prefer-called-once.md

vitest/prefer-called-once

📝 Enforce using toBeCalledOnce() or toHaveBeenCalledOnce().

🚫 This rule is disabled in the 🌐 all config.

🔧 This rule is automatically fixable by the --fix CLI option.

Rule Details

This rule aims to enforce the use of toBeCalledOnce() or toHaveBeenCalledOnce() over toBeCalledTimes(1) or toHaveBeenCalledTimes(1).

Examples of incorrect code for this rule:

test('foo', () => {
  const mock = vi.fn()
  mock('foo')
  expect(mock).toBeCalledTimes(1)
  expect(mock).toHaveBeenCalledTimes(1)
})

Examples of correct code for this rule:

test('foo', () => {
  const mock = vi.fn()
  mock('foo')
  expect(mock).toBeCalledOnce()
  expect(mock).toHaveBeenCalledOnce()
})