如果 JUnit 覆盖率低于特定阈值，如何使 Maven 构建失败

Question

我正在从声纳休息处获取单元测试覆盖率指标 api。

如果构建低于定义值，我如何才能使构建失败？

Answer 1

JaCoCo 提供该功能。

具有配置规则的 JaCoCo

使用配置规则定义 JaCoCo 插件 COVEREDRATIO for LINE and BRANCH :

<plugin>
  <groupId>org.jacoco</groupId>
  <artifactId>jacoco-maven-plugin</artifactId>
  <version>0.7.7.201606060606</version>
  <executions>
    <execution>
      <id>default-prepare-agent</id>
      <goals>
        <goal>prepare-agent</goal>
      </goals>
    </execution>
    <execution>
      <id>check</id>
      <goals>
          <goal>check</goal>
      </goals>
      <configuration>
        <rules>
          <rule>
            <element>CLASS</element>
            <limits>
              <limit>
                <counter>LINE</counter>
                <value>COVEREDRATIO</value>
                <minimum>0.80</minimum>
              </limit>
              <limit>
                <counter>BRANCH</counter>
                <value>COVEREDRATIO</value>
                <minimum>0.80</minimum>
              </limit>
            </limits>
            <excludes>
              <exclude>com.xyz.ClassToExclude</exclude>
            </excludes>
          </rule>
        </rules>
      </configuration>
    </execution>
  </executions>
</plugin>

多种选择

支持的 counter 选项是：

• 线
• 分支机构
• 说明
• 复杂性
• 方法
• CLASS

我相信 INSTRUCTION 可以让您进行一般检查（例如验证整个项目至少有 0.80 的覆盖率）。

Example with INSTRUCTION - overall instruction coverage of 80%

This example requires an overall instruction coverage of 80% and no class must be missed:

<rules>
  <rule implementation="org.jacoco.maven.RuleConfiguration">
    <element>BUNDLE</element>
    <limits>
      <limit implementation="org.jacoco.report.check.Limit">
        <counter>INSTRUCTION</counter>
        <value>COVEREDRATIO</value>
        <minimum>0.80</minimum>
      </limit>
      <limit implementation="org.jacoco.report.check.Limit">
        <counter>CLASS</counter>
        <value>MISSEDCOUNT</value>
        <maximum>0</maximum>
      </limit>
    </limits>
  </rule>
</rules>

失败消息

如果覆盖范围不符合预期，则会失败并显示以下消息：

[WARNING] Rule violated for class com.sampleapp.SpringConfiguration: lines covered ratio is 0.00, but expected minimum is 0.80
[WARNING] Rule violated for class com.sampleapp.Launcher: lines covered ratio is 0.33, but expected minimum is 0.80
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------

排除项

在上面的例子中，我设置了<exclude>com.xyz.ClassToExclude</exclude>。我认为您会发现需要添加许多排除项。项目通常包含许多 类 而不是 testable/tested（Spring 配置，Java bean...）。您也可以使用正则表达式。

---

来源：

• http://choudhury.com/blog/2014/02/25/enforcing-minimum-code-coverage
• http://www.eclemma.org/jacoco/trunk/doc/maven.html
• http://www.eclemma.org/jacoco/trunk/doc/check-mojo.html

Answer 2

Specify the datFile location if it is not under default folder.

<execution>
                <id>check</id>
                <goals>
                    <goal>check</goal>
                </goals>
                <configuration>
                  <dataFile><path-to-jacoc-ut.exec></dataFile>
                 <rules><rule>
                 <element>CLASS</element>
                 <limits>
                  <limit>
                    <counter>LINE</counter>
                    <value>COVEREDRATIO</value>
                    <minimum>0.80</minimum>
                  </limit>
                  <limit>
                    <counter>BRANCH</counter>
                    <value>COVEREDRATIO</value>
                    <minimum>0.80</minimum>
                  </limit>
                </limits>
                <excludes>
                   <exclude>com.xyz.ClassToExclude</exclude>
                </excludes>
              </rule></rules></configuration>
            </execution>

Answer 3

如果您使用的是 0.8.2 或类似版本的 jacoco-maven-plugin，请确保已定义数据文件，并对插件使用以下配置。

<execution>
  <id>jacoco-check</id>
  <goals>
    <goal>check</goal>
  </goals>
  <configuration>
    <dataFile>${project.build.directory}/coverage-reports/jacoco.exec</dataFile>
    <rules>
      <rule>
        <element>BUNDLE</element>
        <limits>
          <limit>
            <counter>INSTRUCTION</counter>
            <value>COVEREDRATIO</value>
            <minimum>0.17</minimum>
          </limit>
        </limits>
      </rule>
    </rules>
  </configuration>
</execution>

此代码确保整体覆盖率达到 17%。

请使用

验证这一点

mvn clean verify

命令。