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unit-Expression.py
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unit-Expression.py
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import unittest
import sys
import os.path
sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
from Expression import Expression, Context
class TestContext(unittest.TestCase):
"""
Unit tests for the Context class
"""
def setUp(self):
self.c = Context()
self.c['FAIL'] = 'PASS'
def test_string_literal(self):
"""test string literal, fall-through for undefined var in a Context"""
self.assertEqual(self.c['PASS'], 'PASS')
def test_variable(self):
"""test value for defined var in the Context class"""
self.assertEqual(self.c['FAIL'], 'PASS')
def test_in(self):
"""test 'var in context' to not fall for fallback"""
self.assert_('FAIL' in self.c)
self.assert_('PASS' not in self.c)
class TestExpression(unittest.TestCase):
"""
Unit tests for the Expression class
evaluate() is called with a context {FAIL: 'PASS'}
"""
def setUp(self):
self.c = Context()
self.c['FAIL'] = 'PASS'
def test_string_literal(self):
"""Test for a string literal in an Expression"""
self.assertEqual(Expression('PASS').evaluate(self.c), 'PASS')
def test_variable(self):
"""Test for variable value in an Expression"""
self.assertEqual(Expression('FAIL').evaluate(self.c), 'PASS')
def test_not(self):
"""Test for the ! operator"""
self.assert_(Expression('!0').evaluate(self.c))
self.assert_(not Expression('!1').evaluate(self.c))
def test_equals(self):
""" Test for the == operator"""
self.assert_(Expression('FAIL == PASS').evaluate(self.c))
def test_notequals(self):
""" Test for the != operator"""
self.assert_(Expression('FAIL != 1').evaluate(self.c))
if __name__ == '__main__':
unittest.main()