sagemathgh-40474: Add pytest command to run tests in CI workflow
    
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Alternative to sagemath#40446. This time
running pytest directly in the CI, instead of as part of `sage -t`.

Removed one old test file that fails with meson since the sage cli is
different then.

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### ⌛ Dependencies

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URL: sagemath#40474
Reported by: Tobias Diez
Reviewer(s):

Author: Release Manager

.github/workflows/ci-meson.yml

@@ -167,6 +167,7 @@ jobs:
             # Ignore errors on Windows, for now
             pytest --doctest-ignore-import-errors --doctest -rfEs -s src || true
           else
+            pytest -rfEs -s src
             ./sage -t ${{ matrix.tests == 'all' && '--all' || '--new --long' }} -p4 --format github
           fi
 

conftest.py

@@ -198,10 +198,6 @@ def pytest_collect_file(
                 # This is an executable file.
                 return IgnoreCollector.from_parent(parent)
 
-            if file_path.name == "conftest_inputtest.py":
-                # This is an input file for testing the doctest machinery (and contains broken doctests).
-                return IgnoreCollector.from_parent(parent)
-
             if (
                 (
                     file_path.name == "finite_dimensional_lie_algebras_with_basis.py"

src/conftest_inputtest.py

@@ -34,6 +34,6 @@ def test_invalid_notebook_choice():
 
 
 def test_help():
-    parser = argparse.ArgumentParser()
+    parser = argparse.ArgumentParser(prog="sage")
     JupyterNotebookCmd.extend_parser(parser)
-    assert parser.format_usage() == "usage: pytest [-h] [-n [{jupyter,jupyterlab}]]\n"
+    assert parser.format_usage() == "usage: sage [-h] [-n [{jupyter,jupyterlab}]]\n"