Gather code coverage data for integration tests in maven-invoker-plugin

.gitignore

@@ -7,3 +7,7 @@ target/
 
 # JVM agent descriptors
 .attach*
+
+# Stuff that I generate when I have lost all hope in the world
+/build.log
+

README.md

@@ -1,6 +1,6 @@
 ![Java 11+](https://img.shields.io/badge/Java-11+-blue?logo=openjdk&logoColor=white)
 [![Build Status](https://github.com/ascopes/protobuf-maven-plugin/actions/workflows/build.yml/badge.svg?branch=main)](https://github.com/ascopes/protobuf-maven-plugin/actions/workflows/build.yml)
-<!--[![codecov](https://codecov.io/gh/ascopes/protobuf-maven-plugin/graph/badge.svg?token=bW37uc04cL)](https://codecov.io/gh/ascopes/protobuf-maven-plugin)-->
+[![codecov](https://codecov.io/gh/ascopes/protobuf-maven-plugin/graph/badge.svg?token=bW37uc04cL)](https://codecov.io/gh/ascopes/protobuf-maven-plugin)
 
 # protobuf-maven-plugin
 

pom.xml

@@ -340,12 +340,8 @@
 
         <configuration>
           <addTestClassPath>true</addTestClassPath>
-          <cloneClean>true</cloneClean>
-          <cloneProjectsTo>${project.build.directory}/it/tests</cloneProjectsTo>
           <failIfNoProjects>true</failIfNoProjects>
-          <localRepositoryPath>${project.build.directory}/it/m2</localRepositoryPath>
           <postBuildHookScript>test</postBuildHookScript>
-          <settingsFile>src/it/settings.xml</settingsFile>
           <showErrors>true</showErrors>
           <showVersion>true</showVersion>
           <streamLogsOnFailures>true</streamLogsOnFailures>
@@ -519,27 +515,36 @@
 
         <executions>
           <execution>
-            <id>generate-coverage-argline</id>
+            <id>prepare-coverage-agent-surefire</id>
             <phase>initialize</phase>
             <goals>
               <goal>prepare-agent</goal>
             </goals>
+          </execution>
 
+          <execution>
+            <id>prepare-coverage-agent-invoker</id>
+            <phase>initialize</phase>
+            <goals>
+              <goal>prepare-agent-integration</goal>
+            </goals>
             <configuration>
-              <destFile>${project.build.directory}/jacoco.bin</destFile>
+              <!-- Append to ensure multiple invoker test calls are included -->
+              <append>true</append>
+              <!-- Ensure `${invoker.mavenOpts}` is set in the invoker.properties as well
+                  if maven.argLine is overridden. -->
+              <includes>io.github.ascopes.protobufmavenplugin.*</includes>
+              <propertyName>invoker.mavenOpts</propertyName>
             </configuration>
           </execution>
 
           <execution>
-            <id>generate-coverage-report</id>
-            <phase>test</phase>
+            <id>generate-coverage-reports</id>
             <goals>
               <goal>report</goal>
+              <goal>report-integration</goal>
+              <goal>report-aggregate</goal>
             </goals>
-            <configuration>
-              <dataFile>${project.build.directory}/jacoco.bin</dataFile>
-              <outputDirectory>${project.build.directory}/site/jacoco</outputDirectory>
-            </configuration>
           </execution>
         </executions>
       </plugin>

src/it/invoker.properties

@@ -1,4 +1,5 @@
 invoker.mavenOpts = \
   -Dplugin-group-id=${project.groupId} \
   -Dplugin-artifact-id=${project.artifactId} \
-  -Dplugin-version=${project.version}
+  -Dplugin-version=${project.version} \
+  ${invoker.mavenOpts}