How to make Maven unit test code coverage work
In Eclipse, I have used EcLEmma to see the unit test code coverage. Which worked fine. Therefore I have tried to use the JaCoCo plugin for Maven to see the same report with Surefire from Maven build, or even better, with a certain profile, or in the site cycle. Without success. All suggested solutions here didn't work for me.
What is the best way to get a unit test code coverage report (with surefire)?
[Edit] to be more specific why jacoco failed for me.... as I got always the Skipping JaCoCo execution due to missing execution data
from the pom in the properties
<jacoco.it.execution.data.file>${project.build.directory}/coverage-reports/jacoco-it.exec</jacoco.it.execution.data.file>
<jacoco.ut.execution.data.file>${project.build.directory}/coverage-reports/jacoco-ut.exec</jacoco.ut.execution.data.file>
in the Build section
<pluginManagement>
<plugins>
<plugin>
<groupId>org.eclipse.m2e</groupId>
<artifactId>lifecycle-mapping</artifactId>
<version>1.0.0</version>
<configuration>
<lifecycleMappingMetadata>
<pluginExecutions>
<pluginExecution>
<pluginExecutionFilter>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<versionRange>${jacoco.version}</versionRange>
<executions>
<!-- Prepares the property pointing to the JaCoCo runtime agent
which is passed as VM argument when Maven the Surefire plugin is executed. -->
<execution>
<id>pre-unit-test</id>
<goals>
<goal>prepare-agent</goal>
</goals>
<configuration>
<!-- Sets the path to the file which contains the execution
data. -->
<destFile>${jacoco.ut.execution.data.file}</destFile>
<!-- Sets the name of the property containing the settings for
JaCoCo runtime agent. -->
<propertyName>surefireArgLine</propertyName>
</configuration>
</execution>
<!-- Ensures that the code coverage report for unit tests is created
after unit tests have been run. -->
<execution>
<id>post-unit-test</id>
<phase>test</phase>
<goals>
<goal>report</goal>
</goals>
<configuration>
<!-- Sets the path to the file which contains the execution
data. -->
<dataFile>${jacoco.ut.execution.data.file}</dataFile>
<!-- Sets the output directory for the code coverage report. -->
<outputDirectory>${project.reporting.outputDirectory}/jacoco-ut</outputDirectory>
</configuration>
</execution>
<!-- Prepares the property pointing to the JaCoCo runtime agent
which is passed as VM argument when Maven the Failsafe plugin is executed. -->
<execution>
<id>pre-integration-test</id>
<phase>pre-integration-test</phase>
<goals>
<goal>prepare-agent</goal>
</goals>
<configuration>
<!-- Sets the path to the file which contains the execution
data. -->
<destFile>${jacoco.it.execution.data.file}</destFile>
<!-- Sets the name of the property containing the settings for
JaCoCo runtime agent. -->
<propertyName>failsafeArgLine</propertyName>
</configuration>
</execution>
<!-- Ensures that the code coverage report for integration tests
after integration tests have been run. -->
<execution>
<id>post-integration-test</id>
<phase>post-integration-test</phase>
<goals>
<goal>report</goal>
</goals>
<configuration>
<!-- Sets the path to the file which contains the execution
data. -->
<dataFile>${jacoco.it.execution.data.file}</dataFile>
<!-- Sets the output directory for the code coverage report. -->
<outputDirectory>${project.reporting.outputDirectory}/jacoco-it</outputDirectory>
</configuration>
</execution>
</executions>
</pluginExecutionFilter>
</pluginExecution>
</pluginExecutions>
</lifecycleMappingMetadata>
</configuration>
</plugin>
</plugins>
</pluginManagement>
was my last try but the pom becomes bigger and bigger without any result
which failes with
configuring report plugin org.apache.maven.plugins:maven-jxr-plugin:2.3
configuring report plugin org.jacoco:jacoco-maven-plugin:0.7.5.201505241946
Skipping JaCoCo execution due to missing execution data file:......\target\jacoco.exec
Skipping JaCoCo execution due to missing execution data file:......\target\jacoco-it.exec
.... => long project path
Answer
Thanks user3732793
Personnaly, I only needed to add this to my pom.xml
<project>
...
<dependencies>
...
</dependencies>
<build>
<plugins>
...
<!-- Code Coverage report generation -->
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.9</version>
<executions>
<execution>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>generate-code-coverage-report</id>
<phase>test</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
Then I am running
mvn test
and I get the HTML report under ./target/site/jacoco/*.html