Moved ancillary files to extras/ (fixes #1011)

extras/tests/JsonArray/size.cpp

@@ -0,0 +1,31 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2019
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("JsonArray::size()") {
+  DynamicJsonDocument doc(4096);
+  JsonArray array = doc.to<JsonArray>();
+
+  SECTION("returns 0 is empty") {
+    REQUIRE(0U == array.size());
+  }
+
+  SECTION("increases after add()") {
+    array.add("hello");
+    REQUIRE(1U == array.size());
+
+    array.add("world");
+    REQUIRE(2U == array.size());
+  }
+
+  SECTION("remains the same after replacing an element") {
+    array.add("hello");
+    REQUIRE(1U == array.size());
+
+    array[0] = "hello";
+    REQUIRE(1U == array.size());
+  }
+}