Test casting a JsonValue to a JsonArray

JsonGenerator/JsonValue.h

@@ -89,6 +89,11 @@ namespace ArduinoJson
                 return content.asLong;
             }
 
+            operator Printable&()
+            {
+                return *content.asPrintable;
+            }
+
             size_t printTo(Print& p) const
             {
                 // handmade polymorphism

JsonGeneratorTests/JsonValue_Cast_Tests.cpp

@@ -6,6 +6,7 @@
 #include "CppUnitTest.h"
 #include "StringBuilder.h"
 #include "JsonValue.h"
+#include "JsonArray.h"
 
 using namespace Microsoft::VisualStudio::CppUnitTestFramework;
 using namespace ArduinoJson::Generator;
@@ -45,6 +46,12 @@ namespace JsonGeneratorTests
             setValueAndCheckCast(42L);
         }
 
+        TEST_METHOD(Array)
+        {
+            JsonArray<2> array;
+            setValueAndCheckCast(array);
+        }
+
         TEST_METHOD(String)
         {
             setValueAndCheckCast("hello");
@@ -59,5 +66,13 @@ namespace JsonGeneratorTests
             T actual = value;
             Assert::AreEqual(expected, actual);
         }
+
+        template<int N>
+        void setValueAndCheckCast(JsonArray<N>& expected)
+        {
+            value = expected;
+            Printable& actual = value;
+            Assert::AreEqual((void*) &expected, (void*) &actual);
+        }
     };
 }