 2. Negative beer selling via HTTP</div>
  </div>
  <div class="paragraph">
  <p>&#160;
  &#160;</p>
  </div>
  </div>
  </div>
  <div class="sect1">
  <h2 id="_flow">Flow</h2>
  <div class="sectionbody">
  <div class="imageblock">
  <div class="content">
  <img src="../images/flow.png" alt="flow">
  </div>
  <div class="title">Figure 3. Consumer Driven Contract flow</div>
  </div>
  </div>
  </div>
  <div class="sect1">
  <h2 id="_tutorial">Tutorial</h2>
  <div class="sectionbody">
  <div class="paragraph">
  <p>Using Consumer Driven Contracts is like using TDD at the architecture level. We start by
  writing a test on the consumer side.</p>
  </div>
  <div class="sect2">
  <h3 id="_consumer_flow_1">Consumer flow 1</h3>
  <div class="imageblock">
  <div class="content">
  <img src="../images/consumer_flow_1.png" alt="consumer flow 1">
  </div>
  <div class="title">Figure 4. Interact with cloned producer code</div>
  </div>
  <div class="paragraph">
  <p>Let&#8217;s go back to our consumer code. We need to look at <code>BeerControllerTest</code> and
  <code>BeerController</code>. We know how we would like the API to look, so now we can write the
  missing implementation in the <code>BeerController</code>.</p>
  </div>
  <div class="admonitionblock tip">
  <table>
  <tr>
  <td class="icon">
  <div class="title">Tip</div>
  </td>
  <td class="content">
  Remember that, in order to use the load balancing features, we need to add the
  <code>org.springframework.cloud:spring-cloud-starter-netflix-eureka-client</code> dependency.
  </td>
  </tr>
  </table>
  </div>
  <div class="listingblock primary">
  <div class="title">Maven</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-xml" data-lang="xml">&lt;dependency&gt;
      &lt;groupId&gt;org.springframework.cloud&lt;/groupId&gt;
      &lt;artifactId&gt;spring-cloud-starter-netflix-eureka-client&lt;/artifactId&gt;
  &lt;/dependency&gt;</code></pre>
  </div>
  </div>
  <div class="listingblock secondary">
  <div class="title">Gradle</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">implementation("org.springframework.cloud:spring-cloud-starter-netflix-eureka-client")</code></pre>
  </div>
  </div>
  <div class="paragraph">
  <p>Also, you need to register the <code>RestTemplate</code> bean as <code>@LoadBalanced</code>. Go to
  the <code>ClientApplication</code> class and register the bean as follows:</p>
  </div>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">@Bean
  @LoadBalanced
  RestTemplate restTemplate() {
      return new RestTemplate();
  }</code></pre>
  </div>
  </div>
  <div class="paragraph">
  <p>Now let&#8217;s assume that we call the producer application by using the
  <code><a href="http://somenameforproducer/check" class="bare">http://somenameforproducer/check</a></code> URL. You need to provide some properties to tell Stub
  Runner that the given service name (in our case, <code>somenameforproducer</code>) should be mapped
  to the running HTTP server stub of a given producer. Let&#8217;s set those properties.
  Stub Runner requires you to set the <code>stubrunner.idsToServiceIds</code> mapping in which the key
  is the artifact ID and the value is the service name in the code. You also need to define
  the <code>idsToServiceIds</code> property, as shown in the following code:</p>
  </div>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-yml" data-lang="yml">stubrunner:
    idsToServiceIds:
      beer-api-producer: somenameforproducer</code></pre>
  </div>
  </div>
  <div class="paragraph">
  <p>When you call the URL <code><a href="http://somenameforproducer/check" class="bare">http://somenameforproducer/check</a></code>, it will get redirected to a
  fake HTTP instance that was started with the <code>beer-api-producer</code> stubs JAR. We know how
  the API needs to look, so we can now go ahead and try to write the missing implementation
  of the <code>BeerController</code>.</p>
  </div>
  <div class="sect3">
  <h4 id="_writing_the_missing_consumer_http_implementation">Writing the Missing Consumer HTTP Implementation</h4>
  <div class="ulist">
  <ul>
  <li>
  <p>Let&#8217;s go back to our, consumer&#8217;s code - let&#8217;s go back to the <code>BeerControllerTest</code> and <code>BeerController</code>.
  We know how we would like the API to look like so now we can write the missing implementation in the
  <code>BeerController</code>. Let&#8217;s assume that the producer application will be running at
   <code><a href="http://localhost:8090/" class="bare">http://localhost:8090/</a></code>. Now go ahead and try to write the missing implementation
    of the <code>BeerController</code></p>
  </li>
  <li>
  <p>In case of any issues you can check out the <a href="#_missing_consumer_controller_code_with_discovery">solution</a></p>
  </li>
  </ul>
  </div>
  </div>
  <div class="sect3">
  <h4 id="_turning_on_stub_runner_in_http_consumer_tests">Turning on Stub Runner in HTTP Consumer Tests</h4>
  <div class="ulist">
  <ul>
  <li>
  <p>Now it&#8217;s time to turn on the magic! Let&#8217;s add the Spring Cloud Starter Contract Stub Runner test dependency.</p>
  <div class="listingblock primary">
  <div class="title">Maven</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-xml" data-lang="xml">&lt;dependency&gt;
  	&lt;groupId&gt;org.springframework.cloud&lt;/groupId&gt;
  	&lt;artifactId&gt;spring-cloud-starter-contract-stub-runner&lt;/artifactId&gt;
  	&lt;scope&gt;test&lt;/scope&gt;
  &lt;/dependency&gt;</code></pre>
  </div>
  </div>
  <div class="listingblock secondary">
  <div class="title">Gradle</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">testImplementation("org.springframework.cloud:spring-cloud-starter-contract-stub-runner")</code></pre>
  </div>
  </div>
  </li>
  <li>
  <p>We can annotate our test class with
  <code>@AutoConfigureStubRunner(stubsMode = StubRunnerProperties.StubsMode.LOCAL, ids = "com.example:beer-api-producer:+:stubs:8090")</code>. What that
  will do is:</p>
  <div class="ulist">
  <ul>
  <li>
  <p>it will download the stub JARs from Maven local (<code>stubsMode = StubRunnerProperties.StubsMode.LOCAL</code>)</p>
  </li>
  <li>
  <p>it will search for a JAR with coordinates <code>com.example:beer-api-producer</code> with latest version (<code>+</code>)
  and <code>stubs</code> classifier. Once it&#8217;s found the fake HTTP server stub will be started at port <code>8090</code></p>
  </li>
  </ul>
  </div>
  </li>
  <li>
  <p>Rerun the test - it should automagically pass!</p>
  <div class="ulist">
  <ul>
  <li>
  <p>In the logs you will see information about downloading, unpacking and starting stubs (<a href="#_stub_logs">see the logs</a>)</p>
  </li>
  <li>
  <p>What happened is that we could interact with real API without writing a single line of production code</p>
  </li>
  </ul>
  </div>
  </li>
  </ul>
  </div>
  </div>
  <div class="sect3">
  <h4 id="_playing_with_the_http_contracts">Playing with the HTTP Contracts</h4>
  <div class="ulist">
  <ul>
  <li>
  <p>TDD is about red, green and refactor. We went through the first two. Time to refactor the code.
  We come to the conclusion that the <code>name</code> field is unnecessary. In the <code>BeerController.java</code> file let&#8217;s
