Reset the counters to make repeated tests pass (#1556)

Summary: Pull Request resolved: https://github.com/facebook/folly/pull/1556

Reviewed By: Orvid

Differential Revision: D27672765

Pulled By: yfeldblum

fbshipit-source-id: edcf9b300c737799399096a8dbc401b3ab49b88c

folly/concurrency/test/ConcurrentHashMapTest.cpp

@@ -166,6 +166,9 @@ TYPED_TEST_P(ConcurrentHashMapTest, EmplaceTest) {
   foomap.emplace(1, foo());
   EXPECT_EQ(foo::moved, 1);
   EXPECT_EQ(foo::copied, 0);
+  // Reset the counters. Repeated tests are allowed
+  foo::moved = 0;
+  foo::copied = 0;
 }
 
 TYPED_TEST_P(ConcurrentHashMapTest, MapInsertIteratorValueTest) {