Tests failing on fresh install: TypeError in test_spi.py and test_uart.py

[SehajModi]

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:

1. Clone repository
2. Install dependencies: pip install -e .
3. 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

[saadiqbal09]

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]

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]

@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! 🙏