  create a new class called <code>BeerRequest</code> that will contain only age field and let&#8217;s try to send that
  to our stubbed producer. (<a href="#_beer_request">Show solution</a>)</p>
  </li>
  <li>
  <p>Let&#8217;s run the tests again - what will happen is that the tests will fail. That&#8217;s because in the contract
  you have explicitly described that you want the <code>name</code> to be there. As you can see all the typos will be
  caught during the build time of your project.</p>
  <div class="ulist">
  <ul>
  <li>
  <p>The same will happen if you leave the <code>name</code> but change the <code>age</code> to some other value (e.g. 28).
  Our stubs at the moment are very strict. We&#8217;ll try to fix that in a second</p>
  </li>
  </ul>
  </div>
  </li>
  <li>
  <p>To fix this you need to go back with your IDE to the producer and modify your HTTP contracts.</p>
  <div class="ulist">
  <ul>
  <li>
  <p>Just remove the <code>name</code> field from the request body.</p>
  </li>
  <li>
  <p>Spring Cloud Contract allows you to provide dynamic values for parts of body, urls, headers etc.
  This is especially useful when working with dates, database ids, UUIDs etc.</p>
  </li>
  <li>
  <p>Let&#8217;s open the <code>shouldGrantABeerIfOldEnough.groovy</code> and go to the request body <code>age</code> element</p>
  </li>
  <li>
  <p>Instead of <code>22</code> write <code>$(regex('[2-9][0-9]'))</code>. Now let&#8217;s analyze what this is.</p>
  <div class="ulist">
  <ul>
  <li>
  <p>In order to tell Spring Cloud Contract that there will be a dynamic value set you have to use either
  the <code>$()</code> or <code>value()</code> method. They are equivalent.</p>
  </li>
  <li>
  <p>Next we use <code>regex()</code> method that converts your <code>String</code> into <code>Pattern</code>. In this case we assume
  a 2 digit number greater or equal to <code>20</code></p>
  </li>
  </ul>
  </div>
  </li>
  <li>
  <p>Repeat the same process for the <code>shouldRejectABeerIfTooYoung.groovy</code> contract but change the
  regular expression to <code>[0-1][0-9]</code></p>
  </li>
  <li>
  <p>Run the building with test skipping and check the output of stubs. You&#8217;ll see that the generated
  mappings have changed from equality check in JSON Path to regular expression check</p>
  </li>
  <li>
  <p>Go back to the consumer code and run the <code>BeerControlerTest</code> again. This time it should pass. You can
  also change the values of age to e.g. <code>45</code> for the positive case and <code>11</code> for the negative on.</p>
  </li>
  </ul>
  </div>
  </li>
  </ul>
  </div>
  <div class="paragraph">
  <p>Congratulations! As a consumer, you have successfully used the API of the producer for
  both HTTP and messaging. Now you can file a pull request (PR) to the producer code with
  the proposal of the contract,</p>
  </div>
  <div class="paragraph">
  <p>Let&#8217;s switch to the producer side.</p>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_producer_flow_1">Producer Flow 1</h3>
  <div class="imageblock">
  <div class="content">
  <img src="../images/producer_flow_1.png" alt="producer flow 1">
  </div>
  <div class="title">Figure 5. Producer takes over the PR, writes missing impl and merges the PR</div>
  </div>
  <div class="sect3">
  <h4 id="_ide_setup">IDE setup</h4>
  <div class="ulist">
  <ul>
  <li>
  <p>Open in your IDE the <code>producer</code> project (either via Maven or Gradle)</p>
  </li>
  <li>
  <p>We&#8217;re assuming that we&#8217;ve taken over the PR. Example of how to achieve that in "real life" for a PR
  that got submitted to via a branch called <code>the_pr</code> looks like this:</p>
  </li>
  </ul>
  </div>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-bash" data-lang="bash">git fetch origin
  git checkout -b the_pr origin/the_pr
  git merge master</code></pre>
  </div>
  </div>
  <div class="ulist">
  <ul>
  <li>
  <p>The idea of Spring Cloud Contract is about stub and contract validity. Right now we have a set of
  contracts defined but we haven&#8217;t tested it against the producer side. Time to change that!</p>
  </li>
  </ul>
  </div>
  </div>
  <div class="sect3">
  <h4 id="_setting_up_the_spring_cloud_contract_plugin">Setting up the Spring Cloud Contract plugin</h4>
  <div class="ulist">
  <ul>
  <li>
  <p>Spring Cloud Contract can generate tests from your contracts to ensure that your implementation&#8217;s API
  is compatible with the defined contract. Let&#8217;s set up the project to start generating tests.</p>
  <div class="ulist">
  <ul>
  <li>
  <p>Spring Cloud Contract needs a base class that all of the generated tests will extend. Currently
  we support 3 different ways of defining a base class (you can read more about this in the
  Spring Cloud Contract documentation for <a href="https://cloud.spring.io/spring-cloud-contract/spring-cloud-contract.html#_configure_plugin">Gradle</a>
  and <a href="https://cloud.spring.io/spring-cloud-contract/spring-cloud-contract.html#_configure_plugin_2">Maven</a>)</p>
  <div class="ulist">
  <ul>
  <li>
  <p>a single class for all tests</p>
  </li>
  <li>
  <p>convention based naming (takes 2 last package names and appends <code>Base</code>. Having a contract
  <code>src/test/resources/contracts/foo/bar/shouldDoSth.groovy</code> would create a test class called
  <code>BarTest</code> that would extend <code>FooBarBase</code> class.</p>
  </li>
  <li>
  <p>manual mapping (you can state that contracts matching certain regular expression will have to
  have a base class with fully qualified name equal to X)</p>
  </li>
  </ul>
  </div>
  </li>
  <li>
  <p>In the following example we&#8217;ll play with convention based naming</p>
  <div class="ulist">
  <ul>
  <li>
  <p>For Maven under the plugin setup you have to set up the plugin configuration
  <code>&lt;configuration&gt;&lt;packageWithBaseClasses&gt;com.example&lt;/packageWithBaseClasses&gt;&lt;/configuration&gt;</code></p>
  <div class="listingblock primary">
  <div class="title">Maven</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-xml" data-lang="xml">&lt;plugin&gt;
      &lt;groupId&gt;org.springframework.cloud&lt;/groupId&gt;
      &lt;artifactId&gt;spring-cloud-contract-maven-plugin&lt;/artifactId&gt;
      &lt;version&gt;${spring-cloud-contract.version}&lt;/version&gt;
      &lt;extensions&gt;true&lt;/extensions&gt;
      &lt;configuration&gt;
          &lt;packageWithBaseClasses&gt;com.example&lt;/packageWithBaseClasses&gt;
      &lt;/configuration&gt;
  &lt;/plugin&gt;</code></pre>
  </div>
  </div>
  <div class="listingblock secondary">
  <div class="title">Gradle</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">contracts {
      packageWithBaseClasses = 'com.example'
  }</code></pre>
  </div>
  </div>
  </li>
  <li>
  <p>In both cases passing of that value tells the plugin that a given base class is available under
  the <code>com.example</code> package</p>
  </li>
  </ul>
  </div>
  </li>
  </ul>
  </div>
  </li>
  </ul>
  </div>
  </div>
  <div class="sect3">
  <h4 id="_updating_contracts_from_the_pr">Updating Contracts from the PR</h4>
  
