Fix neg test case

pmd-test/src/main/java/net/sourceforge/pmd/AbstractLanguageVersionTest.java

@@ -24,7 +24,7 @@ import net.sourceforge.pmd.util.ResourceLoader;
 /**
  * Base test class for {@link LanguageVersion} implementations. <br>
  * Each language implementation should subclass this and provide a data method.
- * 
+ *
  * <pre>
  * &#64;Parameters
  *     public static Collection&lt;Object[]&gt; data() {
@@ -39,7 +39,7 @@ import net.sourceforge.pmd.util.ResourceLoader;
  *              null }
  *       });
  * </pre>
- * 
+ *
  * <p>For the parameters, see the constructor
  * {@link #AbstractLanguageVersionTest(String, String, String, LanguageVersion)}.</p>
  */
@@ -54,7 +54,7 @@ public class AbstractLanguageVersionTest {
 
     /**
      * Creates a new {@link AbstractLanguageVersionTest}
-     * 
+     *
      * @param name
      *            the name under which the language module is registered
      * @param terseName
@@ -105,7 +105,7 @@ public class AbstractLanguageVersionTest {
 
     /**
      * Makes sure, that for each language a "categories.properties" file exists.
-     * 
+     *
      * @throws Exception
      *             any error
      */
@@ -127,7 +127,7 @@ public class AbstractLanguageVersionTest {
 
     /**
      * If a rulesets.properties file still exists, test it as well.
-     * 
+     *
      * @throws Exception
      *             any error
      */
@@ -153,6 +153,9 @@ public class AbstractLanguageVersionTest {
 
     @Test
     public void testVersionsAreDistinct() {
+        if (expected == null) {
+            return;
+        }
 
         Language lang = expected.getLanguage();