Add compatibility for Python < 3.2

Previous commit renamed `assertRegexpMatches` to `assertRegex` as
the former has been removed in Python 3.12.

However, at the time of writing, not all CI build agents have been
upgraded to Python >= 3.2. At the same time, some agents have
Python 3.12 and cannot be easily downgraded (e.g., RISC-V).

This commit provides a compatibility with Python < 3.2 by implementing
`assertRegex` by means of `assertRegexpMatches` if `assertRegex` is not
available.

This way, JitBuilder API gen tests should pass everywhere. Once all CI
nodes are upgraded, this commit can be reverted.

jitbuilder/apigen/test/cppgentests.py

@@ -28,6 +28,16 @@
 import genutils
 import cppgen
 
+# Method assertRegexpMatches has been deprecated in Python 3.2 and compatibility
+# alias was apparently removed in Python 3.12.
+#
+# However not all CI build agents have been upgraded to Python 3.2 while some
+# only have Python 3.12+ and cannot be easily downgraded (e.g., RISC-V agents).
+#
+# The code belows provides compatibility for Python < 3.2
+if not hasattr(unittest.TestCase, "assertRegex") and hasattr(unittest.TestCase, "assertRegexpMatches"):
+    setattr(unittest.TestCase, "assertRegex", unittest.TestCase.assertRegexpMatches)
+
 class CppGeneratorTest(unittest.TestCase):
     """Tests for CppGenerator class"""