jacoco 多個 module 運行 code coverage 測試

別不相信，就這麼簡單，如果運行不成功，那就是加入插件的parent pom.xml有可能是maven repsitry中的文件。
在parent pom.xml 中的<build>中加入如下的插件：

<plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.19.1</version>
                <configuration>
                    <skipTests>false</skipTests>
                </configuration>
            </plugin>
<plugin>
<!-- For integration test separation -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-failsafe-plugin</artifactId>
<version>2.19.1</version>
<dependencies>
    <dependency>
                     <groupId>org.apache.maven.surefire</groupId>
                        <artifactId>surefire-junit47</artifactId>
                        <version>2.19.1</version>
                    </dependency>
                </dependencies>
                <configuration>
                    <forkCount>4</forkCount>
                    <reuseForks>false</reuseForks>
                    <skip>true</skip>
                </configuration>
                <executions>
                    <execution>
                        <id>integration-test</id>
                        <goals>
                            <goal>integration-test</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>verify</id>
                        <goals>
                            <goal>verify</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.jacoco</groupId>
                <artifactId>jacoco-maven-plugin</artifactId>
                <version>0.7.9</version>
                <configuration>
                    <destFile>target/coverage-reports/jacoco-unit.exec</destFile>
                    <dataFile>target/coverage-reports/jacoco-unit.exec</dataFile>
                </configuration>
                <executions>
                    <execution>
                        <id>jacoco-initialize</id>
                        <goals>
                            <goal>prepare-agent</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>jacoco-site</id>
                        <phase>test</phase>
                        <goals>
                            <goal>report</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

maven-surefire-plugin中的skiptest設置爲false,用來運行單元測試。
jacoco中的Execution用來對應maven的goal,可以是test,verify。還有集成測試的選項。
運行 mvn clean test -Dmaven.test.failure.ignore=true
生成的report 在 target /site/jacoco下，導航到文件下，去查看index.html就是了。