move test_mc to pytest

This fixes a failure with -Werror not taking into account that the warning is expected

slycot/tests/test_mc.py

@@ -2,53 +2,44 @@
 # test_mc.py - test suite for polynomial and rational function manipulation
 # bnavigator <[email protected]>, Aug 2019
 
-import unittest
-import warnings
+import pytest
+import re
 
 from slycot import mc01td
-
-
-class test_mc(unittest.TestCase):
-
-    def test_mc01td(self):
-        """ test_mc01td: doc example
-        data from http://slicot.org/objects/software/shared/doc/MC01TD.html
-        """
-        (dp, stable, nz) = mc01td('C', 4, [2, 0, 1, -1, 1])
-        self.assertEqual(dp, 4)
-        self.assertEqual(stable, 0)
-        self.assertEqual(nz, 2)
-
-    def test_mc01td_D(self):
-        """ test_mc01td_D: test discrete option """
-        (dp, stable, nz) = mc01td('D', 3, [1, 2, 3, 4])
-        self.assertEqual(dp, 3)
-        self.assertEqual(stable, 1)
-        self.assertEqual(nz, 0)
-        (dp, stable, nz) = mc01td('D', 3, [4, 3, 2, 1])
-        self.assertEqual(dp, 3)
-        self.assertEqual(stable, 0)
-        self.assertEqual(nz, 3)
-
-    def test_mc01td_warnings(self):
-        """ test_mc01td_warnings: Test warnings """
-        T = [([0, 0], "\n"
-              "Entry ``P(x)`` is the zero polynomial."),
-             ([0, 1], "\n"
-              "The polynomial ``P(x)`` is most probably unstable,\n"
-              "although it may be stable with one or more zeros\n"
-              "very close to the imaginary axis.\n"
-              "The number of unstable zeros (NZ) is not determined."),
-             ([1, 0], "\n"
-              "The degree of the polynomial ``P(x)`` has been\n"
-              "reduced to ``(DB - 1)`` because\n"
-              "``P(DB+1-j) = 0.0`` on entry\n"
-              "for ``j = 0, 1,..., k-1`` and ``P(DB+1-k) <> 0.0``.")]
-        for P, m in T:
-            with warnings.catch_warnings(record=True) as w:
-                (dp, stable, nz) = mc01td('C', len(P)-1, P)
-                self.assertEqual(str(w[0].message), m)
-
-
-if __name__ == "__main__":
-    unittest.main()
+from slycot.exceptions import SlycotResultWarning
+
+
+def test_mc01td():
+    """ test_mc01td: doc example
+    data from http://slicot.org/objects/software/shared/doc/MC01TD.html
+    """
+    (dp, stable, nz) = mc01td('C', 4, [2, 0, 1, -1, 1])
+    assert dp == 4
+    assert stable == 0
+    assert nz == 2
+
+def test_mc01td_D():
+    """ test_mc01td_D: test discrete option """
+    (dp, stable, nz) = mc01td('D', 3, [1, 2, 3, 4])
+    assert dp == 3
+    assert stable == 1
+    assert nz == 0
+    (dp, stable, nz) = mc01td('D', 3, [4, 3, 2, 1])
+    assert dp == 3
+    assert stable == 0
+    assert nz == 3
+
+def test_mc01td_warnings():
+    """ test_mc01td_warnings: Test warnings """
+    T = [([0, 0], "Entry ``P(x)`` is the zero polynomial."),
+         ([0, 1], "The polynomial ``P(x)`` is most probably unstable,\n"
+                  "although it may be stable with one or more zeros\n"
+                  "very close to the imaginary axis.\n"
+                  "The number of unstable zeros (NZ) is not determined."),
+         ([1, 0], "The degree of the polynomial ``P(x)`` has been\n"
+                  "reduced to ``(DB - 1)`` because\n"
+                  "``P(DB+1-j) = 0.0`` on entry\n"
+                  "for ``j = 0, 1,..., k-1`` and ``P(DB+1-k) <> 0.0``.")]
+    for P, m in T:
+        with pytest.warns(SlycotResultWarning, match=re.escape(m)):
+            (dp, stable, nz) = mc01td('C', len(P)-1, P)