it('dose nothing if argument is none', (done) => {
   sush.flow([
     SUSHPluginAddObject()
   ])
   .then(() => {
     done();
   })
   .catch((err) => done(err));
 });

 it('throws Error when sheetUrl is invalid URL', (done) => {
   sush.flow([
     SUSHPluginSpreadsheet({ sheetUrl: 'https://example.com' })
   ])
   .catch((err: Error) => {
     assert.equal(err.message, 'sheetUrl is invalid.');
     done();
   })
   .catch((err) => done(err));
 });

 it('throws error if not match and not set fallback', (done) => {
   sush.flow([
     SUSHPluginRedirect()
   ])
   .catch((err: Error) => {
     assert.ok(err.message.match(/not found/));
     done();
   })
   .catch((err) => done(err));
 });

 it('does nothing when analyticsId is none', (done) => {
   sush.flow([
     SUSHPluginGoogleAnalytics()
   ])
   .then(() => {
     // never calls ga
     td.verify(ga(), { times: 0, ignoreExtraArgs: true });
     done();
   })
   .catch((err) => done(err));
 });

  it('trims tail of id if tail param is avaliable', (done) => {
    const expected = '/exam';

    sush.flow([
      SUSHPluginTrimId({ tail: 3 }),
      ({ id: actual, stock }) => {
        assert.strictEqual(actual, expected);
        return { id: actual, stock };
      }
    ])
    .then(() => done())
    .catch((err) => done(err));
  });