add minitest framework

[johrstrom]

add minitest framework to begin refactoring from rspec.

Fixes #845

[johrstrom]

This replaces this line from rspec. Minitest doesn't have the same facility, but I've added some helper methods to do the same.

ood_core/spec/job/adapters/slurm_spec.rb

Line 11 in 65f8ac5

it { is_expected.to respond_to(:submit).with(1).argument.and_keywords(:after, :afterok, :afternotok, :afterany) }

[johrstrom]

This test replaces this rspec test below, and just reinforces my issue with rspec. Here in mintest we see what I have to stub Open3 because at some point calling submit on an adapter will result in an Open3.capture3 call.

I guess I just like the explicit nature of Minitest. How is rspec stubbing Open3? I guess it doesn't need to? Like somehow calling submit will stop execution once slurm.submit_string is called? There's just a bit too much magic happening, to the point where I'm not really even sure what code is being executed during this test.

ood_core/spec/job/adapters/slurm_spec.rb

Lines 72 to 77 in 65f8ac5

	context "with :submit_as_hold" do
	context "as true" do
	before { adapter.submit(build_script(submit_as_hold: true)) }
	it { expect(slurm).to have_received(:submit_string).with(content, args: ["-H", "--export", "NONE"], env: {}) }
	end

[Oglopf]

Awesome to see this. I much prefer minitest tests, both reading and writing them.