feat: add logger to the testing infrastructure

[fvranicTT]

Ticket

None

Problem description

Added logger to test infrastructure. Replaces print() statements with leveled logging using loguru. tt-metal uses the same logger, so it should provide the same level of user experience we're used to.

from helpers.logger import logger

logger.debug("Detailed info")
logger.info("Progress updates")
logger.warning("Unexpected but non-fatal")
logger.error("Test failures with details")

What's changed

• New logger module (tests/python_tests/helpers/logger.py) with configurable log levels
• CLI control: pytest --loguru-level=INFO to see logs in terminal (default: file-only)
• Easy to adjust verbosity: --loguru-level=DEBUG for local debugging
• Log files:
  • test_run.log - full session log (overwritten each run)
  • test_errors.log - persistent error log across runs
  • CI uploads both as artifacts on failure
• Replaced prints in helpers (utils.py, test_config.py, fused_golden.py, etc.) with appropriate log levels
• CI configuration: Default log level WARNING (via LOGURU_LEVEL env var)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring

Checklist

• All post commit CI passes
• Blackhole Post commit CI passes (if applicable)
• Assert validation Complied with assert doc (if applicable)

[github-actions]

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[Copilot]

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 5 comments.

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[Copilot]

configure_logger() writes to test_run.log with mode="w", but CI runs pytest with xdist (-n 10). Each worker process will reconfigure loguru and truncate the same file, so logs will be lost/corrupted and the uploaded artifact may be incomplete. Consider making log filenames worker-specific (e.g., include PYTEST_XDIST_WORKER/PID), or only let the controller process create/truncate the session log and have workers append (plus consider enqueue=True if sharing a sink).

[Copilot]

The CLI-provided level is not normalized, while the env var path is uppercased. If a user passes --loguru-level=info, it may not match loguru's expected level names consistently. Suggest normalizing level = level.upper() (and possibly validating against allowed values) when level is provided.

Suggested change

	level = os.environ.get("LOGURU_LEVEL", "INFO").upper()
	level = os.environ.get("LOGURU_LEVEL", "INFO")
	# Normalize log level to match loguru's expected uppercase names
	level = level.upper()

[Copilot]

Setting config.option.log_cli_level alone may not enable pytest live logging; without log_cli=True (or equivalent), users may still not see terminal logs even when --loguru-level is provided, contradicting the intended behavior described in this file and PR description. Consider also setting config.option.log_cli = True when log_level is not None.

Suggested change

	if log_level is not None:
	if log_level is not None:
	# Ensure live logging is enabled when a log level is provided.
	config.option.log_cli = True

[Copilot]

print_pcc is now ignored: passed_test(..., print_pcc=False) will still emit an INFO log for PCC on every call, which can get very noisy (especially under xdist) and changes the function’s existing behavior. Suggest gating this log behind if print_pcc: (and/or using logger.debug for the default path).

Suggested change

	logger.info("PCC: {:.6f} | format={}", pcc, output_data_format.name)
	if print_pcc:
	logger.info("PCC: {:.6f} | format={}", pcc, output_data_format.name)
	else:
	logger.debug("PCC: {:.6f} | format={}", pcc, output_data_format.name)

[Copilot]

CI runs pytest with xdist (-n 10), but the logger currently writes fixed filenames (test_run.log/test_errors.log) and truncates test_run.log each session. Under parallel workers this can lead to missing/overwritten logs, so these artifacts may be unreliable. Once logger output is made xdist-safe (e.g., per-worker filenames), update this upload step to include all worker log files (glob).