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jest-circus

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jest-circus

30.0.0-rc.1
next
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npmnpm
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30M
-2.48%
Maintainers
5
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What is jest-circus?

The jest-circus package is a test runner for Jest that aims to be a foundation for building testing frameworks. It provides a feature-rich API for defining tests, handling test execution, and setting up and tearing down test environments. It's designed to be more extensible and maintainable than Jest's default test runner.

What are jest-circus's main functionalities?

Defining Tests

This feature allows you to define individual test cases using the `test` function. The code sample demonstrates a simple test that checks if the addition of 1 and 2 equals 3.

test('adds 1 + 2 to equal 3', () => {
  expect(1 + 2).toBe(3);
});

Setup and Teardown

Jest-circus provides lifecycle methods like `beforeEach` and `afterEach` for setting up and tearing down your test environment before and after each test, respectively.

beforeEach(() => {
  initializeCityDatabase();
});

afterEach(() => {
  clearCityDatabase();
});

Test Suites

Organize tests into test suites using the `describe` block. This allows grouping of related tests, making tests easier to manage and understand.

describe('matching cities to foods', () => {
  test('Vienna <3 sausage', () => {
    expect(matchCityToFood('Vienna')).toBe('sausage');
  });
});

Asynchronous Testing

Support for testing asynchronous code using async/await syntax or promises, allowing for straightforward testing of asynchronous operations.

test('the data is peanut butter', async () => {
  await expect(fetchData()).resolves.toBe('peanut butter');
});

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Package last updated on 09 Jun 2025

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