WTF profiler and benchmarker in Rails 3.2

benchmarker.txt

% rails -v
Rails 3.2.5
% rails benchmarker -h
Usage: rails benchmarker 'Ruby.code' 'Ruby.more_code' ... [OPTS]
    -r, --runs N                     Number of runs.
                                     Default: 4
    -o, --output PATH                Directory to use when writing the results.
                                     Default: tmp/performance
    -m, --metrics a,b,c              Metrics to use.
                                     Default: wall_time,memory,objects,gc_runs,gc_time
% rails benchmarker 'sleep 1' ↓えっFile not found? rubyコード書くんじゃないの…
/Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:167:in `block in non_options': file not found: sleep 1 (ArgumentError)
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:146:in `map!'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:146:in `non_options'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:207:in `non_options'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:52:in `process_args'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/minitest/unit.rb:891:in `_run'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/minitest/unit.rb:884:in `run'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:21:in `run'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:326:in `block (2 levels) in autorun'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:27:in `run_once'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:325:in `block in autorun'

profiler.txt

% rails profiler -h          
Usage: rails benchmarker 'Ruby.code' 'Ruby.more_code' ... [OPTS] ←えっbenchmarker? profilerじゃないの…
    -r, --runs N                     Number of runs.
                                     Default: 1
    -o, --output PATH                Directory to use when writing the results.
                                     Default: tmp/performance
    -m, --metrics a,b,c              Metrics to use.
                                     Default: process_time,memory,objects
    -f, --formats x,y,z              Formats to output to.
                                     Default: flat,graph_html,call_tree,call_stack
% rails profiler 'sleep 1'
/Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:167:in `block in non_options': file not found: sleep 1 (ArgumentError)
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:146:in `map!'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:146:in `non_options'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:207:in `non_options'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:52:in `process_args'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/minitest/unit.rb:891:in `_run'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/minitest/unit.rb:884:in `run'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:21:in `run'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:326:in `block (2 levels) in autorun'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:27:in `run_once'
	from /Users/issei-naruta/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/test/unit.rb:325:in `block in autorun'

Did you figure out how to get around this?

No. I can't understand so far.

Really late to the party I know, but in case anyone else comes across this, you need to install test-unit gem, i.e. stick gem 'test-unit' in your Gemfile and run bundle install. Then it should work.

Yay Rails modularity.

The error message for this scenario is a complete fail.

Thanks, @latentflip. That would've driven me nuts for a long time.