Migrated tests in lib/analysis to JUnit 4.

--
MOS_MIGRATED_REVID=108862983
diff --git a/src/test/java/com/google/devtools/build/lib/analysis/MakeVariableExpanderTest.java b/src/test/java/com/google/devtools/build/lib/analysis/MakeVariableExpanderTest.java
index 6f7d164..d5eb541 100644
--- a/src/test/java/com/google/devtools/build/lib/analysis/MakeVariableExpanderTest.java
+++ b/src/test/java/com/google/devtools/build/lib/analysis/MakeVariableExpanderTest.java
@@ -37,7 +37,7 @@
   private Map<String, String> vars = new HashMap<>();
 
   @Before
-  public void setUp() throws Exception {
+  public final void createContext() throws Exception  {
     context = new MakeVariableExpander.Context() {
         @Override
         public String lookupMakeVariable(String name)