react native - How to test a Saga with an API call? -


i have saga

export function* mysaga(api, action) {   const response = yield call(api.service, action);   yield put(navactions.goto('page', { success: response.ok })); }

that calls api , return value navigate screen passing api call result (response.ok).

it('test', () => {   // ...    const gen = mysaga(api, action);   const step = () => gen.next().value;    // doesn't run api   const response = call(api.service, {});    expect(step()).tomatchobject(response); // ok    // error, cannot read property 'ok' of undefined   expect(step()).tomatchobject(     put(navactions.goto('page', { success: response.ok }))   ); });

since it's not running api call response doesn't defined.

i don't know should test scenario.

how test second step of saga?

by default, yield expression resolves whatever yielded. however, can pass value gen.next method , yield expression resolved passed there.

so should trick (untested):

const gen = rootsaga(api, action); const step = (val) => gen.next(val).value;  const mockresponse = { ok: true }; const response = call(api.service, {});  expect(step(mockresponse)).tomatchobject(response); // ok  expect(step()).tomatchobject(   put(navactions.goto('page', { success: true })) );

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