JsonVariant automatically promotes to JsonObject or JsonArray on write

test/JsonVariant/createNested.cpp

@@ -0,0 +1,88 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <stdint.h>
+#include <catch.hpp>
+
+static const char* null = 0;
+
+TEST_CASE("JsonVariant::createNestedObject()") {
+  DynamicJsonDocument doc(4096);
+  JsonVariant variant = doc.to<JsonVariant>();
+
+  SECTION("promotes to array") {
+    JsonObject obj = variant.createNestedObject();
+    obj["value"] = "42";
+
+    REQUIRE(variant.is<JsonArray>() == true);
+    REQUIRE(variant[0]["value"] == 42);
+    REQUIRE(obj.isNull() == false);
+  }
+
+  SECTION("works on MemberProxy") {
+    JsonObject obj = variant["items"].createNestedObject();
+    obj["value"] = "42";
+
+    REQUIRE(variant["items"][0]["value"] == 42);
+  }
+}
+
+TEST_CASE("JsonVariant::createNestedArray()") {
+  DynamicJsonDocument doc(4096);
+  JsonVariant variant = doc.to<JsonVariant>();
+
+  SECTION("promotes to array") {
+    JsonArray arr = variant.createNestedArray();
+
+    REQUIRE(variant.is<JsonArray>() == true);
+    REQUIRE(arr.isNull() == false);
+  }
+
+  SECTION("works on MemberProxy") {
+    JsonArray arr = variant["items"].createNestedArray();
+    arr.add("42");
+
+    REQUIRE(variant["items"][0][0] == 42);
+  }
+}
+
+TEST_CASE("JsonVariant::createNestedObject(key)") {
+  DynamicJsonDocument doc(4096);
+  JsonVariant variant = doc.to<JsonVariant>();
+
+  SECTION("promotes to object") {
+    JsonObject obj = variant.createNestedObject("weather");
+    obj["temp"] = "42";
+
+    REQUIRE(variant.is<JsonObject>() == true);
+    REQUIRE(variant["weather"]["temp"] == 42);
+  }
+
+  SECTION("works on MemberProxy") {
+    JsonObject obj = variant["status"].createNestedObject("weather");
+    obj["temp"] = "42";
+
+    REQUIRE(variant["status"]["weather"]["temp"] == 42);
+  }
+}
+
+TEST_CASE("JsonVariant::createNestedArray(key)") {
+  DynamicJsonDocument doc(4096);
+  JsonVariant variant = doc.to<JsonVariant>();
+
+  SECTION("promotes to object") {
+    JsonArray arr = variant.createNestedArray("items");
+
+    REQUIRE(variant.is<JsonObject>() == true);
+    REQUIRE(arr.isNull() == false);
+  }
+
+  SECTION("works on MemberProxy") {
+    JsonArray arr = variant["weather"].createNestedArray("temp");
+    arr.add("42");
+
+    REQUIRE(variant["weather"]["temp"][0] == 42);
+  }
+}