Updating build.xml and phpunit.xml to add and run API unit tests suite

build.xml

@@ -123,7 +123,10 @@
 
  <target name="phpunit" description="Run unit tests with PHPUnit">
   <exec executable="phpunit">
-    <arg path="${basedir}/workflow/engine/src" />
+    <arg value="--testsuite" />
+    <arg path="api" />
+    <arg value="--bootstrap" />
+    <arg path="${basedir}/workflow/engine/src/Tests/bootstrap.php" />
   </exec>
  </target>
 

phpunit.xml

@@ -20,6 +20,9 @@
             <directory>./tests/unit/</directory>
         </testsuite>
 -->
+        <testsuite name="api">
+            <directory>./workflow/engine/src/</directory>
+        </testsuite>
     </testsuites>
 
 <!--     <filter>