Add some tests

jest.config.js

@@ -6,5 +6,6 @@ module.exports = {
     '^.+\\.tsx?$': 'ts-jest'
   },
   // testRegex: 'spec\\.(ts|tsx)$' // TODO Skip api/ tests for now, as it's still WIP
-  testRegex: 'packages/(abi|light.js|light.js-react)/.*spec\\.(ts|tsx)$'
+  testRegex:
+    'packages/(abi|electron|light.js|light.js-react)/.*spec\\.(ts|tsx)$'
 };

packages/electron/jest.config.js

@@ -0,0 +1,3 @@
+const baseConfig = require('../../jest.config');
+
+module.exports = baseConfig;

packages/electron/src/checkClockSync.spec.ts

@@ -0,0 +1,16 @@
+// Copyright 2015-2018 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+//
+// SPDX-License-Identifier: MIT
+
+import { checkClockSync } from './checkClockSync';
+
+jest.mock('sntp', () => ({ time: () => Promise.resolve({ t: 1234 }) }));
+
+it('should return the correct syncness', async done => {
+  expect(await checkClockSync()).toEqual({
+    isClockSync: true,
+    timeDrift: 1234
+  });
+  done();
+});

packages/electron/src/utils/logCommand.spec.ts

@@ -0,0 +1,10 @@
+// Copyright 2015-2018 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+//
+// SPDX-License-Identifier: MIT
+
+import logCommand from './logCommand';
+
+test('should correctly log a command', () => {
+  expect(logCommand('foo', ['-a', '23'])).toBe('Running "foo -a 23".');
+});

packages/electron/src/utils/logger.spec.ts

@@ -0,0 +1,14 @@
+// Copyright 2015-2018 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+//
+// SPDX-License-Identifier: MIT
+
+import getLogger, { setLogger } from './logger';
+
+test('should correctly set logger', () => {
+  const logger = () => () => {
+    /* Do nothing. */
+  };
+  setLogger(logger);
+  expect(getLogger()).toBe(logger);
+});