  </div>
  <div class="sect3">
  <h4 id="_generating_tests_from_contracts">Generating tests from contracts</h4>
  <div class="ulist">
  <ul>
  <li>
  <p>Let&#8217;s generate the tests! Just call:</p>
  <div class="listingblock primary">
  <div class="title">Maven</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-bash" data-lang="bash">$ ./mvnw clean install</code></pre>
  </div>
  </div>
  <div class="listingblock secondary">
  <div class="title">Gradle</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-bash" data-lang="bash">$ ./gradlew clean build publishToMavenLocal</code></pre>
  </div>
  </div>
  <div class="ulist">
  <ul>
  <li>
  <p>Suddenly some tests should start failing. Those tests are the autogenerated tests created
  by Spring Cloud Contract</p>
  </li>
  <li>
  <p>The tests lay under <code>/generated-test-sources/contracts/org/springframework/cloud/contract/verifier/tests/beer</code>
  in <code>target</code> for Maven or <code>build</code> for Gradle</p>
  </li>
  <li>
  <p>There will be a test for each folder in which you store your contracts. The name of the test class
  will be the name of that folder</p>
  </li>
  <li>
  <p>Each of the contracts will be a single test inside that test class</p>
  </li>
  <li>
  <p>If you check out the generated tests you&#8217;ll notice that the dynamic parts of the <code>request</code> part
  of the contract got converted to a concrete value. Any dynamic bits on the <code>response</code> side would be
  converted into matchers.</p>
  </li>
  </ul>
  </div>
  </li>
  <li>
  <p>Time to fix the broken tests. We need to do that by providing the missing implementation.</p>
  </li>
  </ul>
  </div>
  </div>
  <div class="sect3">
  <h4 id="_fixing_broken_http_tests">Fixing broken HTTP tests</h4>
  <div class="ulist">
  <ul>
  <li>
  <p>Let&#8217;s start with HTTP</p>
  <div class="ulist">
  <ul>
  <li>
  <p>First let&#8217;s write the missing implementation in <code>ProducerController</code>. The logic to be written
  is extremely simple - if the <code>personCheckingService.shouldGetBeer(&#8230;&#8203;)</code> returns <code>true</code> then we
  should return <code>new Response(BeerCheckStatus.OK)</code>. Otherwise <code>new Response(BeerCheckStatus.NOT_OK)</code>.
  (<a href="#_producerController_implementation">Show solution</a>)</p>
  </li>
  </ul>
  </div>
  </li>
  <li>
  <p>Let&#8217;s fix the <code>BeerRestBase</code> class now</p>
  <div class="ulist">
  <ul>
  <li>
  <p>The idea of CDC is <strong>NOT TO TEST</strong> every single feature. Contract tests are there to see if the API
  is matched, <strong>NOT</strong> that the feature is working. That&#8217;s why we shouldn&#8217;t be accessing databases etc.
  That means that we will work with mock of the <code>PersonCheckingService</code>. (<a href="#_beerrestbase">Show solution</a>)</p>
  </li>
  <li>
  <p>Let&#8217;s annotate the test class with <code>@RunWith(MockitoJUnitRunner.class)</code> to enable Mockito runner.</p>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">@RunWith(MockitoJUnitRunner.class)
  public abstract class BeerRestBase {
  ...
  }</code></pre>
  </div>
  </div>
  </li>
  <li>
  <p>We&#8217;ll want to test the <code>ProducerController</code> so we can create a field <code>@InjectMocks ProducerController
  producerController</code>. Mockito will inject any mocks for us via the constructor.</p>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">    @Mock PersonCheckingService personCheckingService;
      @InjectMocks ProducerController producerController;
  
