add arduino json lib

#182

lib/ArduinoJson/test/StaticJsonBuffer/createObject.cpp

@@ -0,0 +1,56 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("StaticJsonBuffer::createObject()") {
+  SECTION("GrowsWithObject") {
+    StaticJsonBuffer<JSON_OBJECT_SIZE(3)> buffer;
+
+    JsonObject &obj = buffer.createObject();
+    REQUIRE(JSON_OBJECT_SIZE(0) == buffer.size());
+
+    obj["hello"];
+    REQUIRE(JSON_OBJECT_SIZE(0) == buffer.size());
+
+    obj["hello"] = 1;
+    REQUIRE(JSON_OBJECT_SIZE(1) == buffer.size());
+
+    obj["world"] = 2;
+    REQUIRE(JSON_OBJECT_SIZE(2) == buffer.size());
+
+    obj["world"] = 3;  // <- same key, should not grow
+    REQUIRE(JSON_OBJECT_SIZE(2) == buffer.size());
+  }
+
+  SECTION("SucceedWhenBigEnough") {
+    StaticJsonBuffer<JSON_OBJECT_SIZE(0)> buffer;
+
+    JsonObject &object = buffer.createObject();
+    REQUIRE(object.success());
+  }
+
+  SECTION("FailsWhenTooSmall") {
+    StaticJsonBuffer<JSON_OBJECT_SIZE(0) - 1> buffer;
+
+    JsonObject &object = buffer.createObject();
+    REQUIRE_FALSE(object.success());
+  }
+
+  SECTION("ObjectDoesntGrowWhenFull") {
+    StaticJsonBuffer<JSON_OBJECT_SIZE(1)> buffer;
+
+    JsonObject &obj = buffer.createObject();
+    obj["hello"] = 1;
+    obj["world"] = 2;
+
+    REQUIRE(JSON_OBJECT_SIZE(1) == buffer.size());
+    REQUIRE(1 == obj.size());
+
+    char json[64];
+    obj.printTo(json, sizeof(json));
+    REQUIRE(std::string("{\"hello\":1}") == json);
+  }
+}