How I run MiniTest tests in 50% of the time of Rake::TestTask

README.md

RESULTS

Rake::TestTask

time rake test
real	0m1.111s
user	0m0.962s
sys	0m0.133s

time rake test
real	0m1.074s
user	0m0.944s
sys	0m0.124s

My bash script

time bin/test
real	0m0.504s
user	0m0.437s
sys	0m0.066s

time bin/test
real	0m0.495s
user	0m0.431s
sys	0m0.066s

Run one test by running bin/test.sh test/user_test.rb.

Or run the test for a file in lib bin/test.sh lib/user.rb will run the tests in user_test.rb.

Lastly, run all tests in the tests directory by running bin/test.sh.

Better yet, map this in vim.

map <Leader>tt :!bin/test.sh %<CR> " run test or test for file
map <Leader>ta :!bin/test.sh<CR>   " run all tests

Rakefile

require 'rake/testtask'

Rake::TestTask.new do |t|
  t.libs << "test"
  t.test_files = FileList['test/**/*_test.rb']
end

test.sh

#!/bin/bash

set -e

FILENAME="$1"
if [ ! $FILENAME == "" ]; then
  if [[ -d $FILENAME ]]; then
    TESTS=''
    for file in `find $FILENAME | grep _test.rb`; do
      TESTS="$TESTS require '`pwd`/$file';"
    done

    LIBDIR=${FILENAME/test*/lib}

    ruby -I$LIBDIR:$FILENAME -e "$TESTS"
  else
    if [[ ! $FILENAME == *_test.rb ]]; then
      FILENAME=${FILENAME/lib/test}
      FILENAME=${FILENAME/.rb/_test.rb}
    fi
    if [ -f $FILENAME ]; then
      ruby -Ilib:test $FILENAME
    else
      echo "File does not exist"
    fi
  fi
else
  TESTS=''
  for file in `find test | grep _test.rb`; do
    TESTS="$TESTS require '`pwd`/$file';"
  done

  ruby -Ilib:test -e "$TESTS"
fi

Also: how big is your test suite?

Also: why aren't you just using find instead of find+grep? find test -name \*_test.rb might be even quicker.