Choose other test framework when ruby-lsp-rails not present

[tristil]

Motivation

ruby-lsp chooses 'rails' framework when rails is present in the gem dependencies list, so that ruby-lsp-rails can add its own testing commands. But this can be confusing if somebody installs ruby-lsp without also installing ruby-lsp-rails on a rails project, because the test commands will not show up at all. Ideally a dialogue in the relevant extension would prompt the user to install ruby-lsp-rails, but ruby-lsp should select the available testing framework.

Implementation

If ruby-lsp-rails is not present look for minitest or test-unit instead.

Automated Tests

I updated the tests to handle the new case. There is one failing test that was preexisting.

Manual Tests

I tested this inside Vscode

[tristil]

I have signed the CLA!

[andyw8]

Hi @tristil,

Am I correct in thinking that your Rails app uses "minitest style" tests?, e.g.:

def test_foo_is_true
  # ...
end

rather than ActiveSupport declarative tests, e.g.:

test "foo is true" do
 # ...
end

[tristil]

@andyw8 For the most part, yes

[andyw8]

This should shortly be made unnecessary by #1381.