migrate from unittest to pytest (#140)

* migrate unittest to pytest

* fix typo in test name

Author: solegalli

boruta/test/test_boruta.py

@@ -0,0 +1,67 @@
+import numpy as np
+import pandas as pd
+import pytest
+from sklearn.ensemble import RandomForestClassifier
+
+from boruta import BorutaPy
+
+
+@pytest.mark.parametrize("tree_n,expected", [(10, 44), (100, 141)])
+def test_get_tree_num(tree_n, expected):
+    rfc = RandomForestClassifier(max_depth=10)
+    bt = BorutaPy(rfc)
+    assert bt._get_tree_num(tree_n) == expected
+
+
+@pytest.fixture(scope="module")
+def Xy():
+    np.random.seed(42)
+    y = np.random.binomial(1, 0.5, 1000)
+    X = np.zeros((1000, 10))
+
+    z = (y - np.random.binomial(1, 0.1, 1000) +
+         np.random.binomial(1, 0.1, 1000))
+    z[z == -1] = 0
+    z[z == 2] = 1
+
+    # 5 relevant features
+    X[:, 0] = z
+    X[:, 1] = (y * np.abs(np.random.normal(0, 1, 1000))
+               + np.random.normal(0, 0.1, 1000))
+    X[:, 2] = y + np.random.normal(0, 1, 1000)
+    X[:, 3] = y**2 + np.random.normal(0, 1, 1000)
+    X[:, 4] = np.sqrt(y) + np.random.binomial(2, 0.1, 1000)
+
+    # 5 irrelevant features
+    X[:, 5] = np.random.normal(0, 1, 1000)
+    X[:, 6] = np.random.poisson(1, 1000)
+    X[:, 7] = np.random.binomial(1, 0.3, 1000)
+    X[:, 8] = np.random.normal(0, 1, 1000)
+    X[:, 9] = np.random.poisson(1, 1000)
+
+    return X, y
+
+
+def test_if_boruta_extracts_relevant_features(Xy):
+    X, y = Xy
+    rfc = RandomForestClassifier()
+    bt = BorutaPy(rfc)
+    bt.fit(X, y)
+    assert list(range(5)) == list(np.where(bt.support_)[0])
+
+
+def test_if_it_works_with_dataframe_input(Xy):
+    X, y = Xy
+    X_df, y_df = pd.DataFrame(X), pd.Series(y)
+    bt = BorutaPy(RandomForestClassifier())
+    bt.fit(X_df, y_df)
+    assert list(range(5)) == list(np.where(bt.support_)[0])
+
+
+def test_dataframe_is_returned(Xy):
+    X, y = Xy
+    X_df, y_df = pd.DataFrame(X), pd.Series(y)
+    rfc = RandomForestClassifier()
+    bt = BorutaPy(rfc)
+    bt.fit(X_df, y_df)
+    assert isinstance(bt.transform(X_df, return_df=True), pd.DataFrame)

boruta/test/unit_tests.py

@@ -0,0 +1,7 @@
+-r requirements.txt
+pytest>=5.4.1
+
+# repo maintenance tooling
+black>=21.5b1
+flake8>=3.9.2
+isort>=5.8.0