June 2019
Intermediate to advanced
746 pages
17h 2m
German
Content preview from Angular, 2nd Edition
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17.2.8Abhängigkeiten durch Mocks ersetzen
- Was – Wir beweisen, dass der erweiterte BookStoreService alle Bücher weiterreicht und dabei auch garantiert den HttpClient verwendet – und sich beispielsweise nicht aus einer Liste von fest einprogrammierten Büchern bedient.
- Wie – Unit-Test mit Mock unter Verwendung von TestBed
- Warum – Der BookStoreService benötigt einen HttpClient. Wir stellen als Ersatz einen Mock zur Verfügung und verifizieren das Verhalten. Die Abhängigkeit wird über TestBed bereitgestellt.
Verhalten verifizieren
Mit dem vorherigen Unit-Test mit Stub wollten wir sicherstellen, dass unser BookStoreService die erwarteten Bücher zurückliefert. Wir haben den Endzustand kontrolliert, und es lagen uns die erwarteten zwei Bücher vor. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.