Jest environment for running Selenium WebDriver tests
I like using yarn for installations.
yarn add -D jest-environment-selenium
But npm works too!
npm install --save-dev jest-environment-selenium
Add this to the package.json:
"jest": {
"testEnvironment": "jest-environment-selenium",
"setupTestFrameworkScriptFile": "jest-environment-selenium/dist/setup.js"
}By default tests will run against a local chromedriver, but you can easily specify something else.
"jest": {
"testEnvironmentOptions": {
"capabilities": {
"browserName": "firefox"
},
"server": "http://localhost:4444/wd/hub",
"proxyType": "manual",
"proxyOptions": {
"https": "http://127.0.0.1:3218"
}
}
}Tests will be initialized with a driver according to the options (or a default chrome one)
test('load wikipedia', () => {
driver.get('https://en.wikipedia.org/wiki/Base64');
});Kills the used session and starts a new one.
afterEach(async () => (cleanup()));Failing to call cleanup will result in non "idempotent" tests, which reuse the same WebDriver session (which can lead to difficult to debug errors in your tests).
Since the tests are async make sure you return a Promise so that jest won't bail early
test('load wikipedia', () => {
driver.get('https://en.wikipedia.org/wiki/Base64');
return driver.getTitle().then(title => {expect(title).toBeDefined();});
});Custom WebDriver matchers designed for ease of use with jest
toBePresent checks that an element appears on a page, it expects to receive a WebElementPromise
test('link appears in the page', () => {
driver.get('https://en.wikipedia.org/wiki/Base64');
return expect(driver.findElements(By.linkText("binary-to-text encoding"))).resolves.toBePresent();
});toBeChecked checks that a checkbox is checked (many checks wow! 😱), it expects to receive a WebElementPromise
test('a checkbox is checked', () => {
driver.get('somewhere');
return expect(driver.findElements(By.css('input[type="checkbox"]'))).resolves.toBeChecked();
});toBeEditable checks that an input is editable (enabled and not readonly), it expects to receive a WebElementPromise
test('an input is editable', () => {
driver.get('somewhere');
return expect(driver.findElements(By.css('input'))).resolves.toBeEditable();
});toHaveValue checks that an input value is what you expect, it expects to receive a WebElementPromise
test('an input has the value', () => {
driver.get('somewhere');
return expect(driver.findElements(By.css('input'))).resolves.toHaveValue('test');
});toHaveValue checks that a select value is what you expect (will fail on other inputs), it expects to receive a WebElementPromise
test('a select has the right value', () => {
driver.get('somewhere');
return expect(driver.findElements(By.css('select'))).resolves.toHaveSelectedValue('test');
});toHaveValue checks that an element innetText is what you expect, it expects to receive a WebElementPromise
test('the paragraph has the correct text', () => {
driver.get('somewhere');
return expect(driver.findElements(By.css('p'))).resolves.toHaveText('some nice text, maybe lorem ipsum');
});
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