snack bar unit test (#594)

spec/__snapshots__/snackBar.spec.ts.snap

@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`snack bar should render correctly 1`] = `<div />`;

spec/snackBar.spec.ts

@@ -0,0 +1,56 @@
+import { shallow } from 'enzyme';
+import * as React from 'react';
+import SnackBar from '../src/renderer/components/snack-bar';
+import { ipcRenderer } from './__mocks__/electron';
+
+describe('snack bar', () => {
+    beforeEach(() => {
+        jest.useFakeTimers();
+        jest.restoreAllMocks();
+    });
+    // events label
+    const onEventLabel = 'on';
+    const removeListenerEventLabel = 'removeListener';
+    const windowEnterFullScreenEventLabel = 'window-enter-full-screen';
+    const windowLeaveFullScreenEventLabel = 'window-leave-full-screen';
+
+    it('should render correctly', () => {
+        const wrapper = shallow(React.createElement(SnackBar));
+        expect(wrapper).toMatchSnapshot();
+    });
+
+    it('should call mount correctly', () => {
+        const spy = jest.spyOn(ipcRenderer, onEventLabel);
+        shallow(React.createElement(SnackBar));
+        expect(spy).nthCalledWith(1, windowEnterFullScreenEventLabel, expect.any(Function));
+        expect(spy).nthCalledWith(2, windowLeaveFullScreenEventLabel, expect.any(Function));
+    });
+
+    it('should call unmount correctly', () => {
+        const spy = jest.spyOn(ipcRenderer, removeListenerEventLabel);
+        shallow(React.createElement(SnackBar)).unmount();
+        expect(spy).nthCalledWith(1, windowEnterFullScreenEventLabel, expect.any(Function));
+        expect(spy).nthCalledWith(2, windowLeaveFullScreenEventLabel, expect.any(Function));
+    });
+
+    it('should call `removeSnackBar` correctly', () => {
+        const spy = jest.spyOn(SnackBar.prototype, 'setState');
+        const expectedValue = { show: false };
+        shallow(React.createElement(SnackBar));
+        ipcRenderer.send(windowLeaveFullScreenEventLabel, null);
+        expect(spy).lastCalledWith(expectedValue);
+        jest.runOnlyPendingTimers();
+    });
+
+    it('should call `showSnackBar` correctly', () => {
+        const spy = jest.spyOn(SnackBar.prototype, 'setState');
+        const expectedValueFirst = { show: true };
+        const expectedValueSecond = { show: false };
+        shallow(React.createElement(SnackBar));
+        ipcRenderer.send(windowEnterFullScreenEventLabel, null);
+        expect(setTimeout).lastCalledWith(expect.any(Function), 3000);
+        expect(spy).nthCalledWith(1, expectedValueFirst);
+        jest.runOnlyPendingTimers();
+        expect(spy).nthCalledWith(2, expectedValueSecond);
+    });
+});