compiler: add JaCoCo Maven plugin for test coverage

Wires up jacoco-maven-plugin 0.8.7 in the compiler module with prepare-agent and a report execution bound to the test phase.

Author: spullara

compiler/pom.xml

@@ -58,6 +58,25 @@
 
   <build>
     <plugins>
+      <plugin>
+        <groupId>org.jacoco</groupId>
+        <artifactId>jacoco-maven-plugin</artifactId>
+        <version>0.8.7</version>
+        <executions>
+          <execution>
+            <goals>
+              <goal>prepare-agent</goal>
+            </goals>
+          </execution>
+          <execution>
+            <id>report</id>
+            <phase>test</phase>
+            <goals>
+              <goal>report</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
       <plugin>
         <artifactId>maven-jar-plugin</artifactId>
         <executions>