[Solved] What is wrong with this Angular test provider setup?providers: [{ provide: RealService, useValue: MockService }] | Angular

Angular - Testing

What is wrong with this Angular test provider setup?

providers: [{ provide: RealService, useValue: MockService }]

AMissing import for RealService

BuseValue expects an instance, not a class reference

CuseValue cannot be used in providers

Dprovide should be MockService, not RealService

Step-by-Step Solution

Solution:

Step 1: Understand useValue usage
useValue expects an actual instance or object, not a class reference.
Step 2: Identify the mistake
MockService is a class, but useValue is given the class itself, not an instance like new MockService().
Final Answer:
useValue expects an instance, not a class reference -> Option B
Quick Check:
useValue needs instance, not class [OK]

Quick Trick: useValue needs instance (new), not class name [OK]

Common Mistakes:

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