Why does my Flutter Mocktail test throw a _typeError?

"Why does my Flutter Mocktail test throw a _TypeError?"

The "_TypeError" in your Flutter Mocktail test is often due to incorrect mocking or null safety issues. Here are some common reasons and how to address them:

Incorrect Mocking: Ensure that you are correctly mocking the methods and returning appropriate values. For example, if a method returns a Future, make sure the mock returns a Future as well.

Null Safety: If your project is using null safety, ensure that all mocked methods handle null values correctly. This includes returning non-null values when expected and handling nulls appropriately.

Method Signatures: Verify that the method signatures in your mocks match the actual method signatures in your code. Any discrepancy can lead to type errors.

Mocktail Syntax: Double-check the syntax used in Mocktail to set up your mocks. Ensure that you are using the correct methods and parameters.

By addressing these areas, you should be able to resolve the "_TypeError" in your Flutter Mocktail test.