add http test

test/http_test.ts

@@ -0,0 +1,23 @@
+import './util';
+import assert from "assert";
+import { Client, Room } from "../src";
+
+describe("HTTP", function() {
+    let client: Client;
+
+    before(() => {
+        client = new Client("ws://localhost:4545");
+    });
+
+    describe("errors", () => {
+        it("should return 'offline' error when requesting offline service", async () => {
+            try {
+                await client.http.post("/anything");
+            } catch (e) {
+                console.log({code: e.code, message: e.message});
+                console.log(e);
+            }
+        });
+    });
+
+});