Added DeserializationError::EmptyInput

extras/tests/MsgPackDeserializer/CMakeLists.txt

@@ -10,6 +10,7 @@ add_executable(MsgPackDeserializerTests
 	doubleToFloat.cpp
 	incompleteInput.cpp
 	input_types.cpp
+	misc.cpp
 	nestingLimit.cpp
 	notSupported.cpp
 )

extras/tests/MsgPackDeserializer/misc.cpp

@@ -0,0 +1,24 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2020
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("deserializeMsgPack() returns EmptyInput") {
+  StaticJsonDocument<100> doc;
+
+  SECTION("from sized buffer") {
+    DeserializationError err = deserializeMsgPack(doc, "", 0);
+
+    REQUIRE(err == DeserializationError::EmptyInput);
+  }
+
+  SECTION("from stream") {
+    std::istringstream input("");
+
+    DeserializationError err = deserializeMsgPack(doc, input);
+
+    REQUIRE(err == DeserializationError::EmptyInput);
+  }
+}