Migrated EvaluationTestCase (and all tests depending on it) to JUnit 4.

--
MOS_MIGRATED_REVID=109064201
diff --git a/src/test/java/com/google/devtools/build/lib/syntax/SkylarkEvaluationTest.java b/src/test/java/com/google/devtools/build/lib/syntax/SkylarkEvaluationTest.java
index 1412c5a..59ba5c3 100644
--- a/src/test/java/com/google/devtools/build/lib/syntax/SkylarkEvaluationTest.java
+++ b/src/test/java/com/google/devtools/build/lib/syntax/SkylarkEvaluationTest.java
@@ -40,8 +40,9 @@
  */
 @RunWith(JUnit4.class)
 public class SkylarkEvaluationTest extends EvaluationTest {
+
   @Before
-  public void setup() throws Exception {
+  public final void setup() throws Exception {
     setMode(TestMode.SKYLARK);
   }