run_test - a shell script function that allows you to quickly run rails tests.

.zshrc

# Allows you to run a rails test from the CLI with:
#
#   run_test "when x happens then abcd should happen"
#
# Which turns it into: 
#   rails test --name "/^test_when_x_happens_then_abcd_should_happen$/"
#
run_test() {
  # Check if a test description was provided
  if [ -z "$1" ]; then
    echo "Usage: run_test \"test description\""
    return 1
  fi

  # Convert spaces to underscores
  local transformed=$(echo "$1" | sed 's/ /_/g')

  # Build the regex. Adjust the prefix if necessary.
  local regex="^test_${transformed}\$"

  # Run the rails test command
  rails test --name "/${regex}/"
}