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Python tests can now be debugged by running them as embedded tests within NUnit#1341

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lostmsu merged 4 commits intopythonnet:masterfromtminka:TestPythonTest
Jan 5, 2021

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tminka
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What does this implement/fix? Explain your changes.

When debugging a problem such as issue#1325, it is immensely useful to have the Visual Studio debugger stop at the location of the error. This is tricky to do with pytest, even when running pytest from Visual Studio. Running the test via Python.Exec makes debugging simple and easy. You don't need to re-install Python.NET every time you make a change. You don't need to edit project options, and you don't need to figure out how to run pytest from Visual Studio.

With this change, you can just type in the name of the python test you want to debug, build the solution, and debug the new NUnit test that appears.

Does this close any currently open issues?

No

Any other comments?

No

Checklist

Check all those that are applicable and complete.

  • Make sure to include one or more tests for your change
  • If an enhancement PR, please create docs and at best an example
  • Add yourself toAUTHORS
  • Updated theCHANGELOG

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@lostmsu
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These must not be run during CI. As I suggested, this should be a separate project file.

@tminka
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tminka commentedDec 31, 2020•
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Why can't they run during CI? They do test the embedding system. Also, it is important that this setup is not broken by some other change.

@lostmsu
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That makes sense. But still I would put them into a separate project file.

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It appears thatPy.Import("pytest") is failing on some platforms, for reasons unrelated to this PR. Any ideas?

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@tminka I think the cause might be that the OS image running actions in CI has Python 3.8 installed as system Python, and when embed tests are running, it is being picked up instead of the one in custom environment.

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Sorry, just noticed the issue with skippedShutdown

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@lostmsu I don't think it is picking up the wrong Python installation because anearlier commit showed the value of sys.path in the embedded tests:

Python.Runtime.PythonException : ImportError : No module named pytest when sys.path=/opt/hostedtoolcache/Python/3.8.6/x64/lib/python38.zip:/opt/hostedtoolcache/Python/3.8.6/x64/lib/python3.8:/opt/hostedtoolcache/Python/3.8.6/x64/lib/python3.8/lib-dynload:/opt/hostedtoolcache/Python/3.8.6/x64/lib/python3.8/site-packages:/usr/share/dotnet/shared/Microsoft.NETCore.App/3.1.10/:/home/runner/work/pythonnet/pythonnet/src:/home/runner/work/pythonnet/pythonnet/src/tests/fixtures:/home/runner/work/pythonnet/pythonnet/src:/home/runner/work/pythonnet/pythonnet/src/tests/fixtures

The "Install dependencies" step installed pytest into/opt/hostedtoolcache/Python/3.8.6/x64/lib/python3.8/site-packages which is on that path.

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@tminka since you moved python test running from .NET to a separate project and CI step, you no longer need the changes toTestPythonEngineProperties.cs for the purposes this PR is trying to achieve. Moving it to a separate PR should let us merge the runner.

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I agree, but I think the change to importhook is important enough (and harmless enough) to keep in this PR.

@@ -342,7 +345,7 @@ public static IntPtr __import__(IntPtr self, IntPtr args, IntPtr kw)
ManagedType mt = tail.GetAttribute(name, true);
if (!(mt is ModuleObject))
{
Exceptions.SetError(Exceptions.ImportError,$"No module named {name}");
Exceptions.SetError(Exceptions.ImportError,originalExceptionMessage);
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UsePythonException.Restore()

@lostmsulostmsu merged commit96cc739 intopythonnet:masterJan 5, 2021
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