Added JsonDocument::operator[]

test/JsonDocument/CMakeLists.txt

@@ -7,6 +7,7 @@ add_executable(JsonDocumentTests
 	nesting.cpp
 	isNull.cpp
 	StaticJsonDocument.cpp
+	subscript.cpp
 )
 
 target_link_libraries(JsonDocumentTests catch)

test/JsonDocument/subscript.cpp

@@ -0,0 +1,32 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("JsonDocument::operator[]") {
+  DynamicJsonDocument doc(4096);
+  const JsonDocument& cdoc = doc;
+
+  SECTION("object") {
+    deserializeJson(doc, "{\"hello\":\"world\"}");
+
+    SECTION("const char*") {
+      REQUIRE(doc["hello"] == "world");
+      REQUIRE(cdoc["hello"] == "world");
+    }
+
+    SECTION("std::string") {
+      REQUIRE(doc[std::string("hello")] == "world");
+      REQUIRE(cdoc[std::string("hello")] == "world");
+    }
+  }
+
+  SECTION("array") {
+    deserializeJson(doc, "[\"hello\",\"world\"]");
+
+    REQUIRE(doc[1] == "world");
+    REQUIRE(cdoc[1] == "world");
+  }
+}