I have a function like this:
let settings = {
isRun: false
}
function testPromise(promise) {
settings.isRun = true;
return promise.finally(() => settings.isRun = false;)
}
How can test isRun = true when run testPromise before finally expression run. I tried with
it('should isRun true when testPromise running', async () => {
expect(settings.isRun).toBeFalsy();
await testPromise(Promise.resolve('run')).then(() => {
expect(settings.isRun).toBeTruthy();
}
expect(settings.isRun).toBeFalsy();
but it does not work
I think you can execute but not wait for the promise to observe the intermittent value change you want to see.
it('should isRun true when testPromise running', () => {
expect(settings.isRun).toBeFalsy();
const promise = testPromise(Promise.resolve('run'));
// At this point, promise is not resolved yet, so the callback in finally has not executed yet.
expect(settings.isRun).toBeTruthy();
// If you want to test it changed back to fasle
promise.then(() => {
expect(settings.isRun).toBeFalsy();
});
}