The Testing Pyramid, shown in the Figure, illustrates how your app should include the three categories of tests: small, medium, and large. Small tests are unit tests that:

The Testing Pyramid, shown in the Figure, illustrates how your app should include the three categories of tests: small, medium, and large. Small tests are unit tests that:

A . validate your app’s behavior one class at a time.
B . validate either interactions between levels of the stack within a module, or interactions between related modules.
C . validate user journeys spanning multiple modules of your app.

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Answer: A