Angular - Testing
You want to mock a service method that returns different values on consecutive calls in Angular tests. Which approach correctly achieves this?
You want to mock a service method that returns different values on consecutive calls in Angular tests. Which approach correctly achieves this?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand requirement for different returns
Returning different values on consecutive calls requires state tracking inside the mock method.Step 2: Choose correct mocking approach
A mock class with a call count variable can track calls and return different values accordingly.Step 3: Evaluate other options
useValue with fixed return can't vary returns; overriding real service method is complex; spying alone doesn't mock service.Final Answer:
Create a mock class with a method using a call count variable to return different values -> Option AQuick Check:
Mock class with state tracks calls for varied returns [OK]
Quick Trick: Use mock class with call count to vary method returns [OK]
Common Mistakes:
- Using fixed return object for varying outputs
- Overriding real service instead of mocking
- Relying only on spies without mocks
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