test(server/client): make sockjs implementation tests use snapshots (#2070)

Author: knagaitsev

test/client/clients/SockJSClient.test.js

@@ -48,10 +48,7 @@ describe('SockJSClient', () => {
       });
 
       setTimeout(() => {
-        expect(data.length).toEqual(3);
-        expect(data[0]).toEqual('open');
-        expect(data[1]).toEqual('hello world');
-        expect(data[2]).toEqual('close');
+        expect(data).toMatchSnapshot();
         done();
       }, 3000);
     });

test/client/clients/__snapshots__/SockJSClient.test.js.snap

@@ -0,0 +1,9 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`SockJSClient client should open, receive message, and close 1`] = `
+Array [
+  "open",
+  "hello world",
+  "close",
+]
+`;

test/server/servers/SockJSServer.test.js

@@ -54,10 +54,7 @@ describe('SockJSServer', () => {
       };
 
       setTimeout(() => {
-        expect(data.length).toEqual(3);
-        expect(data[0]).toEqual('open');
-        expect(data[1]).toEqual('hello world');
-        expect(data[2]).toEqual('close');
+        expect(data).toMatchSnapshot();
         done();
       }, 3000);
     });

test/server/servers/__snapshots__/SockJSServer.test.js.snap

@@ -0,0 +1,9 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`SockJSServer server should recieve connection, send message, and close client 1`] = `
+Array [
+  "open",
+  "hello world",
+  "close",
+]
+`;