Testing error handling? about redux-saga HOT 7 CLOSED

The best thing I can think of is trying to mock the call function to just throw an error

You don't have to mock, yield call(...) doesn't execute anything, to test the generator you provide it with dummy responses. To simulate a promise rejection, call throw on the iterator

const cart = {}
const getState = () => ({cart})
const iterator = checkout(getState)

assert.deepEqual(iterator.next().value, take(types.CHECKOUT_REQUEST))
assert.deepEqual(iterator.next(actions.checkoutRequest()).value, call(api.buyProducts, cart) )
// simulate a promise rejection
assert.deepEqual(iterator.throw('error').value, put(actions.checkoutFailure('error')))

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Can this go in the docs? Please?

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sorry, didnt mean to close it

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Ah, awesome! Thanks so much for the quick response. That makes a lot of sense.

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this doesn't work if you're running mocha/chai synchronously. iterator.throw('error') itself causes the error Error: the string "error" was thrown, throw an Error :)

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@worc
Just use iterator.throw(new Error('error'))

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with that e is still undefined in the catch block.

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