jest/no-hooks Style

What it does

Disallows Jest setup and teardown hooks, such as beforeAll.

Why is this bad?

Jest provides global functions for setup and teardown tasks, which are called before/after each test case and each test suite. The use of these hooks promotes shared state between tests.

This rule reports for the following function calls:

• beforeAll
• beforeEach
• afterAll
• afterEach

Example

function setupFoo(options) {
  /* ... */
}
function setupBar(options) {
  /* ... */
}

describe("foo", () => {
  let foo;
  beforeEach(() => {
    foo = setupFoo();
  });
  afterEach(() => {
    foo = null;
  });
  it("does something", () => {
    expect(foo.doesSomething()).toBe(true);
  });
  describe("with bar", () => {
    let bar;
    beforeEach(() => {
      bar = setupBar();
    });
    afterEach(() => {
      bar = null;
    });
    it("does something with bar", () => {
      expect(foo.doesSomething(bar)).toBe(true);
    });
  });
});

References

• Rule Source