test('things', (t) => {
  t.plan(1)
  t.equal('actual', 'expected')
  t.equal('actual', 'expected', 'should be equal') // messages are optional
  t.end(err)
  t.fail('msg')
  t.pass('msg')
  t.timeoutAfter(2000)
  t.skip('msg')
  t.ok(value, 'is truthy')
  t.notOk(value, 'is falsy')
  t.error(err, 'is falsy (print err.message)')
  t.equal(actual, expected, 'is equal')
  t.notEqual
  t.deepEqual(actual, expected, 'is equal (use node's deepEqual)')
  t.notDeepEqual
  t.looseEqual(actual, expected, 'is equal (use node's deepEqual with ==)')
  t.notLooseEqual
  t.throws(fn, /FooError/)
  t.throws(fn, FooError /* class */)
  t.doesNotThrow
  t.comment('message')
})

test.only((t) => { ... })