      @Before
      public void setup() {
          given(personCheckingService.shouldGetBeer(argThat(oldEnough()))).willReturn(true);
      }</code></pre>
  </div>
  </div>
  </li>
  <li>
  <p>It won&#8217;t compile cause we don&#8217;t have the <code>oldEnough()</code> method but don&#8217;t worry. So this line stubs
  the <code>shouldGetBeer</code> method in such a way that if the user is old enough then the method will return
  true. Let&#8217;s now add the <code>oldEnoughMethod()</code></p>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">	private TypeSafeMatcher&lt;PersonToCheck&gt; oldEnough() {
  		return new TypeSafeMatcher&lt;PersonToCheck&gt;() {
  			@Override protected boolean matchesSafely(PersonToCheck personToCheck) {
  				return personToCheck.age &gt;= 20;
  			}
  			@Override public void describeTo(Description description) {
  			}
  		};
  	}</code></pre>
  </div>
  </div>
  </li>
  <li>
  <p>We&#8217;re using the <code>TypeSafeMatcher</code> from Hamcrest to create a matcher for <code>PersonToCheck</code>. In this case
  if the person to check is older or is 20 then the method <code>shouldGetBeer</code> method will return <code>true</code>.</p>
  </li>
  <li>
  <p>Now we need to configure <a href="http://rest-assured.io/">RestAssured</a> that is used by Spring Cloud Contract
  to send requests. In our case we want to profit from MockMvc. In order to set the <code>ProducerController</code>
  with RestAssured it&#8217;s enough to call <code>RestAssuredMockMvc.standaloneSetup(producerController);</code></p>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">@RunWith(MockitoJUnitRunner.class)
  public abstract class BeerRestBase {
  
