add missing lib

lib/ArduinoJson/test/JsonObject/containsKey.cpp

@@ -0,0 +1,30 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("JsonObject::containsKey()") {
+  DynamicJsonBuffer _jsonBuffer;
+  JsonObject& _object = _jsonBuffer.createObject();
+
+  SECTION("ContainsKeyReturnsFalseForNonExistingKey") {
+    _object.set("hello", 42);
+
+    REQUIRE(false == _object.containsKey("world"));
+  }
+
+  SECTION("ContainsKeyReturnsTrueForDefinedValue") {
+    _object.set("hello", 42);
+
+    REQUIRE(true == _object.containsKey("hello"));
+  }
+
+  SECTION("ContainsKeyReturnsFalseAfterRemove") {
+    _object.set("hello", 42);
+    _object.remove("hello");
+
+    REQUIRE(false == _object.containsKey("hello"));
+  }
+}