Add test for Connection.

tests/test_connection.cpp

@@ -0,0 +1,51 @@
+/*  This file is part of mastodonpp.
+ *  Copyright © 2020 tastytea <tastytea@tastytea.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "instance.hpp"
+#include "connection.hpp"
+
+#include <catch.hpp>
+
+#include <exception>
+
+namespace mastodonpp
+{
+
+
+SCENARIO ("mastodonpp::Connection.")
+{
+    bool exception = false;
+
+    WHEN ("Connection is instantiated.")
+    {
+        try
+        {
+            Instance instance{"example.com", {}};
+            Connection connection{instance};
+        }
+        catch (const std::exception &e)
+        {
+            exception = true;
+        }
+
+        THEN ("No exception is thrown")
+        {
+            REQUIRE_FALSE(exception);
+        }
+    }
+}
+
+} // namespace mastodonpp