add arduino json lib

#182

lib/ArduinoJson/test/JsonObject/prettyPrintTo.cpp

@@ -0,0 +1,76 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+#include <string>
+
+void check(const JsonObject &obj, const std::string expected) {
+  char json[256];
+
+  size_t actualLen = obj.prettyPrintTo(json);
+  size_t measuredLen = obj.measurePrettyLength();
+
+  REQUIRE(json == expected);
+  REQUIRE(expected.size() == actualLen);
+  REQUIRE(expected.size() == measuredLen);
+}
+
+TEST_CASE("JsonObject::prettyPrintTo()") {
+  DynamicJsonBuffer jb;
+  JsonObject &obj = jb.createObject();
+
+  SECTION("EmptyObject") {
+    check(obj, "{}");
+  }
+
+  SECTION("OneMember") {
+    obj["key"] = "value";
+
+    check(obj,
+          "{\r\n"
+          "  \"key\": \"value\"\r\n"
+          "}");
+  }
+
+  SECTION("TwoMembers") {
+    obj["key1"] = "value1";
+    obj["key2"] = "value2";
+
+    check(obj,
+          "{\r\n"
+          "  \"key1\": \"value1\",\r\n"
+          "  \"key2\": \"value2\"\r\n"
+          "}");
+  }
+
+  SECTION("EmptyNestedContainers") {
+    obj.createNestedObject("key1");
+    obj.createNestedArray("key2");
+
+    check(obj,
+          "{\r\n"
+          "  \"key1\": {},\r\n"
+          "  \"key2\": []\r\n"
+          "}");
+  }
+
+  SECTION("NestedContainers") {
+    JsonObject &nested1 = obj.createNestedObject("key1");
+    nested1["a"] = 1;
+
+    JsonArray &nested2 = obj.createNestedArray("key2");
+    nested2.add(2);
+
+    check(obj,
+          "{\r\n"
+          "  \"key1\": {\r\n"
+          "    \"a\": 1\r\n"
+          "  },\r\n"
+          "  \"key2\": [\r\n"
+          "    2\r\n"
+          "  ]\r\n"
+          "}");
+  }
+}