Python test debugging is not working

[nandemoi]

Environment data

• VS Code version: 1.44.2
• Extension version (available under the Extensions sidebar): 2020.4.74986
• OS and version: macOS 10.15.4
• Python version (& distribution if applicable, e.g. Anaconda): 3.8.2
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): N/A

Expected behaviour

starting debugging

Actual behaviour

as #7927, the debugging tool bar disappeared

Steps to reproduce:

[NOTE: Self-contained, minimal reproducing code samples are extremely helpful and will expedite addressing your issue]

same as #7927

[int19h]

Can you please provide more information about the issue? In particular, the repro steps - including your launch.json, and, if possible the code that you're trying to debug.

Also, please make sure that you're running debugpy.

[jakebrinkmann]

I am not using a launch.json, just the built in test runner. python.testing.pytestEnabled

@int19h I installed debugpy from vsix (your link) to no avail. No breakpoints or exceptions are being caught when I click debug, even though debug text is displayed in the debug console

[jakebrinkmann]

@int19h I created a launch file:

{
  // Use IntelliSense to learn about possible attributes.
  // Hover to view descriptions of existing attributes.
  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Python: Module",
      "type": "python",
      "request": "launch",
      "module": "pytest"
    }
  ]
}

My assert 1 < 0 was not caught:

# test_this.py
def test_():
    assert 1 < 0 

[int19h]

If you're running the code using "Debug Test" in the editor or in Test Explorer, the configuration needs to be "request": "test" to apply, and you don't need "module": "pytest" (it will take care of running the correct module etc).

It doesn't look like that's important here, though - I was just wondering if there's anything unusual in the config. Running without one should work.

Where is test_this.py located? The most common reason why breakpoints aren't being hit is because "justMyCode" setting is enabled in debug configuration (it's on by default), and the source file is in a location that debugger considers as Python stdlib - e.g. anywhere inside the folder where Python is installed, or inside a virtual environment.

[jakebrinkmann]

@int19h this seems to be the error, settings.json:

{
  "python.testing.pytestArgs": [
    "--cov", "./src",
    "--color=yes"
  ],
}

Those arguments together are causing the debugger to not raise breakpoints or catch exceptions.

[int19h]

Ohh, --cov is code coverage, isn't it? It's not compatible with debuggers in general. The usual approach is to have two different configurations, with and without coverage.