Effect Creator Assertions

The expectSaga API has assertions for most of the effect creators available in Redux Saga. You can reference effect creators in Redux Saga's docs here.

• take(pattern)
• take.maybe(pattern)
• put(action)
• put.resolve(action)
• call(fn, ...args)
• call([context, fn], ...args)
• apply(context, fn, args)
• cps(fn, ...args)
• cps([context, fn], ...args)
• fork(fn, ...args)
• fork([context, fn], ...args)
• spawn(fn, ...args)
• spawn([context, fn], ...args)
• join(task)
• select(selector, ...args)
• actionChannel(pattern, [buffer])
• race(effects)
• setContext(props)
• getContext(prop)

You can assert the return value of a saga via the returns method. This only works for the top-level saga under test, meaning other sagas that are invoked via call, fork, or spawn won't report their return value.

function* saga() {
  return { hello: 'world' };
}

it('returns a greeting', () => {
  return expectSaga(saga)
    .returns({ hello: 'world' })
    .run();
});