See this gist:

#!/usr/bin/python# -*- coding: utf-8 -*-# Inspired by https://gist.github.com/ddbeck/1421861# About: This coprocess produces an OSX notification with results of Mocha tests run via nodemon# # Installation: # 1. Make this script executable# 2. Register it: iTerm - Profiles - Open Profiles... - [Edit Profiles...] - <select your profile> -# - Advanced - Triggers - [Edit] - add a new trigger:# Regular Expression: [nodemon] starting `npm .*(run )?test.*`# Action: Run Coprocess# Parameters: /path/to/iterm-notify-test-failure.sh# 3. Troubleshooting tips:# * Verify the script can be run from the command line# * Instead waiting for Mocha to run, use e.g. `echo "npm test"` to trigger it# * Print into a file to produce debugging log or/and use e.g. the `say` osx command to track what is being processedimport subprocessimport sysimport re## Example input from a Mocha run:# 28 Apr 10:12:26 - [nodemon] starting `npm --silent run test:server`# ...# CacheItem fetching from a source# ✓ should return the in-progress-call promise if expired and requireNonExpired set# 1) should refresh its value even though valid when forceRefresh=true and return it# lookup# ✓ should return a promise### 2 passing (12ms)# 1 failing## 1) CacheItem fetching from a source should refresh its value even though valid when forceRefresh=true and return it:## AssertionError: expected 2 to deeply equal 23# + expected - actual# ...# 28 Apr 10:12:36 - [nodemon] clean exit - waiting for changes before restartdef incoming(): while True: yield raw_input()def notify(title_end = 'FAILED', msg = ''): subprocess.call([ 'osascript', "-e", ('display notification "%s" with title "Tests %s"' % (msg, title_end)) ])def main(): title_end = 'FAILED: ' msg = '' failingCountPattern = re.compile('.*(\d+) failing') # Failed test name example: ' [2K[0G [31m 1) Stack should do something [0m' # (the [2k etc. are Bash color escape/sequences, the ' ' is actually the control char \033) failedTestPattern = re.compile('(\033\\[\w+| \\W)+(\\d+\\) .*)\033\\[\w+') # TODO The end color seq. is not ignored for line in incoming(): failingCountMatch = failingCountPattern.match(line) failedTestMatch = failedTestPattern.match(line) if failingCountMatch: # ex: " 1 failing" title_end += failingCountMatch.group(1) if failedTestPattern.match(line): msg += failedTestMatch.group(2) + ': ' # Notifications display only one line so just the 1st error is displayed if 'AssertionError' in line: msg += line + '\n' if '[nodemon] app crashed' in line: notify(title_end = title_end, msg = msg) sys.exit(0) if '[nodemon] clean exit' in line: notify("OK"); sys.exit(0)if __name__ == '__main__': main()