test(client): added clientMode option test (#2078)

Author: knagaitsev

test/ports-map.js

@@ -39,6 +39,7 @@ const portsList = {
   WebsocketClient: 1,
   WebsocketServer: 1,
   ClientMode: 1,
+  'clientMode-option': 1,
 };
 
 let startPort = 8079;

test/server/clientMode-option.test.js

@@ -0,0 +1,102 @@
+'use strict';
+
+const config = require('../fixtures/simple-config/webpack.config');
+const port = require('../ports-map')['clientMode-option'];
+
+describe('clientMode option', () => {
+  let mockedTestServer;
+  let testServer;
+  let getSocketClientPath;
+
+  const clientModes = [
+    {
+      title: 'as a string ("sockjs")',
+      clientMode: 'sockjs',
+      shouldThrow: false,
+    },
+    {
+      title: 'as a path ("sockjs")',
+      clientMode: require.resolve('../../client-src/clients/SockJSClient'),
+      shouldThrow: false,
+    },
+    {
+      title: 'as a nonexistent path',
+      clientMode: '/bad/path/to/implementation',
+      shouldThrow: true,
+    },
+  ];
+
+  describe('is passed to getSocketClientPath correctly', () => {
+    beforeEach(() => {
+      jest.mock('../../lib/utils/getSocketClientPath');
+      // eslint-disable-next-line global-require
+      getSocketClientPath = require('../../lib/utils/getSocketClientPath');
+    });
+
+    afterEach((done) => {
+      jest.resetAllMocks();
+      jest.resetModules();
+
+      mockedTestServer.close(done);
+    });
+
+    clientModes.forEach((data) => {
+      it(data.title, (done) => {
+        // eslint-disable-next-line global-require
+        mockedTestServer = require('../helpers/test-server');
+        mockedTestServer.start(
+          config,
+          {
+            inline: true,
+            clientMode: data.clientMode,
+            port,
+          },
+          () => {
+            expect(getSocketClientPath.mock.calls.length).toEqual(1);
+            expect(getSocketClientPath.mock.calls[0].length).toEqual(1);
+            expect(getSocketClientPath.mock.calls[0][0].clientMode).toEqual(
+              data.clientMode
+            );
+            done();
+          }
+        );
+      });
+    });
+  });
+
+  describe('passed to server', () => {
+    beforeAll(() => {
+      jest.unmock('../../lib/utils/getSocketClientPath');
+      // eslint-disable-next-line global-require
+      testServer = require('../helpers/test-server');
+    });
+
+    afterEach((done) => {
+      testServer.close(done);
+    });
+
+    clientModes.forEach((data) => {
+      it(`${data.title} ${
+        data.shouldThrow ? 'should throw' : 'should not throw'
+      }`, (done) => {
+        const res = () => {
+          testServer.start(
+            config,
+            {
+              inline: true,
+              clientMode: data.clientMode,
+              port,
+            },
+            done
+          );
+        };
+        if (data.shouldThrow) {
+          expect(res).toThrow(/clientMode must be a string/);
+          done();
+        } else {
+          expect(res).not.toThrow();
+        }
+      });
+    });
+  });
+});