old_contents: import {describe} from 'ava-spec';
  
  import sinon from 'sinon';
  
  import {delay, finallyRejectsWithInitial} from '../lib/helpers';
  
  const mark = () =>
    ((start) => () => process.hrtime.bigint() - start)(process.hrtime.bigint());
  
  describe('finallyRejectsWithInitial', (it) => {
    it('invokes the function', async (t) => {
      const spy = sinon.spy();
      await finallyRejectsWithInitial(Promise.resolve(), spy);
      t.true(spy.calledOnce);
      spy.resetHistory();
  
      await t.throws(
        finallyRejectsWithInitial(Promise.reject(new Error('test 1')), spy),
        'test 1'
      );
      t.true(spy.calledOnce);
      spy.resetHistory();
  
      await finallyRejectsWithInitial(delay(10), spy);
      t.true(spy.calledOnce);
    });
  
    it('prefers the original error', async (t) => {
      const stub = sinon.stub().rejects(new Error('second'));
  
      await t.throws(
        finallyRejectsWithInitial(Promise.resolve(), stub),
        'second'
      );
      t.true(stub.calledOnce);
      stub.resetHistory();
  
      await t.throws(
        finallyRejectsWithInitial(Promise.reject(new Error('first')), stub),
        'first'
      );
      t.true(stub.calledOnce);
    });
  
    it('produces the original value', async (t) => {
      const stub = sinon.stub().returns('second');
  
      t.is(
        await finallyRejectsWithInitial(Promise.resolve('first'), stub),
        'first'
      );
    });
  
    it('handles synchronous exceptions', async (t) => {
      const stub = sinon.stub().throws(new Error('err 2'));
  
      await t.throws(finallyRejectsWithInitial(Promise.resolve(), stub), 'err 2');
      t.true(stub.calledOnce);
      stub.resetHistory();
  
      const measure = mark();
      await t.throws(
        finallyRejectsWithInitial(
          delay(10).then(() => Promise.reject(new Error('err 1'))),
          stub
        ),
        'err 1'
      );
      t.true(measure() >= 10);
      t.true(stub.calledOnce);
      stub.resetHistory();
    });
  
    it('waits for the returned Promise', async (t) => {
      const stub = sinon.stub().returns(delay(10, 'twelve'));
  
      const measure = mark();
      t.is(
        await finallyRejectsWithInitial(Promise.resolve('eleven'), stub),
        'eleven'
      );
      t.true(measure() >= 10);
      t.true(stub.calledOnce);
    });
  });
  
new_contents: import {describe} from 'ava-spec';
  
  import sinon from 'sinon';
  
  import {delay, finallyRejectsWithInitial} from '../lib/helpers';
  
  const mark = () =>
    ((start) => () =>
      ((end) => (end[0] - start[0]) * 1e3 + (end[1] - start[1]) / 1e6)(
        process.hrtime()
      ))(process.hrtime());
  
  describe('finallyRejectsWithInitial', (it) => {
    it('invokes the function', async (t) => {
      const spy = sinon.spy();
      await finallyRejectsWithInitial(Promise.resolve(), spy);
      t.true(spy.calledOnce);
      spy.resetHistory();
  
      await t.throws(
        finallyRejectsWithInitial(Promise.reject(new Error('test 1')), spy),
        'test 1'
      );
      t.true(spy.calledOnce);
      spy.resetHistory();
  
      await finallyRejectsWithInitial(delay(10), spy);
      t.true(spy.calledOnce);
    });
  
    it('prefers the original error', async (t) => {
      const stub = sinon.stub().rejects(new Error('second'));
  
      await t.throws(
        finallyRejectsWithInitial(Promise.resolve(), stub),
        'second'
      );
      t.true(stub.calledOnce);
      stub.resetHistory();
  
      await t.throws(
        finallyRejectsWithInitial(Promise.reject(new Error('first')), stub),
        'first'
      );
      t.true(stub.calledOnce);
    });
  
    it('produces the original value', async (t) => {
      const stub = sinon.stub().returns('second');
  
      t.is(
        await finallyRejectsWithInitial(Promise.resolve('first'), stub),
        'first'
      );
    });
  
    it('handles synchronous exceptions', async (t) => {
      const stub = sinon.stub().throws(new Error('err 2'));
  
      await t.throws(finallyRejectsWithInitial(Promise.resolve(), stub), 'err 2');
      t.true(stub.calledOnce);
      stub.resetHistory();
  
      const measure = mark();
      await t.throws(
        finallyRejectsWithInitial(
          delay(10).then(() => Promise.reject(new Error('err 1'))),
          stub
        ),
        'err 1'
      );
      t.true(measure() >= 10);
      t.true(stub.calledOnce);
      stub.resetHistory();
    });
  
    it('waits for the returned Promise', async (t) => {
      const stub = sinon.stub().returns(delay(10, 'twelve'));
  
      const measure = mark();
      t.is(
        await finallyRejectsWithInitial(Promise.resolve('eleven'), stub),
        'eleven'
      );
      t.true(measure() >= 10);
      t.true(stub.calledOnce);
    });
  });
  
subject: fix node < 8 compatibility