[Bug]: expect.hasAssertions() resturns true even if expect() as not evaluated #15484
Closed as not planned
Description
Version
29.5.0
Steps to reproduce
If you test an observable, you would like to ensure, that the expect() assertion is actually executed and evaluated. Based on the docu, this can be achieved by calling expect.hasAssertions()
In the first example below you see, that the "toEqual" assertion is FALSE. Nevertheless the Test runs through and shows green.
The second test('not a bug') is just to show, that this bug is NOT about the expect() assertion in the subscribe block and how to solve testing observables' BUT about the "hasAssertion()" which should fail in the first test.
test('bug',` () => {
const x = new ReplaySubject();
expect.hasAssertions() //OK - ALTHOUGH EXPECT IS INCORRECT AND NOT EVALUATED OR EVALUATED TOO LATE
x.next("CORRECT")
x.subscribe( val => {
expect(val).toEqual("WRONG") //NOT EVALUATED OR EVALUATED TOO LATE
})
});
//WORKING SOLUTION - BUT NOT SOLVING THE PROBLEM
test('not a bug', (done) => {
const x = new ReplaySubject();
expect.hasAssertions()
x.next("CORRECT")
x.subscribe( val => {
expect(val).toEqual("WRONG") //EVALUATED
done()
})
}); Expected behavior
Both tests fail.
First one with expect.hasAssertions() failing.
Second one with expect.toEqual failing.
Actual behavior
First test is green (wrong).
Second red (as expected).
Additional context
No response
Environment
jest 29.5.0