To debug a pytest test using pdb, you can manually insert a breakpoint by adding import pdb; pdb.set_trace() in your test:
import pytest
def divide(x, y):
return x / y
def test_zero_division():
import pdb
pdb.set_trace()
with pytest.raises(ZeroDivisionError):
divide(9, 0)
When running your tests, include the --pdb flag with the pytest command to enable interactive debugging:
pytest test_exception.py --pdb
This will initiate the pdb prompt at the point where the breakpoint is set:
...
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> PDB set_trace (IO-capturing turned off) >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> /Users/stanley/test_exception.py(12)test_zero_division()
-> with pytest.raises(ZeroDivisionError):
(Pdb)
Another way to set breakpoints is using the built-in breakpoint() function, which simplifies the process of setting breakpoints:
def test_zero_division():
breakpoint()
with pytest.raises(ZeroDivisionError):
divide(9, 0)
This method is often preferred for its simplicity compared to import pdb; pdb.set_trace().
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