Added a test of an empty hashtable

JsonGeneratorTests/JsonHashTableTests.cpp

@@ -0,0 +1,30 @@
+#include "CppUnitTest.h"
+#include "JsonHashTable.h"
+
+using namespace Microsoft::VisualStudio::CppUnitTestFramework;
+
+namespace JsonGeneratorTests
+{
+    TEST_CLASS(JsonHashTableTests)
+    {
+        JsonHashTable<2> hash;
+
+    public:
+        
+        TEST_METHOD(Empty)
+        {
+            assertJsonIs("{}");
+        }
+
+    private:
+
+        void assertJsonIs(const char* expected)
+        {
+            char buffer[256];
+
+            hash.writeTo(buffer, sizeof(buffer));
+
+            Assert::AreEqual(expected, buffer);
+        }
+    };
+}