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Ryan Baxter
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<title>31. Testing</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud.html" title="Spring Cloud"><link rel="up" href="multi__spring_cloud_stream.html" title="Part IV. Spring Cloud Stream"><link rel="prev" href="multi__inter_application_communication.html" title="30. Inter-Application Communication"><link rel="next" href="multi__health_indicator_5.html" title="32. Health Indicator"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">31. Testing</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__inter_application_communication.html">Prev</a> </td><th width="60%" align="center">Part IV. Spring Cloud Stream</th><td width="20%" align="right"> <a accesskey="n" href="multi__health_indicator_5.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a name="_testing" href="#_testing"></a>31. Testing</h2></div></div></div><p>Spring Cloud Stream provides support for testing your microservice applications without connecting to a messaging system.
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<title>32. Testing</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud.html" title="Spring Cloud"><link rel="up" href="multi__spring_cloud_stream.html" title="Part V. Spring Cloud Stream"><link rel="prev" href="multi__inter_application_communication.html" title="31. Inter-Application Communication"><link rel="next" href="multi__health_indicator_5.html" title="33. Health Indicator"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">32. Testing</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__inter_application_communication.html">Prev</a> </td><th width="60%" align="center">Part V. Spring Cloud Stream</th><td width="20%" align="right"> <a accesskey="n" href="multi__health_indicator_5.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a name="_testing" href="#_testing"></a>32. Testing</h2></div></div></div><p>Spring Cloud Stream provides support for testing your microservice applications without connecting to a messaging system.
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You can do that by using the <code class="literal">TestSupportBinder</code> provided by the <code class="literal">spring-cloud-stream-test-support</code> library, which can be added as a test dependency to the application:</p><pre class="programlisting"> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-tag"><dependency></span>
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<span xmlns:d="http://docbook.org/ns/docbook" class="hl-tag"><groupId></span>org.springframework.cloud<span xmlns:d="http://docbook.org/ns/docbook" class="hl-tag"></groupId></span>
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<span xmlns:d="http://docbook.org/ns/docbook" class="hl-tag"><artifactId></span>spring-cloud-stream-test-support<span xmlns:d="http://docbook.org/ns/docbook" class="hl-tag"></artifactId></span>
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@@ -43,7 +43,7 @@ The following example shows how to test both input and output channels on a proc
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}</pre><p>In the example above, we are creating an application that has an input and an output channel, bound through the <code class="literal">Processor</code> interface.
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The bound interface is injected into the test so we can have access to both channels.
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We are sending a message on the input channel and we are using the <code class="literal">MessageCollector</code> provided by Spring Cloud Stream’s test support to capture the message has been sent to the output channel as a result.
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Once we have received the message, we can validate that the component functions correctly.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_disabling_the_test_binder_autoconfiguration" href="#_disabling_the_test_binder_autoconfiguration"></a>31.1 Disabling the test binder autoconfiguration</h2></div></div></div><p>The intent behind the test binder superseding all the other binders on the classpath is to make it easy to test your applications without making changes to your production dependencies.
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Once we have received the message, we can validate that the component functions correctly.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_disabling_the_test_binder_autoconfiguration" href="#_disabling_the_test_binder_autoconfiguration"></a>32.1 Disabling the test binder autoconfiguration</h2></div></div></div><p>The intent behind the test binder superseding all the other binders on the classpath is to make it easy to test your applications without making changes to your production dependencies.
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In some cases (e.g. integration tests) it is useful to use the actual production binders instead, and that requires disabling the test binder autoconfiguration.
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In order to do so, you can exclude the <code class="literal">org.springframework.cloud.stream.test.binder.TestSupportBinderAutoConfiguration</code> class using one of the Spring Boot autoconfiguration exclusion mechanisms, as in the following example.</p><pre class="programlisting"> <em><span class="hl-annotation" style="color: gray">@SpringBootApplication(exclude = TestSupportBinderAutoConfiguration.class)</span></em>
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<em><span class="hl-annotation" style="color: gray">@EnableBinding(Processor.class)</span></em>
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@@ -53,4 +53,4 @@ In order to do so, you can exclude the <code class="literal">org.springframework
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<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> String transform(String in) {
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<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">return</span> in + <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">" world"</span>;
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}
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}</pre><p>When autoconfiguration is disabled, the test binder is available on the classpath, and its <code class="literal">defaultCandidate</code> property is set to <code class="literal">false</code>, so that it does not interfere with the regular user configuration. It can be referenced under the name <code class="literal">test</code> e.g.:</p><pre class="screen">spring.cloud.stream.defaultBinder=test</pre></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__inter_application_communication.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="multi__spring_cloud_stream.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="multi__health_indicator_5.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">30. Inter-Application Communication </td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud.html">Home</a></td><td width="40%" align="right" valign="top"> 32. Health Indicator</td></tr></table></div></body></html>
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}</pre><p>When autoconfiguration is disabled, the test binder is available on the classpath, and its <code class="literal">defaultCandidate</code> property is set to <code class="literal">false</code>, so that it does not interfere with the regular user configuration. It can be referenced under the name <code class="literal">test</code> e.g.:</p><pre class="screen">spring.cloud.stream.defaultBinder=test</pre></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__inter_application_communication.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="multi__spring_cloud_stream.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="multi__health_indicator_5.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">31. Inter-Application Communication </td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud.html">Home</a></td><td width="40%" align="right" valign="top"> 33. Health Indicator</td></tr></table></div></body></html>
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