#!/bin/bash
#
# If you suspect that a spec becomes flaky on slow machines:
#
#     ./script/rspec-slow-repeat 10 spec/system/some_flaky_spec.rb
#
# You can use the resulting pass rate to asses if your code changes fixed it
# or not. In the end I would run a spec 100 times to be sure it's stable.

function finish() {
  echo "Exiting..."
  pkill -P $$
  if [ "$pass_rate" -lt 100 ]; then
    echo "Check tmp/rspec.log for details."
    exit 1
  else
    exit 0
  fi
}

trap finish SIGINT

if [ "$#" -lt 1 ]; then
  echo "Usage:   $0 <n> [rspec params]"
  echo "Example: $0 30 spec/system/admin/order_cycles/simple_spec.rb:202"
  exit 1
fi

n="$1"
passed=0

# Check via uname the environment we are running in to get the number of cores
if [[ "`uname`" == "Darwin" ]]; then
  processors="`sysctl -n hw.ncpu.`"
else
  processors="`cat /proc/cpuinfo | grep -c processor`"
fi

echo "Running $n times with $processors cores"

# The purpose here is to occupy the CPU (yes command is not multi-threaded and it occupies only one core)
# Start one process for each core, and then simulating a very busy CI environment with a 100% CPU load
# increasing the chance of race conditions when executing specs.
for i in `seq $processors`; do
  yes > /dev/null &
done

export RUBY_DEBUG_ENABLE=0
export SPRING_QUIET=true

for i in `seq "$n"`; do
  if ./bin/rspec "${@:2}" >> tmp/rspec.log; then
    echo "Pass."
    (( passed++ ))
  else
    echo "    !!! Fail !!!"
  fi
done

pass_rate="$(( passed * 100 / n))"
echo "$passed of $n passed ($pass_rate%)"

finish