Update CI/tests to allow running proper, realistic unit tests

[andersy005]

This PR is one step towards a more robust CI system. I modified a few methods but kept the functionality the same. I intend to look into a refactor of the RemoteRunner so as to facilitate testing it in a separate PR.

• Create SSH Key for localhost
• Add tests
• Rewrite some methods to allow easy testing.
• Towards Support for more shells #135

[mnlevy1981]

The code you've included looks good, but I think we should modify .github/workflows/ci.yaml to test with sh and tcsh in addition to bash. I think, as written, we should get passes from sh but test_run_command will fail on tcsh. I'm okay with accepting this PR with a failing test in that case, I just want the test in place before we start refactoring to make it easier to support multiple shell options.

[andersy005]

I think we should modify .github/workflows/ci.yaml to test with sh and tcsh in addition to bash

I intend to address this within pytest unit tests instead of controlling this parametrization at the CI level. I avoided doing this in this PR since it would have required re-writing some parts of the code base and I wanted to make sure the SSH setup is working before breaking the tests...

[mnlevy1981]

Makes sense! Sorry if we talked about this earlier and I just misunderstood what the intended plan was :)

[andersy005]

No worries... You are right. During our last conversation, we had talked about parameterizing shells at the CI level. However, I think parametrizing this in the unit tests gives us more flexibility/control.

[andersy005]

Thank you for the feedback! I'm going to merge this and then I will open a separate PR that addresses #135