allow ab13fd_example to warn about computation of beta(A)

slycot/tests/test_examples.py

@@ -13,9 +13,25 @@
 examplefunctions = [fun for (fname, fun) in getmembers(examples)
                     if isfunction(fun) and "_example" in fname]
 
+# Exempt certain functions to produce warnings with attributes (iwarn, info)
+#
+# Failed to compute beta(A) within the specified tolerance
+examples.ab13fd_example.allow_iwarninfo = [(None, 1)]
+
+
+def check_warn(recwarn, examplefun):
+    """Returns True if a warning occurs that is not exempt"""
+    for w in recwarn:
+        try:
+            if (w.message.iwarn, w.message.info) in examplefun.allow_iwarninfo:
+                continue
+        except AttributeError:
+            pass
+        return True
+
 
-#ignore numpy ABI changes https://github.com/numpy/numpy/pull/432
 @pytest.mark.parametrize('examplefun', examplefunctions)
+#ignore numpy ABI change warnings https://github.com/numpy/numpy/pull/432
 @pytest.mark.filterwarnings("ignore:numpy.dtype size changed")
 @pytest.mark.filterwarnings("ignore:numpy.ufunc size changed")
 def test_example(examplefun, capsys, recwarn):
@@ -32,7 +48,7 @@ def test_example(examplefun, capsys, recwarn):
     failconditions = [
         ((not len(captured.out) > 0), "Example {} did not print any results\n"),
         (captured.err, "Example {} wrote to stderr\n"),
-        (recwarn,  "Example {} produced a warning.\n")]
+        (check_warn(recwarn, examplefun), "Example {} produced a warning.\n")]
     for failed, msgfmt  in failconditions:
         if failed:
             pytest.fail(msgfmt.format(examplefun.__name__) +