Tips for verifying method calls in Jasmine unit tests?

As a beginner in unit testing, I find asynchronous method checks confusing even after reading the documentation. My understanding is that I can use runs() and wait() for this purpose, but an alternative approach could be to use spyOn to verify if the method has been called.

Here is the code snippet that I want to test:


... (Code snippet hidden for brevity)

So far, I have attempted to write some test cases, but my knowledge on how to effectively test them is limited:


it('search treatment should have been called and return a value'),function(){
  scope.searchTreatments();
}

it('it should create medical service after submitting the form'),function(){
  scope.createMedicalServices();
  runs
}

Essentially, my main goal is to ensure that the method is being executed correctly, especially since the createMedicalService function is triggered when the user submits the form. Any help or suggestions would be highly appreciated!

Answer №1

While unit testing may initially seem daunting, there are several key principles that can simplify the process.

Focus on Singular Purpose. It is essential for a component to serve just one function. Consider breaking down your code into smaller segments and moving complex logic from controllers to factories or services, allowing for individual testing.

Embrace Inversion of Control. AngularJS excels in providing IoC integration. By passing dependencies as stubs, fakes, or mocks into units, you can effectively test their behavior.

Limit Testing to Interfaces. Avoid testing the internal structure of a unit, as this assesses implementation rather than functionality. For instance, if a controller calls a method from a service, create a stub for the service, spy on the method being called, and verify the interaction during testing.

The ultimate goal is to confirm that when input is provided to a unit, the expected output is produced with precision.

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