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Maven Configuration for Coverage

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From MUnit 2.x and later, the coverage report goal is integrated with the Maven reporting section. MUnit generates coverage reports during the Maven site lifecycle, during the coverage-report goal.

The following configurations apply if you execute your MUnit tests using the Maven plugin. They don’t apply when running tests from Anypoint Code Builder or Anypoint Studio.

MUnit Coverage - Sample Maven configuration
<plugin>
    <groupId>com.mulesoft.munit.tools</groupId>
    <artifactId>munit-maven-plugin</artifactId>
    <version>${munit.version}</version>

    <executions>
        <execution>
            <id>test</id>
            <phase>test</phase>
            <goals>
                <goal>test</goal>
                <goal>coverage-report</goal>
            </goals>
        </execution>
    </executions>

    <configuration>
        <coverage>
            <runCoverage>true</runCoverage>
            <failBuild>false</failBuild>

            <requiredApplicationCoverage>75</requiredApplicationCoverage>
            <requiredResourceCoverage>50</requiredResourceCoverage>
            <requiredFlowCoverage>50</requiredFlowCoverage>

            <formats>
                <format>console</format>
                <format>html</format>
            </formats>
        </coverage>
    </configuration>
</plugin>

Coverage Report Types

When you enable MUnit Coverage, the console displays a summary report.

===============================================================================
MUnit Coverage Summary
===============================================================================
 * Resources: 2 - Flows: 3 - Processors: 4
 * Application Coverage: 75.00%
====================================================================================

MUnit Coverage offers four types of reports:

  • Console report
    The console report prints in the console. It works with the summary report and shows an overview of the MUnit run, with a count of all resources, flows, and processors, as well as the overall application coverage level, and warnings and errors if any.

  • HTML report
    The HTML report shows the same information as the console report but is formatted to fit any web browser. It’s available in the ${application.path}/target/site/munit/coverage/ path.

  • JSON report
    The JSON report provides the same information as the HTML report but in a JSON format. It’s available at ${application.path}/target/site/munit/coverage/munit-coverage.json.

  • SONAR report
    The SONAR report shows the same information as the HTML report, in a SonarQube format.

To enable the report generation, add the following configuration:

MUnit Coverage - Report Configuration
<coverage>
    <runCoverage>true</runCoverage>

    <formats>
        <format>console</format> (1)
        <format>html</format>    (2)
        <format>json</format>    (3)
        <format>sonar</format>   (4)
    </formats>
</coverage>
1 Console report
2 HTML report
3 JSON report
4 SONAR report

You can choose to have either none, one, or all the report types added to your configuration.

To configure, for example, the JSON report generation, add the following configuration to your pom.xml file:

<coverage>
    <runCoverage>true</runCoverage>

    <formats>
        <format>json</format>
    </formats>
</coverage>

Set up a Minimum Coverage Level

One of the features of MUnit Coverage is to fail the build if a certain coverage level isn’t reached.

MUnit Coverage handles three different levels:

  • Application: The overall coverage of all your application.

  • Resource: The coverage level of each Mule configuration file.

  • Flow: The coverage of event processors in each flow.

To define the required coverage levels:

MUnit Coverage - Require Coverage
<coverage>
    <runCoverage>true</runCoverage>
    <failBuild>true</failBuild>

    <requiredApplicationCoverage>75</requiredApplicationCoverage> (1)
    <requiredResourceCoverage>50</requiredResourceCoverage>
    <requiredFlowCoverage>50</requiredFlowCoverage>
</coverage>
1 Each value represents a percentage.
If a percentage isn’t defined, it defaults to -1, which sets no requirements for said level so the build doesn’t fail due to low coverage.

If you define coverage levels but set the property failBuild to false, and then the levels aren’t reached, a warning shows up in the MUnit Coverage summary:

===============================================================================
MUnit Coverage Summary
===============================================================================
 * Resources: 2 - Flows: 3 - Processors: 4
 * Application Coverage: 75.00%

----------------------------- WARNING --------------------------------------
 * Flow: file2.xml -> file2Flow1 coverage is below defined limit. Required: 50.0% - Current: 00.00% (1)
====================================================================================
1 Warning detailing which coverage level isn’t met, and where it happens.

Ignore a Flow or a File

You can also ignore a flow or a file. This way, the ignored resource:

  • Does not count as coverage data.

  • Does not affect the overall number of message processors.

  • Does not cause a build to fail if the flow isn’t tested or if the flow doesn’t reach coverage metrics.

To ignore flows and files:

MUnit Coverage - Ignore flows and files
<coverage>
    <runCoverage>true</runCoverage>
    <failBuild>true</failBuild>

    <requiredApplicationCoverage>100</requiredApplicationCoverage>
    <requiredResourceCoverage>100</requiredResourceCoverage>
    <requiredFlowCoverage>100</requiredFlowCoverage>

    <ignoreFlows>
        <ignoreFlow>flow-1</ignoreFlow>
        <ignoreFlow>flow-2</ignoreFlow>
        ...
        <ignoreFlow>flow-n</ignoreFlow>
    </ignoreFlows>

    <ignoreFiles>
        <ignoreFile>mule-config-1.xml</ignoreFile>
        <ignoreFile>mule-config-2.xml</ignoreFile>
        ...
        <ignoreFile>mule-config-n.xml</ignoreFile>
    </ignoreFiles>
</coverage>

See Also