JUnit Integration Test Example
1. Introduction
Integration tests are test cases that test highly coupled external services. A great example of this is services in a SOA environment. In this scheme we will create services (or micro services) that are usually deployed on a different container and only exposed specific implementation of it’s own, consumed by a more sophisticated system.
By rule of thumb, we always need to separate this kind of tests from the internal service of the application. This separation, in JUnit Test case perspective, is called “categorising”, a pretty straight forward definition, we categorise a specific test case by creating a mark on them using Java Interface class. In this example, I’ll be giving a simple example of how we can write and categorise test cases by using the@Category annotation.
2. Source
The following codes are the source codes made for this example. Link to this project can be found at the end of this article.
2.1 Java Test Interface
We first need to mark our test cases. This is for us to categorise the test case that it’s an Integration tests.
IntegrationTest.java
package com.areyes1.jgc.junit.integ;public interface IntegrationTest {}2.2 Test Case
After that, we will use the interface class to mark our test case as an Integration test.
JUnitAssertExampleTests.java
package com.areyes1.jgc.junit.integ;import org.junit.Before;import org.junit.Test;import org.junit.experimental.categories.Category;import com.areyes1.jgc.junit.integ.JUnitAssertEqualsServiceExample;import com.areyes1.jgc.junit.integ.ServiceObject;import static org.junit.Assert.assertEquals;@Category(IntegrationTest.class)public class IntegrationTestSampleTest {private JUnitAssertEqualsServiceExample junitAssertEqualsServiceSample;private ServiceObject serviceObject;@Beforepublic void setData() {serviceObject = new ServiceObject();junitAssertEqualsServiceSample = new JUnitAssertEqualsServiceExample();junitAssertEqualsServiceSample.initiateMetaData(serviceObject);}@Testpublic void testAssertEqualsFalse() {//processed the itemServiceObject newServiceObject = new ServiceObject();junitAssertEqualsServiceSample.initiateMetaData(newServiceObject);junitAssertEqualsServiceSample.processObject(serviceObject);assertEquals(serviceObject,newServiceObject);}@Testpublic void testAssertEquals() {junitAssertEqualsServiceSample.processObject(serviceObject);assertEquals(serviceObject,this.serviceObject);}@Testpublic void testAssertEqualsWithMessage() {junitAssertEqualsServiceSample.processObject(serviceObject);assertEquals("Same Object",serviceObject,serviceObject);}@Testpublic void testAssertEqualsFalseWithMessage() {ServiceObject newServiceObject = new ServiceObject();junitAssertEqualsServiceSample.postProcessing(serviceObject);assertEquals("Not the Same Object",newServiceObject,serviceObject);}}2.3 Maven Config
To ensure that this class will only be executed upon running the integration-test, we need to add the following configuration on our pom.xml
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<build><plugins><plugin><artifactId>maven-failsafe-plugin</artifactId><version>2.12</version><dependencies><dependency><groupId>org.apache.maven.surefire</groupId><artifactId>surefire-junit47</artifactId><version>2.12</version></dependency></dependencies><configuration><groups>com.areyes1.jgc.junit.integ.IntegrationTest</groups></configuration><executions><execution><goals><goal>integration-test</goal></goals><configuration><includes><include>**/*.class</include></includes></configuration></execution></executions></plugin></plugins></build>
We added the configuration that all test cases, which are categorised under Integrate test, will be part of the integration-test goal.
2.4 Maven command
Run the following: mvn integration-test
3. Output
Here’s the output of our log file:
------------------------------------------------------- T E S T S-------------------------------------------------------Running com.areyes1.jgc.junit.integ.IntegrationTestSampleTestTests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.073 secResults:Tests run: 4, Failures: 0, Errors: 0, Skipped: 0[INFO] ------------------------------------------------------------------------[INFO] BUILD SUCCESS[INFO] ------------------------------------------------------------------------[INFO] Total time: 1.843 s[INFO] Finished at: 2015-08-27T18:54:16+08:00[INFO] Final Memory: 9M/107M[INFO] ------------------------------------------------------------------------
4. Download the Eclipse project
This was an example of JUnit Integration Tests.
You can download the full source code of this example here:junit-integration-tests
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