<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def trial(path=TESTS_PATH, coverage=False):
 """Run tests using trial """

    args = ['trial']
    if coverage:
        args.append('--coverage')
    args.append(path)
    print args
    local(' '.join(args))