chore: added unit tests for visualize.py #21
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This pull request adds a new test for the decision tree visualization functionality. The test ensures that the printed representation of a sample decision tree matches the expected output.
Testing improvements:
test_show_tree, intests/decisiontree/test_visualize.pyto verify that theshow_treefunction outputs the correct tree structure using a sample decision tree and output snapshot comparison.sample_decision_treepytest fixture to provide a reusable sample tree for testing purposes.