Fix tests reproducibility.

Some tests instantiate an IndexSearcher in an @BeforeClass method. So we need
to reset the query cache in @BeforeClass too or they would use a shared cache.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1664053 13f79535-47bb-0310-9956-ffa450edef68

lucene/test-framework/src/java/org/apache/lucene/util/LuceneTestCase.java

@@ -1651,7 +1651,15 @@ public abstract class LuceneTestCase extends Assert {
   }
 
   @Before
-  public void resetDefaultQueryCache() {
+  public void resetTestDefaultQueryCache() {
+    // Make sure each test method has its own cache
+    resetDefaultQueryCache();
+  }
+
+  @BeforeClass
+  public static void resetDefaultQueryCache() {
+    // we need to reset the query cache in an @BeforeClass so that tests that
+    // instantiate an IndexSearcher in an @BeforeClass method use a fresh new cache
     IndexSearcher.setDefaultQueryCache(new LRUQueryCache(10000, 1 << 25));
     IndexSearcher.setDefaultQueryCachingPolicy(MAYBE_CACHE_POLICY);
   }