add a test for running the plugin under 2.11

Author: maiflai

src/functionalTest/java/org.scoverage/ScalaSingleModuleTest.java

@@ -133,6 +133,15 @@ public void reportScoverageWithoutNormalCompilationAndWithExcludedClasses() thro
         Assert.assertFalse(resolve(buildDir(), "classes/scala/scoverage/org/hello/World.class").exists());
     }
 
+    @Test
+    public void reportScoverageUnder2_11() throws Exception {
+        run("clean", ScoveragePlugin.getREPORT_NAME(),
+                "-PscalaVersionMinor=11",
+                "-PscalaVersionBuild=8",
+                "-Pscoverage.scoverageScalaVersion=2_11");
+        assertReportFilesExist();
+    }
+
     private void assertReportFilesExist() {
 
         Assert.assertTrue(resolve(reportDir(), "index.html").exists());