      @Mock PersonCheckingService personCheckingService;
      @InjectMocks ProducerController producerController;
  
      @Before
      public void setup() {
          given(personCheckingService.shouldGetBeer(argThat(oldEnough()))).willReturn(true);
          RestAssuredMockMvc.standaloneSetup(producerController);
      }
  
      private TypeSafeMatcher&lt;PersonToCheck&gt; oldEnough() {
          return new TypeSafeMatcher&lt;PersonToCheck&gt;() {
              @Override protected boolean matchesSafely(PersonToCheck personToCheck) {
                  return personToCheck.age &gt;= 20;
              }
              @Override public void describeTo(Description description) {
              }
          };
      }
  }</code></pre>
  </div>
  </div>
  </li>
  <li>
  <p>With mocks and RestAssured setup - we&#8217;re ready to run our HTTP based autogenerated tests</p>
  </li>
  </ul>
  </div>
  </li>
  </ul>
  </div>
  <div class="paragraph">
  <p>Now you could merge the PR to master, and your CI system would build a fat jar and the
  stubs.</p>
  </div>
  <div class="paragraph">
  <p>Congratulations! You&#8217;ve completed the producer side of this tutorial.</p>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_consumer_flow_2">Consumer flow 2</h3>
  <div class="imageblock">
  <div class="content">
  <img src="../images/consumer_flow_2.png" alt="consumer flow 2">
  </div>
  <div class="title">Figure 6. Switch to work online</div>
  </div>
  <div class="ulist">
  <ul>
  <li>
  <p>After merging the PR the producer&#8217;s stubs reside in some Artifactory / Nexus instance</p>
  </li>
  <li>
  <p>As consumers we no longer want to retrieve the stubs from our local Maven repository -
  we&#8217;d like to download them from the remote location</p>
  </li>
  <li>
  <p>To do that (we won&#8217;t do that for the tutorial but you would do it in your "production"
  code) it&#8217;s enough to pass the <code>repositoryRoot</code> parameter and set the
  <code>stubsMode</code> to <code>StubRunnerProperties.StubsMode.REMOTE</code></p>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">@RunWith(SpringRunner.class)
  @SpringBootTest(webEnvironment = WebEnvironment.MOCK)
  @AutoConfigureMockMvc
  @AutoConfigureJsonTesters
  @AutoConfigureStubRunner(
  repositoryRoot="http://www.foo.com/bar,
  ids = "com.example:beer-api-producer:+:stubs:8090",
  stubsMode = StubRunnerProperties.StubsMode.REMOTE
  )
  @DirtiesContext
  public class YourTestOnTheConsumerSide extends AbstractTest {
  }</code></pre>
  </div>
  </div>
  <div class="ulist">
  <ul>
  <li>
  <p>Another option is to pass the property <code>stubrunner.repositoryRoot</code> either as a
  system / environment property, or via an <code>application.yml</code> and <code>stubrunner.stubs-mode</code>
  equal to <code>remote</code></p>
  </li>
  </ul>
  </div>
  </li>
  </ul>
  </div>
  </div>
  </div>
  </div>
  <div class="sect1">
  <h2 id="_solutions">Solutions</h2>
  <div class="sectionbody">
  <div class="sect2">
  <h3 id="_written_consumer_tests">Written consumer tests</h3>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">	@Test
  	public void should_give_me_a_beer_when_im_old_enough() throws Exception {
  		//remove::start[]
  		this.mockMvc.perform(MockMvcRequestBuilders.post("/beer")
  				.contentType(MediaType.APPLICATION_JSON)
  				.content(this.json.write(new Person("marcin", 22)).getJson()))
  				.andExpect(status().isOk())
  				.andExpect(content().string("THERE YOU GO"));
  		//remove::end[]
  	}
  
