Convert all tests to single-file packages.

tests/vibe.core.net.1441.d

@@ -0,0 +1,38 @@
+/++ dub.sdl:
+name "test"
+description "TCP disconnect task issue"
+dependency "vibe-core" path="../../"
++/
+module test;
+
+import vibe.core.core;
+import vibe.core.net;
+import core.time : msecs;
+import std.string : representation;
+
+void main()
+{
+	import vibe.core.log;
+	bool done = false;
+	listenTCP(11375, (conn) {
+		try {
+			conn.write("foo".representation);
+			conn.close();
+		} catch (Exception e) {
+			assert(false, e.msg);
+		}
+		done = true;
+	});
+
+	runTask({
+		auto conn = connectTCP("127.0.0.1", 11375);
+		conn.close();
+
+		sleep(50.msecs);
+		assert(done);
+
+		exitEventLoop();
+	});
+
+	runEventLoop();
+}