first commit

libraries/ArduinoJson/extras/tests/JsonDocument/swap.cpp

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+#include <ArduinoJson.h>
+
+#include <catch.hpp>
+#include <string>
+#include <utility>
+
+using namespace std;
+
+TEST_CASE("std::swap") {
+  SECTION("JsonDocument*") {
+    JsonDocument *p1, *p2;
+    swap(p1, p2);  // issue #1678
+  }
+
+  SECTION("JsonDocument") {
+    JsonDocument doc1, doc2;
+    doc1.set("hello");
+    doc2.set("world");
+
+    swap(doc1, doc2);
+
+    CHECK(doc1.as<string>() == "world");
+    CHECK(doc2.as<string>() == "hello");
+  }
+}