JsonVariant automatically promotes to JsonObject or JsonArray on write

test/JsonDocument/CMakeLists.txt

@@ -3,9 +3,11 @@
 # MIT License
 
 add_executable(JsonDocumentTests
+	add.cpp
+	createNested.cpp
 	DynamicJsonDocument.cpp
-	nesting.cpp
 	isNull.cpp
+	nesting.cpp
 	StaticJsonDocument.cpp
 	subscript.cpp
 )

test/JsonDocument/add.cpp

@@ -0,0 +1,22 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("JsonDocument::add()") {
+  DynamicJsonDocument doc(4096);
+
+  SECTION("integer") {
+    doc.add(42);
+
+    REQUIRE(doc.as<std::string>() == "[42]");
+  }
+
+  SECTION("const char*") {
+    doc.add("hello");
+
+    REQUIRE(doc.as<std::string>() == "[\"hello\"]");
+  }
+}

test/JsonDocument/createNested.cpp

@@ -0,0 +1,66 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("JsonDocument::createNestedArray()") {
+  DynamicJsonDocument doc(4096);
+
+  SECTION("promotes to array") {
+    doc.createNestedArray();
+
+    REQUIRE(doc.is<JsonArray>());
+  }
+}
+
+TEST_CASE("JsonDocument::createNestedArray(key)") {
+  DynamicJsonDocument doc(4096);
+
+  SECTION("key is const char*") {
+    SECTION("promotes to object") {
+      doc.createNestedArray("hello");
+
+      REQUIRE(doc.is<JsonObject>());
+    }
+  }
+
+  SECTION("key is std::string") {
+    SECTION("promotes to object") {
+      doc.createNestedArray(std::string("hello"));
+
+      REQUIRE(doc.is<JsonObject>());
+    }
+  }
+}
+
+TEST_CASE("JsonDocument::createNestedObject()") {
+  DynamicJsonDocument doc(4096);
+
+  SECTION("promotes to array") {
+    doc.createNestedObject();
+
+    REQUIRE(doc.is<JsonArray>());
+  }
+}
+
+TEST_CASE("JsonDocument::createNestedObject(key)") {
+  DynamicJsonDocument doc(4096);
+
+  SECTION("key is const char*") {
+    SECTION("promotes to object") {
+      doc.createNestedObject("hello");
+
+      REQUIRE(doc.is<JsonObject>());
+    }
+  }
+
+  SECTION("key is std::string") {
+    SECTION("promotes to object") {
+      doc.createNestedObject(std::string("hello"));
+
+      REQUIRE(doc.is<JsonObject>());
+    }
+  }
+}

test/JsonDocument/subscript.cpp

@@ -21,6 +21,11 @@ TEST_CASE("JsonDocument::operator[]") {
       REQUIRE(doc[std::string("hello")] == "world");
       REQUIRE(cdoc[std::string("hello")] == "world");
     }
+
+    SECTION("supports operator|") {
+      REQUIRE((doc["hello"] | "nope") == std::string("world"));
+      REQUIRE((doc["world"] | "nope") == std::string("nope"));
+    }
   }
 
   SECTION("array") {
@@ -30,3 +35,11 @@ TEST_CASE("JsonDocument::operator[]") {
     REQUIRE(cdoc[1] == "world");
   }
 }
+
+TEST_CASE("JsonDocument automatically promotes to object") {
+  DynamicJsonDocument doc(4096);
+
+  doc["one"]["two"]["three"] = 4;
+
+  REQUIRE(doc["one"]["two"]["three"] == 4);
+}