  	@Test
  	public void should_reject_a_beer_when_im_too_young() throws Exception {
  		//remove::start[]
  		this.mockMvc.perform(MockMvcRequestBuilders.post("/beer")
  				.contentType(MediaType.APPLICATION_JSON)
  				.content(this.json.write(new Person("marcin", 17)).getJson()))
  				.andExpect(status().isOk())
  				.andExpect(content().string("GET LOST"));
  		//remove::end[]
  	}</code></pre>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_adding_spring_cloud_contract_dependency">Adding Spring Cloud Contract Dependency</h3>
  <div class="listingblock primary">
  <div class="title">Maven</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-xml" data-lang="xml">&lt;dependency&gt;
  	&lt;groupId&gt;org.springframework.cloud&lt;/groupId&gt;
  	&lt;artifactId&gt;spring-cloud-starter-contract-verifier&lt;/artifactId&gt;
  	&lt;scope&gt;test&lt;/scope&gt;
  &lt;/dependency&gt;</code></pre>
  </div>
  </div>
  <div class="listingblock secondary">
  <div class="title">Gradle</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">testImplementation("org.springframework.cloud:spring-cloud-starter-contract-verifier")</code></pre>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_proposal_of_simple_contracts_by_consumer">Proposal of simple contracts by consumer</h3>
  <div class="paragraph">
  <p><strong>HTTP communication</strong></p>
  </div>
  <div class="listingblock primary">
  <div class="title">Old Enough</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">// rest/shouldGrantABeerIfOldEnough.groovy
  org.springframework.cloud.contract.spec.Contract.make {
  		description("""
  Represents a successful scenario of getting a beer
  
  ```
  given:
  	client is old enough
  when:
  	he applies for a beer
  then:
  	we'll grant him the beer
  ```
  
  """)
  	request {
  		method 'POST'
  		url '/check'
  		body(
  				age: 22,
  				name: "marcin"
  		)
  		headers {
  			contentType(applicationJson())
  		}
  	}
  	response {
  		status 200
  		body("""
  			{
  				"status": "OK"
  			}
  			""")
  		headers {
  			contentType(applicationJson())
  		}
  	}
  }</code></pre>
  </div>
  </div>
  <div class="listingblock secondary">
  <div class="title">Too Young</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">// rest/shouldRejectABeerIfTooYoung.groovy
  org.springframework.cloud.contract.spec.Contract.make {
  		description("""
  Represents a successful scenario of getting a beer
  
  ```
  given:
  	client is old enough
  when:
  	he applies for a beer
  then:
  	we'll grant him the beer
  ```
  
  """)
  	request {
  		method 'POST'
  		url '/check'
  		body(
  				age: 17,
  				name: "marcin"
  		)
  		headers {
  			contentType(applicationJson())
  		}
  	}
  	response {
  		status 200
  		body("""
  			{
  				"status": "NOT_OK"
  			}
  			""")
  		headers {
  			contentType(applicationJson())
  		}
  	}
  }</code></pre>
  </div>
  </div>
  <div class="paragraph">
  <p><strong>Messaging communication</strong></p>
  </div>
  <div class="listingblock primary">
  <div class="title">Positive Verification</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">// messaging/shouldSendAcceptedVerification.groovy
  org.springframework.cloud.contract.spec.Contract.make {
  	description("""
  Sends a positive verification message when person is eligible to get the beer
  
  ```
  given:
  	client is old enough
  when:
  	he applies for a beer
  then:
  	we'll send a message with a positive verification
  ```
  
  """)
  	// Label by means of which the output message can be triggered
  	label 'accepted_verification'
  	// output message of the contract
  	outputMessage {
  		// destination to which the output message will be sent
  		sentTo 'verifications'
  		// the body of the output message
  		body(
              eligible: true
  		)
  		headers {
  			header("contentType", applicationJsonUtf8())
  		}
  	}
  }</code></pre>
  </div>
  </div>
  <div class="listingblock secondary">
  <div class="title">Negative Verification</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">// messaging/shouldSendRejectedVerification.groovy
  org.springframework.cloud.contract.spec.Contract.make {
  	description("""
  Sends a negative verification message when person is not eligible to get the beer
  
  ```
  given:
  	client is too young
  when:
  	he applies for a beer
  then:
  	we'll send a message with a negative verification
  ```
  
