#!/usr/bin/python
#
# LBStoKG_test: tests the LBStoKG command
# 
# Test the LBStoKG command which, when run with an int > 0
# will print the corresponding kilogram conversion of the 
# weight specified in pounds.
#

import sys, imp, atexit
sys.path.append("/home/courses/cs3214/software/pexpect-dpty/");
import pexpect, shellio, signal, time, os, re, proc_check

#Ensure the shell process is terminated
def force_shell_termination(shell_process):
    c.close(force=True)

#pulling in the regular expression and other definitions
definitions_scriptname = sys.argv[1]
def_module = imp.load_source('', definitions_scriptname)
logfile = None
if hasattr(def_module, 'logfile'):
    logfile = def_module.logfile

# spawn an instance of the shell
c = pexpect.spawn(def_module.shell, drainpty=True, logfile=logfile, args=['-p', 'plugins/'])
atexit.register(force_shell_termination, shell_process=c)

# set timeout for all following 'expect*' calls to 5 seconds
c.timeout = 5

#test LBStoKG with a valid number
c.sendline("LBStoKG 100")
assert c.expect_exact("45.36 kg") == 0, "correct weight not printed by command"
c.sendline("LBStoKG 250")
assert c.expect_exact("113.40 kg") == 0, "correct weight not printed by command"

#test LBStoKG with invalid numbers
c.sendline("LBStoKG -10")
assert c.expect_exact("Error: invalid weight") == 0, "error case not handled."

c.sendline("LBStoKG")
assert c.expect_exact("Error: specify weight in pounds") == 0, "error case not handled"

# end the shell program by sending it an end-of-file character
c.sendline("exit");

# ensure that no extra characters are output after exiting
assert c.expect_exact("exit\r\n") == 0, "Shell output extraneous characters"

# the test was successful
shellio.success()