[ENH] Test anomaly_detection estimator _fit_predict in general testing #2801
Description
Describe the feature or idea you want to propose
This is currently not tested. This should only test estimators when the _fit_predict function is overridden from the base class, no need to test default functionality. Should check that the overridden functions runs as expected, and produced the same output as .fit().predict().
Describe your proposed solution
Write a test and add it the AD checks in the testing module
Describe alternatives you've considered, if relevant
No response
Additional context
No response