将JaCoCo从离线改为在线，但仍未看到其他模块中的课程覆盖范围

Question

我有一个大型Maven多模块项目构建。我将使用PowerMock和Jacoco0.7.8以及离线检测从所有测试开始。

尽管这些被称为“单元测试”，但对一个模块中的类的测试确实会调用其他模块中的重要代码。因此，当我们查看生成的报告时，我们看到了与测试相同的模块中的类的复盖率，但我们看不到测试期间执行的其他模块中的类的复盖率。

我的假设是，如果我能够将其更改为使用在线检测，那么得到的覆盖率报告将包括来自当前模块之外的其他模块的类。

构建完成后，我在浏览器中打开了“target/site/jacoco/index.html”文件，发现它只包括当前模块和单个类的覆盖范围。

同样奇怪的是，我粗略地检查了生成的“jacoco.exec”文件。我注意到它肯定比我习惯从其他仍然使用离线仪器的模块看到的要大。我没有任何方法来解释文件的格式，但我确实尝试简单地“cat”文件，只是为了看看我能看到什么。我在测试正在执行的其他模块中看到了表示类名的字符串。

所以，看起来在线检测至少是为其他模块中的类记录数据，但结果报告并没有显示这一点。

以下是“Effective-POM”输出的节选：

  <plugin>
    <groupId>org.jacoco</groupId>
    <artifactId>jacoco-maven-plugin</artifactId>
    <version>0.7.8</version>
    <executions>
      <execution>
        <id>default-instrument</id>
        <phase>none</phase>
        <goals>
          <goal>instrument</goal>
        </goals>
      </execution>
      <execution>
        <id>default-restore-instrumented-classes</id>
        <phase>none</phase>
        <goals>
          <goal>restore-instrumented-classes</goal>
        </goals>
      </execution>
      <execution>
        <id>default-report</id>
        <phase>prepare-package</phase>
        <goals>
          <goal>report</goal>
        </goals>
      </execution>
      <execution>
        <id>prepare-agent</id>
        <goals>
          <goal>prepare-agent</goal>
        </goals>
      </execution>
    </executions>
  </plugin>
  <plugin>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>2.19.1</version>
    <executions>
      <execution>
        <id>default-test</id>
        <phase>test</phase>
        <goals>
          <goal>test</goal>
        </goals>
        <configuration>
          <argLine>@{argLine} -Xmx1024m</argLine>
          <includes>
            <include>**/*Test.java</include>
          </includes>
          <systemPropertyVariables>
            <running-unit-test>true</running-unit-test>
            <jacoco-agent.destfile>...\target/jacoco.exec</jacoco-agent.destfile>
          </systemPropertyVariables>
        </configuration>
      </execution>
    </executions>
    <configuration>
      <argLine>@{argLine} -Xmx1024m</argLine>
      <includes>
        <include>**/*Test.java</include>
      </includes>
      <systemPropertyVariables>
        <running-unit-test>true</running-unit-test>
        <jacoco-agent.destfile>...\target/jacoco.exec</jacoco-agent.destfile>
      </systemPropertyVariables>
    </configuration>
  </plugin>

请注意，用于脱机检测的执行具有阶段“none”，因此不使用它们，并且我还设置了“jacoco-agent.destfile”属性，该属性仅用于脱机检测。

Answer 1

Goalreport仅对当前模块中的类执行分析，并创建仅包含这些类的报表，即使为其他类记录了数据。和目标报告-聚合

Reactor内多个项目的覆盖报告

（例如见下文）

package example;

class A {
  // to be tested in module "a"
  void a() {
    System.out.println("A_a" + fun());
  }

  // to be tested in module "b"
  void b() {
    System.out.println("A_b" + fun());
  }

  // to be mocked by PowerMockito
  static String fun() {
    return "";
  }
}

package example;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

@PrepareForTest({A.class})
@RunWith(PowerMockRunner.class)
public class ATest {
  @Test
  public void test() {
    PowerMockito.mockStatic(A.class);
    Mockito.when(A.fun()).thenReturn("fun");

    new A().a();
  }
}

package example;

class B {
  // to be tested in module "b"
  void b() {
    System.out.println("B_b" + fun());
  }

  // to be mocked by PowerMockito
  static String fun() {
    return "";
  }
}

package example;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

@PrepareForTest({A.class, B.class})
@RunWith(PowerMockRunner.class)
public class BTest {
  @Test
  public void test() {
    PowerMockito.mockStatic(A.class);
    Mockito.when(A.fun()).thenReturn("fun");

