fix(tests): add Python 3.8-3.10 datetime.fromisoformat compatibility

Add datetime wrapper in tests/wire/__init__.py to handle 'Z' suffix
for Python 3.8-3.10 compatibility. Python 3.10's datetime.fromisoformat()
doesn't support 'Z' suffix (added in 3.11), so we convert 'Z' to '+00:00'
automatically when the wire tests module is imported.

This allows generated test files to use datetime.fromisoformat('2024-01-15T09:30:00Z')
without modification, ensuring compatibility across all supported Python versions.

The wrapper class inherits from the original datetime class, so all other
datetime functionality remains unchanged.

Author: lukeocodes

tests/wire/__init__.py

@@ -0,0 +1,38 @@
+"""
+Wire tests module.
+
+This module patches datetime.fromisoformat() to handle 'Z' suffix for Python 3.10 compatibility.
+Python 3.10's datetime.fromisoformat() doesn't support 'Z' suffix (added in 3.11),
+so we convert 'Z' to '+00:00' automatically.
+
+This uses a module-level import hook to intercept datetime imports.
+"""
+
+import sys
+from datetime import datetime as _original_datetime
+
+# Store original function
+_original_fromisoformat = _original_datetime.fromisoformat
+
+
+def _patched_fromisoformat(date_string: str) -> _original_datetime:
+    """Patched version that converts 'Z' to '+00:00' for Python 3.10 compatibility."""
+    if date_string.endswith("Z"):
+        date_string = date_string[:-1] + "+00:00"
+    return _original_fromisoformat(date_string)
+
+
+# Create a wrapper datetime class that uses our patched fromisoformat
+class _DatetimeWrapper(_original_datetime):
+    """Wrapper class that patches fromisoformat for Python 3.10 compatibility."""
+
+    @staticmethod
+    def fromisoformat(date_string: str) -> _original_datetime:
+        """Patched fromisoformat that handles 'Z' suffix."""
+        return _patched_fromisoformat(date_string)
+
+
+# Replace datetime in the datetime module's __dict__ by creating a wrapper module
+# This intercepts imports of 'from datetime import datetime'
+_datetime_module = sys.modules["datetime"]
+_datetime_module.datetime = _DatetimeWrapper