add comment explaining conftest.py

benchexec/tablegenerator/conftest.py

@@ -5,14 +5,17 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
+# The following code is intended for use in pytest sessions and ensures consistent rounding behavior during tests.
+# It sets the rounding mode to ROUND_HALF_UP for both the DefaultContext and the local context at the start of the session.
+# This helps maintain reproducibility in test results by avoiding discrepancies in rounding behavior across different environments or configurations.
+# The use of pytest_sessionstart hook from `conftest.py` ensures that this setup is applied globally at the beginning of each test session.
+
 import decimal
 
-# Store the original rounding values
 original_default_rounding = decimal.DefaultContext.rounding
 original_local_rounding = decimal.getcontext().rounding
 
 
 def pytest_sessionstart(session):
-    # Set both DefaultContext and local context rounding to ROUND_HALF_UP at the beginning of the test session
     decimal.DefaultContext.rounding = decimal.ROUND_HALF_UP
     decimal.getcontext().rounding = decimal.ROUND_HALF_UP