#!/usr/bin/python
#
# C_to_F_test: Tests the Celsius to Fahrenheit unit converter
# 
# Tests the Celsius to Fahrenheit unit converter, which will take in
# a float in Celsius and convert it to Fahrenheit. 
#

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

# Tests temperatures with a valid numbers
c.sendline("C_to_F 0")
assert c.expect_exact("Celsius: 0.00 Fahrenheit: 32.00") == 0, "Incorrect conversion of temperature"
c.sendline("C_to_F 100")
assert c.expect_exact("Celsius: 100.00 Fahrenheit: 212.00") == 0, "Incorrect conversion of temperature"
c.sendline("C_to_F 19.5")
assert c.expect_exact("Celsius: 19.50 Fahrenheit: 67.10") == 0, "Incorrect conversion of temperature"

# Tests temperatures with invalid numbers
c.sendline("C_to_F abc")
assert c.expect_exact("Error: Invalid temperature, please enter a number") == 0, "error case not handled."

c.sendline("C_to_F")
assert c.expect_exact("Error: Specify temperature") == 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()