Merge pull request jenkinsci#618 from MarkEWaite/throw-exception-on-t…

…est-exit

Throw GitException as expected in GitClientTest

src/test/java/org/jenkinsci/plugins/gitclient/GitClientTest.java

@@ -2569,7 +2569,7 @@ public void testgetRemoteSymbolicReferences_with_non_default_HEAD() throws Excep
     @Test(expected = GitException.class)
     public void testgetRemoteSymbolicReferences_URI_Syntax() throws Exception {
         if (!CLI_GIT_SUPPORTS_SYMREF) {
-            return;
+            throw new GitException("Skipping JGit tests in testgetRemoteSymbolicReferences_URI_Syntax");
         }
         gitClient.getRemoteSymbolicReferences("error: invalid repo URL", Constants.HEAD);
     }