Fixed incorrect test codes.

[fatihsen20]

Code of Conduct

Fix.

Description

Test codes with errors (or usage may have changed) have been fixed.

Related issues or pull requests

None

Pull Request Checklist

• Added a note about the modification or contribution to the ./docs/sources/CHANGELOG.md file (if applicable)
• Added appropriate unit test functions in the ./mlxtend/*/tests directories (if applicable)
• Modify documentation in the corresponding Jupyter Notebook under mlxtend/docs/sources/ (if applicable)
• Ran PYTHONPATH='.' pytest ./mlxtend -sv and make sure that all unit tests pass (for small modifications, it might be sufficient to only run the specific test file, e.g., PYTHONPATH='.' pytest ./mlxtend/classifier/tests/test_stacking_cv_classifier.py -sv)
• Checked for style issues by running flake8 ./mlxtend

[fatihsen20]

Before fixing:

After fixing:

test_fpbase.py

Change the code:
dfs = self.df.astype(pd.SparseDtype("int", np.nan))
dfs = self.df.astype(pd.SparseDtype("int", 0))
because the na_value of the "int" variable in the pd.SparseDtype() function must be 0. You can look at the document

Change the compare_dataframes() function:
assert_array_equal() function was not working correctly. To fix this error, I replaced it with the compare_dataframes() function I wrote in "test_hmine.py".

Error Codes:

[rasbt]

Thanks so much for the update, the assert_array_equal() function was not working correctly issue was a sneaky one.

[codecov]

Codecov Report

Patch coverage: 53.84% and project coverage change: -0.02 ⚠️

Comparison is base (8ebfd31) 77.28% compared to head (e283a20) 77.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1026      +/-   ##
==========================================
- Coverage   77.28%   77.27%   -0.02%     
==========================================
  Files         200      200              
  Lines       11314    11307       -7     
  Branches     1487     1484       -3     
==========================================
- Hits         8744     8737       -7     
  Misses       2351     2351              
  Partials      219      219              

Impacted Files	Coverage Δ
mlxtend/frequent_patterns/tests/test_fpbase.py	94.80% <33.33%> (-3.86%)	⬇️
mlxtend/frequent_patterns/tests/test_hmine.py	100.00% <100.00%> (+11.53%)	⬆️

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