class ReversePolishNotationConverterTests(unittest.TestCase):
def test_EmptyExpressionResultsInSame(self):
self.when("")
self.then("")
def test_NoneProducesEmptyResult(self):
self.when(None)
self.then("")
def test_OneNumberResultInSameNumber(self):
self.when("2")
self.then("2")
def test_HandlesASingleBinaryOperator(self):
self.when("1+2")
self.then("1 2 +")
def test_HandlesMultipleOperatorsOfSamePrecedence(self):
self.when("2-5+3")
self.then("2 5 - 3 +")
def test_HandlesMultipleOperatorsOfDifferentPrecedence_Multiply(self):
self.when("2-5*3")
self.then("2 5 3 * -")
def test_HandlesMultipleOperatorsOfDifferentPrecedence_Division(self):
self.when("2-5/3")
self.then("2 5 3 / -")
def test_HandlesMultipleOperatorsOfDifferentPrecedence_All_Four(self):
self.when("2+5/3-2*8")
self.then("2 5 3 / + 2 8 * -")
def test_RemovesUnneccessaryParameters(self):
self.when("(2*3)+4")
self.then("2 3 * 4 +")
def test_NecessaryParenthesesChangeOrderOfEveluation(self):
self.when("(3+5)/9")
self.then("3 5 + 9 /")
def test_NecessaryParenthesesChangeOrderOfEveluation_AllFourOperators(
self):
self.when("(3-5)*(7+8)/9")
self.then("3 5 - 7 8 + * 9 /")
def setUp(self):
self.converter = ReversePolishNotationConverter()
def when(self, expression):
self.result = self.converter.transform(expression)
def then(self, expected):
self.assertEqual(self.result, expected)
class ReversePolishNotationConverterTests(unittest.TestCase):
def test_EmptyExpressionResultsInSame(self):
self.when("")
self.then("")
def test_NoneProducesEmptyResult(self):
self.when(None)
self.then("")
def test_OneNumberResultInSameNumber(self):
self.when("2")
self.then("2")
def test_HandlesASingleBinaryOperator(self):
self.when("1+2")
self.then("1 2 +")
def test_HandlesMultipleOperatorsOfSamePrecedence(self):
self.when("2-5+3")
self.then("2 5 - 3 +")
def test_HandlesMultipleOperatorsOfDifferentPrecedence_Multiply(self):
self.when("2-5*3")
self.then("2 5 3 * -")
def test_HandlesMultipleOperatorsOfDifferentPrecedence_Division(self):
self.when("2-5/3")
self.then("2 5 3 / -")
def test_HandlesMultipleOperatorsOfDifferentPrecedence_All_Four(self):
self.when("2+5/3-2*8")
self.then("2 5 3 / + 2 8 * -")
def test_RemovesUnneccessaryParameters(self):
self.when("(2*3)+4")
self.then("2 3 * 4 +")
def test_NecessaryParenthesesChangeOrderOfEveluation(self):
self.when("(3+5)/9")
self.then("3 5 + 9 /")
def test_NecessaryParenthesesChangeOrderOfEveluation_AllFourOperators(self):
self.when("(3-5)*(7+8)/9")
self.then("3 5 - 7 8 + * 9 /")
def setUp(self):
self.converter = ReversePolishNotationConverter()
def when(self, expression):
self.result = self.converter.transform(expression)
def then(self, expected):
self.assertEqual(self.result, expected)
def setUp(self):
self.converter = ReversePolishNotationConverter()
def setUp(self):
self.converter = ReversePolishNotationConverter()
