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  3. Unit Testing for Data Science in Python

Exercise

Mark a test as conditionally skipped

In Python 2, there was a built-in function called xrange(). In Python 3, xrange() was removed. Therefore, if any test uses xrange(), it's going to fail with a NameError in Python 3.

Remember the function get_data_as_numpy_array()? You saw it in Chapter 2. It converted data in a preprocessed data file into a NumPy array.

range() has been deliberately replaced with the obsolete xrange() in the function. Evil laughter! But no worries, it will be changed back after you're done with this exercise.

You wrote a test called test_on_clean_file() for this function. This test currently resides in a test class TestGetDataAsNumpyArray inside the test module features/test_as_numpy.py.

pytest, numpy as np and get_data_as_numpy_array() has been imported for you.

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Question

Run the tests in the test class TestGetDataAsNumpyArray in the IPython console. What is the outcome?

Possible answers