Skip hypothesis tests in environments without hypothesis installed

Fedora/EPEL RPM builds in Packit run %check without test-only deps
on the buildroot. The collection step blew up trying to import
hypothesis on rawhide and the rest of the matrix would have followed.

pytest.importorskip is the standard idiom here: collects the module
only if hypothesis is on the path, skips cleanly with a clear reason
otherwise. GH Actions installs hypothesis via requirements.txt so
the tests still run there; downstream packagers no longer need to
care about it.

Author: timlnx

tests/test_hypothesis_properties.py

@@ -42,9 +42,16 @@
 
 import math
 
-from hypothesis import given, settings, strategies as st
+import pytest
 
-import bitmath
+# Downstream packagers (Fedora/EPEL RPM builds) run %check without
+# installing test-only dependencies. Skip the whole module when
+# hypothesis isn't on the path rather than failing collection.
+pytest.importorskip("hypothesis")
+
+from hypothesis import given, settings, strategies as st  # noqa: E402
+
+import bitmath  # noqa: E402
 
 
 # Bracketed to avoid values that Python's str() renders in scientific