No code lenses shown for pytest

[xiaofeng0123]

Visual Studio Code - Insiders: 1.36.0-insider
python-insider: 2019.6.21464-rc

Repro steps:

1. Input below code:

def test_passing():
    assert 42 == 42
def test_failure():
    assert 42 == -13

2. Run tests with pytest framework
3. Run all tests

Actual Result:
No code lenses shown after run all tests

Expect Result:
It should display code lenses

[brettcannon]

I can verify.

[luabud]

CodeLenses are not showing for me with 2019.7.21668-dev. Works fine with 2019.5.18875

VS Code 1.35.1

[yozlet]

I see pytest code lenses on 2019.7.21619-dev, so must have been a very recent breakage.

[DonJayamanne]

I see pytest code lenses on 2019.7.21619-dev, so must have been a very recent breakage.

It works for me too (always).
Hence classifying this as a flaky issue, however one that needs to be looked at (hence the P1), as a majority of the extension devs can replicate this issue.

[korn-1c-ru]

Same issue here (no codelens visible). How can I help to investigate it?
It reproduces on 1.34 and 1.35.
Test explorer works well, test discovery works.
"editor.codeLens": true
python 3.7.3 32-bit.
pytest 4.3.1 or 4.6.4 or 5.0.0 (codelens doesn't work with all of them).
OS is Windows 10 Pro 64-bit.

Additionally I have setup.py:

[aliases]
test = pytest

[tool:pytest]
addopts =
    --cov=./tests
    --cov-report=xml
    --cov-report=html:coverage

and next option ignored now (but worked some days ago) and debug doesn't work (due to coverage enabled), deleting setup.py allowing to debug but it's not a solution:

{
    "python.testing.pytestArgs": [
        "--no-cov"
    ]
}

I've switched to Nose and codelens appeared. Codelens disappeared when I switched back to PyTest.

[korn-1c-ru]

I've resolved this issue (codelens is visible now) by renaming first letter of the first dir in the workspace path to lowercase. It was sole uppercase letter in the path. But it was uppercase all its lifetime and I had no problems with codelens and debug. Don't forget to remove cache folders (.pytest_cache, __pycache__).

Is it relevant to microsoft/vscode#12448?

[brettcannon]

@korn-1c-ru thanks for the diagnosis!

[ericsnowcurrently]

FWIW, the adapter effectively [1] returns whatever pytest gives it. We have no guarantees about casing or even that the returned root and test source will be in the workspace. So we should always match carefully, as much as possible. What pytest provides will almost always be okay, but the mitigation is worth doing anyway (not big nor complicated).

[1] Currently we normcase but the situation remains either way.

[brettcannon]

CTI said they ran into this again.

[karrtikr]

Well I'm unable to reproduce this. Maybe they have some extension like liveshare installed, which is known to cause problems with codelenses.