forked from jestjs/jest
/
utils.test.ts
286 lines (255 loc) · 8.17 KB
/
utils.test.ts
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
jest.mock('fs');
import fs from 'fs';
import path from 'path';
import assert from 'assert';
import chalk from 'chalk';
import {
deepMerge,
getSnapshotData,
keyToTestName,
saveSnapshotFile,
serialize,
testNameToKey,
SNAPSHOT_GUIDE_LINK,
SNAPSHOT_VERSION,
SNAPSHOT_VERSION_WARNING,
} from '../utils';
const writeFileSync = fs.writeFileSync;
const readFileSync = fs.readFileSync;
const existsSync = fs.existsSync;
beforeEach(() => {
fs.writeFileSync = jest.fn();
fs.readFileSync = jest.fn();
fs.existsSync = jest.fn(() => true);
});
afterEach(() => {
fs.writeFileSync = writeFileSync;
fs.readFileSync = readFileSync;
fs.existsSync = existsSync;
});
test('keyToTestName()', () => {
expect(keyToTestName('abc cde 12')).toBe('abc cde');
expect(keyToTestName('abc cde 12')).toBe('abc cde ');
expect(() => keyToTestName('abc cde')).toThrowError(
'Snapshot keys must end with a number.',
);
});
test('testNameToKey', () => {
expect(testNameToKey('abc cde', 1)).toBe('abc cde 1');
expect(testNameToKey('abc cde ', 12)).toBe('abc cde 12');
});
test('saveSnapshotFile() works with \r\n', () => {
const filename = path.join(__dirname, 'remove-newlines.snap');
const data = {
myKey: '<div>\r\n</div>',
};
saveSnapshotFile(data, filename);
expect(fs.writeFileSync).toBeCalledWith(
filename,
`// Jest Snapshot v1, ${SNAPSHOT_GUIDE_LINK}\n\n` +
'exports[`myKey`] = `<div>\n</div>`;\n',
);
});
test('saveSnapshotFile() works with \r', () => {
const filename = path.join(__dirname, 'remove-newlines.snap');
const data = {
myKey: '<div>\r</div>',
};
saveSnapshotFile(data, filename);
expect(fs.writeFileSync).toBeCalledWith(
filename,
`// Jest Snapshot v1, ${SNAPSHOT_GUIDE_LINK}\n\n` +
'exports[`myKey`] = `<div>\n</div>`;\n',
);
});
test('getSnapshotData() throws when no snapshot version', () => {
const filename = path.join(__dirname, 'old-snapshot.snap');
(fs.readFileSync as jest.Mock).mockImplementation(
() => 'exports[`myKey`] = `<div>\n</div>`;\n',
);
const update = 'none';
expect(() => getSnapshotData(filename, update)).toThrowError(
chalk.red(
`${chalk.bold('Outdated snapshot')}: No snapshot header found. ` +
`Jest 19 introduced versioned snapshots to ensure all developers on ` +
`a project are using the same version of Jest. ` +
`Please update all snapshots during this upgrade of Jest.\n\n`,
) + SNAPSHOT_VERSION_WARNING,
);
});
test('getSnapshotData() throws for older snapshot version', () => {
const filename = path.join(__dirname, 'old-snapshot.snap');
(fs.readFileSync as jest.Mock).mockImplementation(
() =>
`// Jest Snapshot v0.99, ${SNAPSHOT_GUIDE_LINK}\n\n` +
'exports[`myKey`] = `<div>\n</div>`;\n',
);
const update = 'none';
expect(() => getSnapshotData(filename, update)).toThrowError(
chalk.red(
`${chalk.red.bold('Outdated snapshot')}: The version of the snapshot ` +
`file associated with this test is outdated. The snapshot file ` +
`version ensures that all developers on a project are using ` +
`the same version of Jest. ` +
`Please update all snapshots during this upgrade of Jest.\n\n`,
) +
`Expected: v${SNAPSHOT_VERSION}\n` +
`Received: v0.99\n\n` +
SNAPSHOT_VERSION_WARNING,
);
});
test('getSnapshotData() throws for newer snapshot version', () => {
const filename = path.join(__dirname, 'old-snapshot.snap');
(fs.readFileSync as jest.Mock).mockImplementation(
() =>
`// Jest Snapshot v2, ${SNAPSHOT_GUIDE_LINK}\n\n` +
'exports[`myKey`] = `<div>\n</div>`;\n',
);
const update = 'none';
expect(() => getSnapshotData(filename, update)).toThrowError(
