Convert static libpython test to proper unittest

.github/workflows/CI.yml

@@ -132,7 +132,7 @@ jobs:
       - name: "Install Coverage tool"
         run: python3 -m pip install coverage coveralls
       - name: "Ensure that static libpython warning appears"
-        run: coverage run --source=pysr --omit='*/feynman_problems.py' test/test_static_libpython_warning.py
+        run: coverage run --source=pysr --omit='*/feynman_problems.py' -m unittest test.test_static_libpython_warning.py
       - name: "Run tests"
         run: coverage run --append --source=pysr --omit='*/feynman_problems.py' -m unittest test.test
       - name: Coveralls

test/test_static_libpython_warning.py

@@ -1,13 +1,20 @@
-"""Test that running PySR with static libpython raises a warning."""
+"""Test that running PySR with static libpython raises a warning.
 
+Note: This test will ONLY pass with statically-linked python binaries, such
+as provided by conda. It will not pass on other versions of python, and that is
+okay."""
+
+import unittest
 import warnings
 import pysr
 
 # Taken from https://stackoverflow.com/a/14463362/2689923
-with warnings.catch_warnings(record=True) as warning_catcher:
-    warnings.simplefilter("always")
-    pysr.sr.init_julia()
+class TestLibpythonWarning(unittest.TestCase):
+    def test_warning(self):
+        with warnings.catch_warnings(record=True) as warning_catcher:
+            warnings.simplefilter("always")
+            pysr.sr.init_julia()
 
-    assert len(warning_catcher) == 1
-    assert issubclass(warning_catcher[-1].category, UserWarning)
-    assert "static" in str(warning_catcher[-1].message)
+            self.assertEqual(len(warning_catcher), 1)
+            self.assertTrue(issubclass(warning_catcher[-1].category, UserWarning))
+            self.assertIn("static", str(warning_catcher[-1].message))