How to use the opn.mock function in opn
To help you get started, we’ve selected a few opn examples, based on popular ways it is used in public projects.
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evilz / vscode-reveal / test / browserHelper.jest.ts View on Github 
test('Should use headless chrome only when needed', async () => {
(fs.statSync as any).mockImplementation((_) => true);
(os.platform as any).mockImplementation(() => 'win32');
(opn as any).mockImplementation(async (url, opts) => { })
await openInBrowser(DEFAULT_CHROME_PATH.WINx86, "http://theurl")
expect(opn.mock.calls.length).toBe(1);
expect(opn.mock.calls[0][0]).toBe("http://theurl")
expect(opn.mock.calls[0][1]).toStrictEqual({ app: DEFAULT_CHROME_PATH.WINx86 })
await openInBrowser(DEFAULT_CHROME_PATH.WINx86, "http://theurl", true)
expect(opn.mock.calls.length).toBe(2);
expect(opn.mock.calls[1][0]).toBe("http://theurl")
expect(opn.mock.calls[1][1]).toStrictEqual({ app: [DEFAULT_CHROME_PATH.WINx86, "--headless"] })
})test('Should use headless chrome only when needed', async () => {
(fs.statSync as any).mockImplementation((_) => true);
(os.platform as any).mockImplementation(() => 'win32');
(opn as any).mockImplementation(async (url, opts) => { })
await openInBrowser(DEFAULT_CHROME_PATH.WINx86, "http://theurl")
expect(opn.mock.calls.length).toBe(1);
expect(opn.mock.calls[0][0]).toBe("http://theurl")
expect(opn.mock.calls[0][1]).toStrictEqual({ app: DEFAULT_CHROME_PATH.WINx86 })
await openInBrowser(DEFAULT_CHROME_PATH.WINx86, "http://theurl", true)
expect(opn.mock.calls.length).toBe(2);
expect(opn.mock.calls[1][0]).toBe("http://theurl")
expect(opn.mock.calls[1][1]).toStrictEqual({ app: [DEFAULT_CHROME_PATH.WINx86, "--headless"] })
})opn
Open stuff like URLs, files, executables. Cross-platform.