chalk.red(
`${chalk.red.bold('Outdated Jest version')}: The version of this ` +
`snapshot file indicates that this project is meant to be used ` +
`with a newer version of Jest. ` +
`The snapshot file version ensures that all developers on a project ` +
`are using the same version of Jest. ` +
`Please update your version of Jest and re-run the tests.\n\n`,
) +
`Expected: v${SNAPSHOT_VERSION}\n` +
`Received: v2`,
);
});
test('getSnapshotData() does not throw for when updating', () => {
const filename = path.join(__dirname, 'old-snapshot.snap');
(fs.readFileSync as jest.Mock).mockImplementation(
() => 'exports[`myKey`] = `<div>\n</div>`;\n',
);
const update = 'all';
expect(() => getSnapshotData(filename, update)).not.toThrow();
});
test('getSnapshotData() marks invalid snapshot dirty when updating', () => {
const filename = path.join(__dirname, 'old-snapshot.snap');
(fs.readFileSync as jest.Mock).mockImplementation(
() => 'exports[`myKey`] = `<div>\n</div>`;\n',
);
const update = 'all';
expect(getSnapshotData(filename, update)).toMatchObject({dirty: true});
});
test('getSnapshotData() marks valid snapshot not dirty when updating', () => {
const filename = path.join(__dirname, 'old-snapshot.snap');
(fs.readFileSync as jest.Mock).mockImplementation(
() =>
`// Jest Snapshot v${SNAPSHOT_VERSION}, ${SNAPSHOT_GUIDE_LINK}\n\n` +
'exports[`myKey`] = `<div>\n</div>`;\n',
);
const update = 'all';
expect(getSnapshotData(filename, update)).toMatchObject({dirty: false});
});
test('escaping', () => {
const filename = path.join(__dirname, 'escaping.snap');
const data = '"\'\\';
saveSnapshotFile({key: data}, filename);
const writtenData = (fs.writeFileSync as jest.Mock).mock.calls[0][1];
expect(writtenData).toBe(
`// Jest Snapshot v1, ${SNAPSHOT_GUIDE_LINK}\n\n` +
'exports[`key`] = `"\'\\\\`;\n',
);
// @ts-ignore
const exports = {}; // eslint-disable-line
// eslint-disable-next-line no-eval
const readData = eval('var exports = {}; ' + writtenData + ' exports');
expect(readData).toEqual({key: data});
const snapshotData = readData.key;
expect(data).toEqual(snapshotData);
});
test('serialize handles \\r\\n', () => {
const data = '<div>\r\n</div>';
const serializedData = serialize(data);
expect(serializedData).toBe('\n"<div>\n</div>"\n');
});
describe('DeepMerge', () => {
it('Correctly merges objects with property matchers', () => {
/* eslint-disable sort-keys */
// to keep keys in numerical order rather than alphabetical
const target = {
data: {
one: 'one',
two: 'two',
three: [
{
four: 'four',
five: 'five',
},
// Include an array element not present in the propertyMatchers
{
six: 'six',
seven: 'seven',
},
],
eight: [{nine: 'nine'}],
},
};
const matcher = expect.any(String);
const propertyMatchers = {
data: {
two: matcher,
three: [
{
four: matcher,
},
],
eight: [
{nine: matcher},
// Include an array element not present in the target
{ten: matcher},
],
},
};
const mergedOutput = deepMerge(target, propertyMatchers);
// Use assert.deepStrictEqual() instead of expect().toStrictEqual()
// since we want to actually validate that we got the matcher
// rather than treat it specially the way that expect() does
assert.deepStrictEqual(mergedOutput, {
data: {
one: 'one',
two: matcher,
three: [
{
four: matcher,
five: 'five',
},
{
six: 'six',
seven: 'seven',
},
],
eight: [{nine: matcher}, {ten: matcher}],
},
});
// Ensure original target is not modified
expect(target).toStrictEqual({
data: {
one: 'one',
two: 'two',
three: [
{
four: 'four',
five: 'five',
},
{
six: 'six',
seven: 'seven',
},
],
eight: [{nine: 'nine'}],
},
});
/* eslint-enable sort-keys */
});
});