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/BUCK

@@ -22,7 +22,7 @@ rn_xplat_cxx_library(
         [
             ("", "*.h"),
         ],
-        prefix = "react",
+        prefix = "react/renderer/mapbuffer",
     ),
     compiler_flags = [
         "-fexceptions",
@@ -63,5 +63,6 @@ fb_xplat_cxx_test(
     deps = [
         "//xplat/folly:molly",
         "//xplat/third-party/gmock:gtest",
+        react_native_xplat_target("react/renderer/mapbuffer:mapbuffer"),
     ],
 )

ReactCommon/react/renderer/mapbuffer/MapBuffer.cpp

@@ -14,5 +14,9 @@ MapBuffer::MapBuffer() {}
 
 MapBuffer::~MapBuffer() {}
 
+int MapBuffer::getSize() {
+  return 0;
+}
+
 } // namespace react
 } // namespace facebook

ReactCommon/react/renderer/mapbuffer/MapBuffer.h

@@ -31,6 +31,8 @@ class MapBuffer {
  public:
   MapBuffer();
   virtual ~MapBuffer();
+
+  int getSize();
 };
 
 } // namespace react

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);
 }