Remove not relevant test

tests/graphql/client.spec.ts

@@ -1,5 +1,4 @@
 import * as sinon from "sinon";
-import * as ws from "ws";
 
 import { GraphQLError, UserUnauthorizedError } from "../../lib/errors";
 
@@ -552,27 +551,6 @@ describe("createSubscriptionClient", () => {
       });
       expect(subscriptionClient).to.equal(fakeGraphqlWsClient);
     });
-
-    describe("when executing in a browser environment", () => {
-      before(() => {
-        (global as any).window = {
-          WebSocket: {...ws, fake: true},
-        };
-      });
-
-      after(() => {
-        (global as any).window = undefined;
-      });
-
-      it("should use the native browser WebSocket implementation", () => {
-        createClientStub.resetHistory();
-
-        client.graphQL.createSubscriptionClient();
-
-        expect(createClientStub.callCount).to.equal(1);
-        expect(createClientStub.getCall(0).args[0].webSocketImpl.fake).to.equal(true);
-      });
-    });
   });
 });