Setup test infra into mapBuffer project

Summary:
Setup test infra into mapBuffer project

changelog: [internal]

Reviewed By: JoshuaGross

Differential Revision: D25733949

fbshipit-source-id: bcfc89d87e28dc5a6ed28bc6b56893aa6f191e71

ReactCommon/react/renderer/mapbuffer/tests/MapBufferTest.cpp

@@ -7,8 +7,14 @@
 
 #include <memory>
 
+#include <assert.h>
 #include <gtest/gtest.h>
+#include <react/renderer/mapbuffer/MapBuffer.h>
 
-TEST(MapBufferTest, testSomething) {
-  // TODO
+using namespace facebook::react;
+
+// Dummy test to create setup of tests
+TEST(MapBufferTest, testMapCreation) {
+  auto buffer = MapBuffer();
+  assert(buffer.getSize() == 0);
 }