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Tests failing on fresh install: TypeError in test_spi.py and test_uart.py #257
Description
Hi! I am setting up the development environment for GSoC. While running the tests locally on Windows, I encountered errors in the SPI and UART test modules.
It appears that SPIMaster._frequency and UART._baudrate are methods (functions), but the test code attempts to multiply/divide them directly as if they were integers. This causes the test collection to fail.
Steps to reproduce the behavior:
- Clone repository
- Install dependencies:
pip install -e . - Run tests:
python -m pytest
Error Log
___________________________________________________________________ ERROR collecting tests/test_spi.py ____________________________________________________________________ tests\test_spi.py:33: in PWM_FERQUENCY = SPIMaster._frequency * 2 / 3 E TypeError: unsupported operand type(s) for *: 'method' and 'int'
___________________________________________________________________ ERROR collecting tests/test_uart.py ___________________________________________________________________ tests\test_uart.py:19: in PWM_FERQUENCY = UART._baudrate // 2 E TypeError: unsupported operand type(s) for //: 'method' and 'int'
Expected behavior
The tests should collect and run without TypeErrors.
Environment
- OS: Windows
- Python Version: 3.14.0
Activity
saadiqbal09 commentedon Dec 25, 2025
Thanks for the detailed analysis and fix!
I was also exploring this issue as part of my GSoC 2026 preparation
and learned a lot about the SPI/UART test setup.
Looking forward to contributing to PSLab in other areas.
Great work 👍
TejasAnalyst commentedon Feb 9, 2026
Hi, I have submitted a fix for this in PR #263.
The TypeError was happening because the tests were trying to do math on the method object itself instead of its return value.
I have updated the tests to use realistic static values (100kHz for SPI, 500kHz for UART), which resolves the crash on fresh install.
Please review PR #263.
saad-aids commentedon Mar 28, 2026
@pslab-python-maintainers Hi! Saad here (PR #282 - CTMU calibration contributor).
Claiming #257 for GSoC 2026 PSLab project. Reproducing locally now.
Fix plan: Auto-detect port in test fixture (serial.tools.list_ports).
PR Soon! Thanks! 🙏