  """)
  	// Label by means of which the output message can be triggered
  	label 'rejected_verification'
  	// output message of the contract
  	outputMessage {
  		// destination to which the output message will be sent
  		sentTo 'verifications'
  		// the body of the output message
  		body(
              eligible: false
  		)
  		headers {
  			header("contentType", applicationJsonUtf8())
  		}
  	}
  }</code></pre>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_missing_consumer_controller_code">Missing consumer controller code</h3>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">		ResponseEntity&lt;Response&gt; response = this.restTemplate.exchange(
  				RequestEntity
  						.post(URI.create("http://localhost:" + this.port + "/check"))
  						.contentType(MediaType.APPLICATION_JSON)
  						.body(person),
  				Response.class);
  		switch (response.getBody().status) {
  		case OK:
  			return "THERE YOU GO";
  		default:
  			return "GET LOST";
  		}</code></pre>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_stub_logs">Stub Logs</h3>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-bash" data-lang="bash">2017-05-11 12:16:51.146  INFO 4693 --- [           main] o.s.c.c.s.StubDownloaderBuilderProvider  : Will download stubs using Aether
  2017-05-11 12:16:51.148  INFO 4693 --- [           main] o.s.c.c.stubrunner.AetherStubDownloader  : Remote repos not passed but the switch to work offline was set. Stubs will be used from your local Maven repository.
  2017-05-11 12:16:51.291  INFO 4693 --- [           main] o.s.c.c.stubrunner.AetherStubDownloader  : Desired version is [+] - will try to resolve the latest version
  2017-05-11 12:16:51.308  INFO 4693 --- [           main] o.s.c.c.stubrunner.AetherStubDownloader  : Resolved version is [0.0.1-SNAPSHOT]
  2017-05-11 12:16:51.309  INFO 4693 --- [           main] o.s.c.c.stubrunner.AetherStubDownloader  : Resolving artifact [com.example:{producer_artifact}:jar:stubs:0.0.1-SNAPSHOT] using remote repositories []
  2017-05-11 12:16:51.317  INFO 4693 --- [           main] o.s.c.c.stubrunner.AetherStubDownloader  : Resolved artifact [com.example:{producer_artifact}:jar:stubs:0.0.1-SNAPSHOT] to /home/marcin/.m2/repository/com/example/{producer_artifact}/0.0.1-SNAPSHOT/{producer_artifact}-0.0.1-SNAPSHOT-stubs.jar
  2017-05-11 12:16:51.322  INFO 4693 --- [           main] o.s.c.c.stubrunner.AetherStubDownloader  : Unpacking stub from JAR [URI: file:/home/marcin/.m2/repository/com/example/{producer_artifact}/0.0.1-SNAPSHOT/{producer_artifact}-0.0.1-SNAPSHOT-stubs.jar]
  2017-05-11 12:16:51.327  INFO 4693 --- [           main] o.s.c.c.stubrunner.AetherStubDownloader  : Unpacked file to [/tmp/contracts9053257535983128167]
  2017-05-11 12:16:52.608  INFO 4693 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@699e0bf0: startup date [Thu May 11 12:16:52 CEST 2017]; root of context hierarchy
  2017-05-11 12:16:52.684  INFO 4693 --- [           main] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
  2017-05-11 12:16:52.837  INFO 4693 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8090 (http)
  2017-05-11 12:16:52.851  INFO 4693 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat
  2017-05-11 12:16:52.853  INFO 4693 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.14
  2017-05-11 12:16:52.975  INFO 4693 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
  2017-05-11 12:16:52.975  INFO 4693 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 367 ms
  2017-05-11 12:16:52.996  INFO 4693 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'stub' to [/]
  2017-05-11 12:16:53.000  INFO 4693 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'admin' to [/__admin/*]
  2017-05-11 12:16:53.135  INFO 4693 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8090 (http)
  2017-05-11 12:16:53.139  INFO 4693 --- [           main] o.s.c.contract.stubrunner.StubServer     : Started stub server for project [com.example:{producer_artifact}:0.0.1-SNAPSHOT:stubs] on port 8090</code></pre>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_beer_request">Beer Request</h3>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">class BeerRequest {
  	public int age;
  
  	public BeerRequest(int age) {
  		this.age = age;
  	}
  
  	public BeerRequest() {
  	}
  }</code></pre>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_missing_listener_code">Missing listener code</h3>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">		if (verification.eligible) {
  			this.eligibleCounter.incrementAndGet();
  		} else {
  			this.notEligibleCounter.incrementAndGet();
  		}</code></pre>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_missing_triggers">Missing triggers</h3>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">	@Test public void should_increase_the_eligible_counter_when_verification_was_accepted() throws Exception {
  		int initialCounter = this.listener.eligibleCounter.get();
  
  		//remove::start[]
  		this.stubTrigger.trigger("accepted_verification");
  		//remove::end[]
  
  		then(this.listener.eligibleCounter.get()).isGreaterThan(initialCounter);
  	}
  
  	@Test public void should_increase_the_noteligible_counter_when_verification_was_rejected() throws Exception {
  		int initialCounter = this.listener.notEligibleCounter.get();
  
  		//remove::start[]
  		this.stubTrigger.trigger("rejected_verification");
  		//remove::end[]
  
  		then(this.listener.notEligibleCounter.get()).isGreaterThan(initialCounter);
  	}</code></pre>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_messaging_dsls">Messaging DSLs</h3>
  <div class="listingblock primary">
  <div class="title">Positive Verification</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">// messaging/shouldSendAcceptedVerification.groovy
  org.springframework.cloud.contract.spec.Contract.make {
  	description("""
  Sends a positive verification message when person is eligible to get the beer
  
