dev-cmd/tests: Add profile option

[apainintheneck]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

---

This will allow us to more easily measure test performance. The only downside here is that we can't use it with parallel rspec because it will show the n slowest tests for each parallel rspec run which is not what we want.

Valid Profile Count

$ brew tests --only=utils/ --profile=5
Randomized with seed 41310
Run options: exclude {:needs_linux=>true, :needs_network=>true, :needs_ci=>true, :needs_svn=>true}

Randomized with seed 41310
............................................................................................................................................................................................................................................................................................................................................................

Top 5 slowest examples (6.4 seconds, 18.2% of total time):
  Utils::Svn::available? returns svn version if svn available
    1.86 seconds ./test/utils/svn_spec.rb:11
  Utils::Git#file_at_commit returns empty when file doesn't exist
    1.31 seconds ./test/utils/git_spec.rb:91
  Utils::Git#last_revision_commit_of_files when before_commit is not nil gives last revision commit
    1.13 seconds ./test/utils/git_spec.rb:107
  Utils::Git#cherry_pick! aborts when cherry picking an existing hash
    1.05 seconds ./test/utils/git_spec.rb:62
  Utils::Git::path returns path of git when git is available
    1.04 seconds ./test/utils/git_spec.rb:150

Top 5 slowest example groups:
  Utils::Git
    1.01 seconds average (22.2 seconds / 22 examples) ./test/utils/git_spec.rb:5
  Utils::Svn
    0.52233 seconds average (2.09 seconds / 4 examples) ./test/utils/svn_spec.rb:5
  Utils
    0.30937 seconds average (6.19 seconds / 20 examples) ./test/utils/git_repository_spec.rb:5
  Utils
    0.15552 seconds average (0.62206 seconds / 4 examples) ./test/utils/ruby_check_version_script_spec.rb:3
  Utils::Bottles
    0.10359 seconds average (0.10359 seconds / 1 example) ./test/utils/bottles/bottles_spec.rb:5

Finished in 35.2 seconds (files took 4.55 seconds to load)
348 examples, 0 failures

Randomized with seed 41310

Invalid Profile Count

In this case, it prints a warning and defaults to 10.

$ brew tests --only=utils/ --profile=sdklfjs
Randomized with seed 18207
WARNING: Non integer specified as profile count, separate your path from options with -- e.g. `rspec --profile -- sdklfjs`.
Run options: exclude {:needs_linux=>true, :needs_network=>true, :needs_ci=>true, :needs_svn=>true}

Randomized with seed 18207
............................................................................................................................................................................................................................................................................................................................................................

Top 10 slowest examples (10.36 seconds, 31.0% of total time):
  Utils::Git#cherry_pick! aborts when cherry picking an existing hash
    1.08 seconds ./test/utils/git_spec.rb:62
  Utils::Git::ensure_installed! when git is not already available raises error if can't install git
    1.05 seconds ./test/utils/git_spec.rb:181
  Utils::Git::remote_exists? when git is available returns false when git remote does not exist
    1.05 seconds ./test/utils/git_spec.rb:219
  Utils::Git#last_revision_of_file returns last revision of file
    1.05 seconds ./test/utils/git_spec.rb:118
  Utils::Git#file_at_commit returns empty when file doesn't exist
    1.05 seconds ./test/utils/git_spec.rb:91
  Utils::Git::path returns path of git when git is available
    1.04 seconds ./test/utils/git_spec.rb:150
  Utils::Git#last_revision_of_file returns last revision of file based on before_commit
    1.04 seconds ./test/utils/git_spec.rb:125
  Utils::Git::ensure_installed! returns nil if git already available
    1 seconds ./test/utils/git_spec.rb:167
  Utils::Git#last_revision_commit_of_files when before_commit is nil gives last revision commit
    1 seconds ./test/utils/git_spec.rb:99
  Utils::Git#cherry_pick! can cherry pick a commit
    0.99866 seconds ./test/utils/git_spec.rb:58

Top 10 slowest example groups:
  Utils::Git
    1 seconds average (22.05 seconds / 22 examples) ./test/utils/git_spec.rb:5
  Utils
    0.31344 seconds average (6.27 seconds / 20 examples) ./test/utils/git_repository_spec.rb:5
  Utils
    0.15897 seconds average (0.63588 seconds / 4 examples) ./test/utils/ruby_check_version_script_spec.rb:3
  Utils::Bottles
    0.10109 seconds average (0.10109 seconds / 1 example) ./test/utils/bottles/bottles_spec.rb:5
  Utils::Svn
    0.09407 seconds average (0.37628 seconds / 4 examples) ./test/utils/svn_spec.rb:5
  Utils::Bottles::Collector
    0.05015 seconds average (0.30092 seconds / 6 examples) ./test/utils/bottles/collector_spec.rb:5
  Utils
    0.03146 seconds average (0.06292 seconds / 2 examples) ./test/utils/fork_spec.rb:5
  Utils::Gzip
    0.0224 seconds average (0.112 seconds / 5 examples) ./test/utils/gzip_spec.rb:5
  Utils
    0.02039 seconds average (0.2243 seconds / 11 examples) ./test/utils/popen_spec.rb:5
  Utils::Tar
    0.01971 seconds average (0.09857 seconds / 5 examples) ./test/utils/tar_spec.rb:5

Finished in 33.45 seconds (files took 3.95 seconds to load)
348 examples, 0 failures

Randomized with seed 18207

[MikeMcQuaid]

Love this, thanks!