SCT-18 update build to support sonar

resolves spring-cloud/spring-cloud-task#18

pom.xml

@@ -31,6 +31,7 @@
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<sonar.jacoco.reportPath>${project.build.directory}/coverage-reports/jacoco-ut.exec</sonar.jacoco.reportPath>
 	</properties>
 
 	<build>
@@ -43,6 +44,7 @@
 					<includes>
 						<include>**/*Tests.java</include>
 					</includes>
+					<argLine>${surefireArgLine}</argLine>
 				</configuration>
 			</plugin>
 			<plugin>
@@ -59,6 +61,49 @@
 				<artifactId>maven-javadoc-plugin</artifactId>
 				<version>2.10.3</version>
 			</plugin>
+			<plugin>
+				<groupId>org.jacoco</groupId>
+				<artifactId>jacoco-maven-plugin</artifactId>
+				<version>0.7.5.201505241946</version>
+				<executions>
+					<!--
+						Prepares the property pointing to the JaCoCo runtime agent which
+						is passed as VM argument when Maven the Surefire plugin is executed.
+					-->
+					<execution>
+						<id>pre-unit-test</id>
+						<goals>
+							<goal>prepare-agent</goal>
+						</goals>
+						<configuration>
+							<!-- Sets the path to the file which contains the execution data. -->
+							<destFile>${project.build.directory}/coverage-reports/jacoco-ut.exec</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>${project.build.directory}/coverage-reports/jacoco-ut.exec</dataFile>
+							<!-- Sets the output directory for the code coverage report. -->
+							<outputDirectory>${project.reporting.outputDirectory}/jacoco-ut</outputDirectory>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
 		</plugins>
 	</build>