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    jest-util


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Package description

What is jest-util?

The jest-util package provides utility functions for Jest, a popular JavaScript testing framework. It includes a variety of helpers and tools that are used internally by Jest but can also be useful for developers working with or extending Jest tests.

What are jest-util's main functionalities?

Console Replacement

This feature allows for the creation of a custom console that buffers all logs. This is useful for controlling and testing console output during test runs.

const { BufferedConsole } = require('jest-util');
const customConsole = new BufferedConsole();
customConsole.log('Hello, this is a buffered log.');

Error Formatting

This function formats execution errors for display in Jest's output, providing a standardized view of test errors, including stack traces.

const { formatExecError } = require('jest-util');
const error = new Error('Test error');
const config = {rootDir: '/path/to/project', testMatch: []};
console.log(formatExecError(error, config, {noStackTrace: false}, undefined, true));

Test Path Normalization

This utility normalizes file paths for glob matching, which is particularly useful on Windows where path separators differ.

const { replacePathSepForGlob } = require('jest-util');
const path = 'path\to\test\file.js';
console.log(replacePathSepForGlob(path));

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Changelog

Source

24.9.0

Features

  • [expect] Highlight substring differences when matcher fails, part 1 (#8448)
  • [expect] Highlight substring differences when matcher fails, part 2 (#8528)
  • [expect] Improve report when mock-spy matcher fails, part 1 (#8640)
  • [expect] Improve report when mock-spy matcher fails, part 2 (#8649)
  • [expect] Improve report when mock-spy matcher fails, part 3 (#8697)
  • [expect] Improve report when mock-spy matcher fails, part 4 (#8710)
  • [expect] Throw matcher error when received cannot be jasmine spy (#8747)
  • [expect] Improve report when negative CalledWith assertion fails (#8755)
  • [expect] Improve report when positive CalledWith assertion fails (#8771)
  • [expect] Display equal values for ReturnedWith similar to CalledWith (#8791)
  • [expect, jest-snapshot] Change color from green for some args in matcher hints (#8812)
  • [jest-snapshot] Highlight substring differences when matcher fails, part 3 (#8569)
  • [jest-core] Improve report when snapshots are obsolete (#8665)
  • [jest-cli] Improve chai support (with detailed output, to match jest exceptions) (#8454)
  • [*] Manage the global timeout with --testTimeout command line argument. (#8456)
  • [pretty-format] Render custom displayName of memoized components (#8546)
  • [jest-validate] Allow maxWorkers as part of the jest.config.js (#8565)
  • [jest-runtime] Allow passing configuration objects to transformers (#7288)
  • [@jest/core, @jest/test-sequencer] Support async sort in custom testSequencer (#8642)
  • [jest-runtime, @jest/fake-timers] Add jest.advanceTimersToNextTimer (#8713)
  • [@jest-transform] Extract transforming require logic within jest-core into @jest-transform (#8756)
  • [jest-matcher-utils] Add color options to matcherHint (#8795)
  • [jest-circus/jest-jasmine2] Give clearer output for Node assert errors (#8792)
  • [jest-runner] Export all types in the type signature of jest-runner (#8825)

Fixes

  • [jest-cli] Detect side-effect only imports when running --onlyChanged or --changedSince (#8670)
  • [jest-cli] Allow --maxWorkers to work with % input again (#8565)
  • [babel-plugin-jest-hoist] Expand list of whitelisted globals in global mocks (#8429)
  • [jest-core] Make watch plugin initialization errors look nice (#8422)
  • [jest-snapshot] Prevent inline snapshots from drifting when inline snapshots are updated (#8492)
  • [jest-haste-map] Don't throw on missing mapper in Node crawler (#8558)
  • [jest-core] Fix incorrect passWithNoTests warning (#8595)
  • [jest-snapshots] Fix test retries that contain snapshots (#8629)
  • [jest-mock] Fix incorrect assignments when restoring mocks in instances where they originally didn't exist (#8631)
  • [expect] Fix stack overflow when matching objects with circular references (#8687)
  • [jest-haste-map] Workaround a node >=12.5.0 bug that causes the process not to exit after tests have completed and cancerous memory growth (#8787)

Chore & Maintenance

  • [docs] Replace FlowType with TypeScript in CONTRIBUTING.MD code conventions
  • [jest-leak-detector] remove code repeat (#8438)
  • [docs] Add example to jest.requireActual (#8482)
  • [docs] Add example to jest.mock for mocking ES6 modules with the factory parameter (#8550)
  • [docs] Add information about using jest.doMock with ES6 imports (#8573)
  • [docs] Fix variable name in custom-matcher-api code example (#8582)
  • [docs] Fix example used in custom environment docs (#8617)
  • [docs] Updated react tutorial to refer to new package of react-testing-library (@testing-library/react) (#8753)
  • [docs] Updated imports of react-testing-library to @testing-library/react in website (#8757)
  • [jest-core] Add getVersion (moved from jest-cli) (#8706)
  • [docs] Fix MockFunctions example that was using toContain instead of toContainEqual (#8765)
  • [*] Make sure copyright header comment includes license (#8783)
  • [*] Check copyright and license as one joined substring (#8815)
  • [docs] Fix WatchPlugins jestHooks.shouldRunTestSuite example that receives an object (#8784)
  • [*] Enforce LF line endings (#8809)
  • [pretty-format] Delete obsolete link and simplify structure in README (#8824)
  • [docs] Fix broken transform link on webpack page (#9155)

Performance

  • [jest-watcher] Minor optimization for JestHook (#8746)
  • [@jest/reporters] Prevent runaway CPU usage with --notify on macOS (#8831)

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Last updated on 16 Aug 2019

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