Wrong errors raised in tests? about talisker HOT 4 OPEN

Hi Michael, thanks for the bug report!

It looks like you are running the tests on Mac OS X? The kernel error numbers/names generated for these errors are different between Linux and OS X, but the tests check only the Linux numbers/names.

We can't easily run the tests on Mac OS X, but would welcome patches to fix the tests.

Also the tests fail, but the code they are testing actually works as intended, which is good :)

Edit: does docker on Mac OS X using a Linux kernel, or run on Darwin directly? If the former, what kernel version is it? It's possible this could be a Linux change that need accounting for in the tests

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It may possible to use the errno module in the stdlib to write these tests in a more cross platform manner

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My bad, forgot to go inside container. Yes, it is MacOsX.

https://docs.docker.com/v17.09/docker-for-mac/docker-toolbox/#the-docker-for-mac-environment

Docker for Mac does not use VirtualBox, but rather HyperKit, a lightweight macOS virtualization solution built on top of Hypervisor.framework in macOS 10.10 Yosemite and higher.

Then goes tiny linux kernel that supports docker and then everything else as I understood.
Docker info:
...
Kernel Version: 4.9.125-linuxkit
Operating System: Docker for Mac
OSType: linux
Architecture: x86_64
...

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#454
Just a workaround if and until you really need the system-specific error codes.

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