Is there any way to force the jest to run the tests marked as xit and xtest?

In exercises done by "exerism", the tests come as "xit" instead of "it". This way the jest does not run these tests.

Is there any way to force all tests to run, without having to change "xit" to "it"?

describe('A leap year', () => {

  it('is not very common', () => {
    expect(isLeapYear(2015)).toBeFalsy()
  })

  xit('is introduced every 4 years to adjust about a day', () => {
    expect(isLeapYear(2016)).toBeTruthy()
  })
})