diff --git a/.github/workflows/python.yaml b/.github/workflows/python.yaml
index a0130b9..2e58415 100644
--- a/.github/workflows/python.yaml
+++ b/.github/workflows/python.yaml
@@ -32,8 +32,8 @@ jobs:
           ${{ runner.os }}-
     - run: |
         python -m pip install --upgrade pip
-        pip install nose
+        pip install pytest
         pip install --only-binary :all: scikit-learn==${{ matrix.sklearn }}
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - run: |
-        nosetests
+        pytest
diff --git a/sklearn2pmml/cross_reference/tests/__init__.py b/sklearn2pmml/cross_reference/tests/test_cross_reference.py
similarity index 100%
rename from sklearn2pmml/cross_reference/tests/__init__.py
rename to sklearn2pmml/cross_reference/tests/test_cross_reference.py
diff --git a/sklearn2pmml/decoration/tests/__init__.py b/sklearn2pmml/decoration/tests/test_decoration.py
similarity index 100%
rename from sklearn2pmml/decoration/tests/__init__.py
rename to sklearn2pmml/decoration/tests/test_decoration.py
diff --git a/sklearn2pmml/ensemble/tests/__init__.py b/sklearn2pmml/ensemble/tests/test_ensemble.py
similarity index 100%
rename from sklearn2pmml/ensemble/tests/__init__.py
rename to sklearn2pmml/ensemble/tests/test_ensemble.py
diff --git a/sklearn2pmml/expression/tests/__init__.py b/sklearn2pmml/expression/tests/test_expression.py
similarity index 100%
rename from sklearn2pmml/expression/tests/__init__.py
rename to sklearn2pmml/expression/tests/test_expression.py
diff --git a/sklearn2pmml/feature_extraction/text/tests/__init__.py b/sklearn2pmml/feature_extraction/text/tests/test_text.py
similarity index 100%
rename from sklearn2pmml/feature_extraction/text/tests/__init__.py
rename to sklearn2pmml/feature_extraction/text/tests/test_text.py
diff --git a/sklearn2pmml/feature_selection/tests/__init__.py b/sklearn2pmml/feature_selection/tests/test_feature_selection.py
similarity index 100%
rename from sklearn2pmml/feature_selection/tests/__init__.py
rename to sklearn2pmml/feature_selection/tests/test_feature_selection.py
diff --git a/sklearn2pmml/metrics/tests/__init__.py b/sklearn2pmml/metrics/tests/test_metrics.py
similarity index 100%
rename from sklearn2pmml/metrics/tests/__init__.py
rename to sklearn2pmml/metrics/tests/test_metrics.py
diff --git a/sklearn2pmml/pipeline/tests/__init__.py b/sklearn2pmml/pipeline/tests/test_pipeline.py
similarity index 100%
rename from sklearn2pmml/pipeline/tests/__init__.py
rename to sklearn2pmml/pipeline/tests/test_pipeline.py
diff --git a/sklearn2pmml/postprocessing/tests/__init__.py b/sklearn2pmml/postprocessing/tests/test_postprocessing.py
similarity index 100%
rename from sklearn2pmml/postprocessing/tests/__init__.py
rename to sklearn2pmml/postprocessing/tests/test_postprocessing.py
diff --git a/sklearn2pmml/preprocessing/tests/__init__.py b/sklearn2pmml/preprocessing/tests/test_preprocessing.py
similarity index 100%
rename from sklearn2pmml/preprocessing/tests/__init__.py
rename to sklearn2pmml/preprocessing/tests/test_preprocessing.py
diff --git a/sklearn2pmml/ruleset/tests/__init__.py b/sklearn2pmml/ruleset/tests/test_ruleset.py
similarity index 100%
rename from sklearn2pmml/ruleset/tests/__init__.py
rename to sklearn2pmml/ruleset/tests/test_ruleset.py
diff --git a/sklearn2pmml/tests/__init__.py b/sklearn2pmml/tests/test_sklearn2pmml.py
similarity index 100%
rename from sklearn2pmml/tests/__init__.py
rename to sklearn2pmml/tests/test_sklearn2pmml.py
diff --git a/sklearn2pmml/tree/tests/__init__.py b/sklearn2pmml/tree/tests/test_chaid.py
similarity index 100%
rename from sklearn2pmml/tree/tests/__init__.py
rename to sklearn2pmml/tree/tests/test_chaid.py
diff --git a/sklearn2pmml/util/tests/__init__.py b/sklearn2pmml/util/tests/test_util.py
similarity index 98%
rename from sklearn2pmml/util/tests/__init__.py
rename to sklearn2pmml/util/tests/test_util.py
index ec50c3d..1cfa7e7 100644
--- a/sklearn2pmml/util/tests/__init__.py
+++ b/sklearn2pmml/util/tests/test_util.py
@@ -79,9 +79,9 @@ def test_fqn(self):
 		self.assertEqual("builtins.str", fqn(obj))
 
 		obj = Dummy()
-		self.assertEqual("sklearn2pmml.util.tests.Dummy", fqn(Dummy))
+		self.assertEqual("test_util.Dummy", fqn(Dummy))
 		self.assertEqual("builtins.type", fqn(Dummy.__class__))
-		self.assertEqual("sklearn2pmml.util.tests.Dummy", fqn(obj))
+		self.assertEqual("test_util.Dummy", fqn(obj))
 
 	def test_inline_expr(self):
 		expr = "-1 if (X[0] < 0) else (1 if (X[0] > 0) else 0)"