  ```
  given:
  	client is old enough
  when:
  	he applies for a beer
  then:
  	we'll send a message with a positive verification
  ```
  
  """)
  	// Label by means of which the output message can be triggered
  	label 'accepted_verification'
  	// input to the contract
  	input {
  		// the contract will be triggered by a method
  		triggeredBy('clientIsOldEnough()')
  	}
  	// output message of the contract
  	outputMessage {
  		// destination to which the output message will be sent
  		sentTo 'verifications'
  		// the body of the output message
  		body(
              eligible: true
  		)
  		headers {
  			header("contentType", applicationJsonUtf8())
  		}
  	}
  }</code></pre>
  </div>
  </div>
  <div class="listingblock secondary">
  <div class="title">Negative Verification</div>
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-groovy" data-lang="groovy">// messaging/shouldSendRejectedVerification.groovy
  org.springframework.cloud.contract.spec.Contract.make {
  	description("""
  Sends a negative verification message when person is not eligible to get the beer
  
  ```
  given:
  	client is too young
  when:
  	he applies for a beer
  then:
  	we'll send a message with a negative verification
  ```
  
  """)
  	// Label by means of which the output message can be triggered
  	label 'rejected_verification'
  	// input to the contract
  	input {
  		// the contract will be triggered by a method
  		triggeredBy('clientIsTooYoung()')
  	}
  	// output message of the contract
  	outputMessage {
  		// destination to which the output message will be sent
  		sentTo 'verifications'
  		// the body of the output message
  		body(
              eligible: false
  		)
  		headers {
  			header("contentType", applicationJsonUtf8())
  		}
  	}
  }</code></pre>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_producercontroller_implementation">ProducerController implementation</h3>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">if (personCheckingService.shouldGetBeer(personToCheck)) {
      return new Response(BeerCheckStatus.OK);
  }
  return new Response(BeerCheckStatus.NOT_OK);</code></pre>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_beerrestbase">BeerRestBase</h3>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">@RunWith(MockitoJUnitRunner.class)
  public abstract class BeerRestBase {
  	@Mock PersonCheckingService personCheckingService;
  	@InjectMocks ProducerController producerController;
  
  	@Before
  	public void setup() {
  		given(personCheckingService.shouldGetBeer(argThat(oldEnough()))).willReturn(true);
  		RestAssuredMockMvc.standaloneSetup(producerController);
  	}
  
  	private TypeSafeMatcher&lt;PersonToCheck&gt; oldEnough() {
  		return new TypeSafeMatcher&lt;PersonToCheck&gt;() {
  			@Override protected boolean matchesSafely(PersonToCheck personToCheck) {
  				return personToCheck.age &gt;= 20;
  			}
  
  			@Override public void describeTo(Description description) {
  
  			}
  		};
  	}
  }</code></pre>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_beermessagingbase">BeerMessagingBase</h3>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">@RunWith(SpringRunner.class)
  @SpringBootTest(classes = ProducerApplication.class, webEnvironment = SpringBootTest.WebEnvironment.NONE)
  @AutoConfigureMessageVerifier
  public abstract class BeerMessagingBase {
  	@Inject MessageVerifier messaging;
  	@Autowired PersonCheckingService personCheckingService;
  
  	@Before
  	public void setup() {
  		// let's clear any remaining messages
  		// output == destination or channel name
  		this.messaging.receive("output", 100, TimeUnit.MILLISECONDS);
  	}
  
  	public void clientIsOldEnough() {
  		personCheckingService.shouldGetBeer(new PersonToCheck(25));
  	}
  
  	public void clientIsTooYoung() {
  		personCheckingService.shouldGetBeer(new PersonToCheck(5));
  	}
  }</code></pre>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_messaging_implementation">Messaging implementation</h3>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">		boolean shouldGetBeer = personToCheck.age &gt;= 20;
  		this.source.output().send(MessageBuilder.withPayload(new Verification(shouldGetBeer)).build());
  		return shouldGetBeer;</code></pre>
  </div>
  </div>
  </div>
  <div class="sect2">
  <h3 id="_missing_consumer_controller_code_with_discovery">Missing Consumer Controller Code with Discovery</h3>
  <div class="listingblock">
  <div class="content">
  <pre class="prettyprint highlight"><code class="language-java" data-lang="java">		ResponseEntity&lt;Response&gt; response = this.restTemplate.exchange(
  				RequestEntity
  						.post(URI.create("http://somenameforproducer/check"))
  						.contentType(MediaType.APPLICATION_JSON)
  						.body(person),
  				Response.class);
  		switch (response.getBody().status) {
  		case OK:
  			return "THERE YOU GO";
  		default:
  			return "GET LOST";
  		}</code></pre>
  </div>
  </div>
  </div>
  </div>
  </div>
  <div class="sect1">
  <h2 id="_back_to_the_main_page">Back to the Main Page</h2>
  <div class="sectionbody">
  <div class="paragraph">
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