Added test of an empty string

JsonGeneratorTests/IntentedPrintTests.cpp

@@ -0,0 +1,42 @@
+/*
+* Arduino JSON library
+* Benoit Blanchon 2014 - MIT License
+*/
+
+#include "CppUnitTest.h"
+#include "IndentedPrintDecorator.h"
+#include "StringBuilder.h"
+
+using namespace ArduinoJson::Internals;
+using namespace Microsoft::VisualStudio::CppUnitTestFramework;
+
+namespace JsonGeneratorTests
+{
+	TEST_CLASS(IntentedPrintTests)
+	{
+        char buffer[256];
+
+	public:
+		
+		TEST_METHOD(EmptyString)
+		{
+            whenInputIs("");
+            outputMustBe("");
+		}
+
+    private:
+
+        void whenInputIs(const char input[])
+        {
+            StringBuilder sb(buffer, sizeof(buffer));
+            IndentedPrintDecorator decorator(sb);
+
+            decorator.print(input);
+        }
+
+        void outputMustBe(const char* expected)
+        {
+            Assert::AreEqual(expected, buffer);
+        }
+	};
+}