Gradle精选: 关于运行失败的单元测试CASE，显示更多相关信息
在Gradle中运行单元测试很简单。一般情况下，如果有一个单元测试CASE执行失败，也会导致构建失败。但是我们却不能立刻在控制台看到为什么这个单元测试失败。我们需要先打开生成的HTML格式的测试报告。现在我们还有其他办法。 首先，我们创建一个下面的Gradle build文件： // File: build.gradle apply plugin: 'java' repositories { mavenCentral() } dependencies { testCompile 'junit:junit:[4,)' } 然后，我们使用下面的Junit单元测试。注意，这个单元测试一直会失败，因为这就是我们想要的CASE场景。 // File: src/test/java/com/mrhaki/gradle/SampleTest.java package com.mrhaki.gradle; import org.junit.*; public class SampleTest { @Test public void sample() { Assert.assertEquals("Gradle is gr8", "Gradle is great"); } } 我们通过执行test任务，来运行单元测试。如果我们运行这个任务，我们发现控制台显示哪一行单元测试失败了，但是我们却看不到单元测试失败的具体原因: $ gradle test :compileJava UP-TO-DATE :processResources UP-TO-DATE :classes UP-TO-DATE :compileTestJava :processTestResources UP-TO-DATE :testClasses :test com.mrhaki.gradle.SampleTest > sample FAILED org.junit.ComparisonFailure at SampleTest.java:8 1 test completed, 1 failed :test FAILED FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':test'. > There were failing tests. See the report at: file:///Users/mrhaki/Projects/mrhaki.com/blog/posts/samples/gradle/testlogging/build/reports/tests/index.html * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. BUILD FAILED Total time: 4.904 secs 我们可以再次运行test任务，但是现在我们通过添加命令行选项-i 或者 --info来设置Gradle日志级别到info。现在我们可以在终端看到单元测试失败的具体原因了。 $ gradle test -i Starting Build Settings evaluated using empty settings script. Projects loaded. Root project using build file ... Successfully started process 'Gradle Worker 1' Gradle Worker 1 executing tests. Gradle Worker 1 finished executing tests. com.mrhaki.gradle.SampleTest > sample FAILED org.junit.ComparisonFailure: expected:<gradle is gr[8]> but was:<gradle is gr[eat]> at org.junit.Assert.assertEquals(Assert.java:115) at org.junit.Assert.assertEquals(Assert.java:144) at com.mrhaki.gradle.SampleTest.sample(SampleTest.java:8) Process 'Gradle Worker 1' finished with exit value 0 (state: SUCCEEDED) 1 test completed, 1 failed Finished generating test XML results (0.025 secs) Generating HTML test report... Finished generating test html results (0.027 secs) :test FAILED FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':test'. > There were failing tests. See the report at: file:///Users/mrhaki/Projects/mrhaki.com/blog/posts/samples/gradle/testlogging/build/reports/tests/index.html * Try: Run with --stacktrace option to get the stack trace. Run with --debug option to get more log output. BUILD FAILED Total time: 5.117 secs 但是这样做仍然会产生很多干扰的日志。最好的办法就是通过配置test任务来自定义单元测试日志级别。我们可以配置不同的日志级别。为了获取单元测试失败的具体原因我们可以仅仅将exceptionFormat设置为full。示例如下： // File: build.gradle apply plugin: 'java' repositories { mavenCentral() } dependencies { testCompile 'junit:junit:[4,)' } test { testLogging { exceptionFormat = 'full' } } 我们可以再次运行test任务，并且使用正常的日志级别，但是这次，我们依然能够看到单元测试失败的具体原因，而没有其他的干扰日志。 $ gradle test :compileJava UP-TO-DATE :processResources UP-TO-DATE :classes UP-TO-DATE :compileTestJava UP-TO-DATE :processTestResources UP-TO-DATE :testClasses UP-TO-DATE :test com.mrhaki.gradle.SampleTest > sample FAILED org.junit.ComparisonFailure: expected:<gradle is gr[8]> but was:<gradle is gr[eat]> at org.junit.Assert.assertEquals(Assert.java:115) at org.junit.Assert.assertEquals(Assert.java:144) at com.mrhaki.gradle.SampleTest.sample(SampleTest.java:8) 1 test completed, 1 failed :test FAILED FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':test'. > There were failing tests. See the report at: file:///Users/mrhaki/Projects/mrhaki.com/blog/posts/samples/gradle/testlogging/build/reports/tests/index.html * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. BUILD FAILED Total time: 5.906 secs 实例使用 Gradle 1.6 编写。 联系方式 Email：yanghui1986527#gmail.com Github: https://github.com/snowdream Blog: http://snowdream.github.io/blog/ 简书：http://www.jianshu.com/u/748f0f7e6432 云栖博客：https://yq.aliyun.com/u/snowdream86 QQ群: 529327615 微信公众号: sn0wdr1am