    PowerMockito.mockStatic(B.class);
    Mockito.when(B.fun()).thenReturn("fun");

    new A().b();
    new B().b();
  }
}

a/pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <parent>
    <groupId>org.example</groupId>
    <artifactId>example</artifactId>
    <version>1.0-SNAPSHOT</version>
  </parent>

  <artifactId>a</artifactId>
</project>

b/pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <parent>
    <groupId>org.example</groupId>
    <artifactId>example</artifactId>
    <version>1.0-SNAPSHOT</version>
  </parent>

  <dependencies>
    <dependency>
      <groupId>org.example</groupId>
      <artifactId>a</artifactId>
      <version>${project.version}</version>
    </dependency>
  </dependencies>

  <artifactId>b</artifactId>
</project>

report/pom.xml用于跨模块的覆盖率聚合：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <parent>
    <groupId>org.example</groupId>
    <artifactId>example</artifactId>
    <version>1.0-SNAPSHOT</version>
  </parent>

  <artifactId>report</artifactId>
  <packaging>pom</packaging>

  <dependencies>
    <dependency>
      <groupId>org.example</groupId>
      <artifactId>a</artifactId>
      <version>${project.version}</version>
    </dependency>
    <dependency>
      <groupId>org.example</groupId>
      <artifactId>b</artifactId>
      <version>${project.version}</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.jacoco</groupId>
        <artifactId>jacoco-maven-plugin</artifactId>
        <executions>
          <execution>
            <id>report</id>
            <phase>prepare-package</phase>
            <goals>
              <goal>report-aggregate</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

最后是最重要的部分-pom.xml，在这里发生了所有神奇的事情：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>

  <groupId>org.example</groupId>
  <artifactId>example</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>pom</packaging>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>

    <jacoco.version>0.7.9</jacoco.version>
    <powermock.version>1.6.6</powermock.version>
  </properties>

  <modules>
    <module>a</module>
    <module>b</module>
  </modules>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.8.2</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.powermock</groupId>
      <artifactId>powermock-module-junit4</artifactId>
      <version>${powermock.version}</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.powermock</groupId>
      <artifactId>powermock-api-mockito</artifactId>
      <version>${powermock.version}</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        <version>3.0.2</version>
      </plugin>
    </plugins>
  </build>

  <profiles>
    <profile>
      <id>coverage</id>
      <modules>
        <module>report</module>
      </modules>
      <dependencies>
        <dependency>
          <groupId>org.jacoco</groupId>
          <artifactId>org.jacoco.agent</artifactId>
          <classifier>runtime</classifier>
          <version>${jacoco.version}</version>
          <scope>test</scope>
        </dependency>
      </dependencies>
      <build>
        <plugins>
          <plugin>
            <groupId>org.jacoco</groupId>
            <artifactId>jacoco-maven-plugin</artifactId>
            <version>${jacoco.version}</version>
            <executions>
              <execution>
                <id>instrument</id>
                <phase>process-classes</phase>
                <goals>
                  <goal>instrument</goal>
                </goals>
              </execution>
              <execution>
                <id>report</id>
                <!--
                restore original classes before generation of report,
                but after packaging of JAR:
                -->
                <phase>post-integration-test</phase>
                <goals>
                  <goal>restore-instrumented-classes</goal>
                  <goal>report</goal>
                </goals>
              </execution>
            </executions>
          </plugin>
          <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.12.2</version>
            <configuration>
              <systemPropertyVariables>
                <jacoco-agent.destfile>target/jacoco.exec</jacoco-agent.destfile>
              </systemPropertyVariables>
            </configuration>
          </plugin>
        </plugins>
      </build>
    </profile>
  </profiles>
</project>

在这样设置中

mvn clean verify -Pcoverage

null

mvn package -DskiptTests -Dmaven.jar.forceCreation

<profile>
  <id>coverage</id>
  <modules>
    <module>report</module>
  </modules>
  <build>
    <plugins>
      <plugin>
        <groupId>org.jacoco</groupId>
        <artifactId>jacoco-maven-plugin</artifactId>
        <version>${jacoco.version}</version>
        <executions>
          <execution>
            <goals>
              <goal>prepare-agent</goal>
              <goal>report</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</profile>