Testing services with httpMock

Angular's HttpClient Testing in depthng-conf May 1st-3rd 2019 - The World's Original Angular Conference

How to debug expectOne

Error: Expected one matching request for criteria "Match by function: ", found none.

Not very explicit it fact the expected url is not matching exactly the mocked url.

A way to debug that is to use the form with a custom function that allows to do the matching by hand

const req = httpMock.expectOne((request: any) => {
   // Here we test urlWithParams and not url
   return request.urlWithParams === expectedUrl + addedParams;
});