def test_SubstrWWithZeroLength(self):
subString = substr("abcdef", 3, 0)
self.assertFalse(subString)
def test_SubstrWithNegativeLength(self):
subString = substr("abcdef", 2, -1)
self.assertEqual(subString, 'cde')
def test_SubstrWithANumberTooNegative(self):
subString = substr("abcdef", 4, -4)
self.assertFalse(subString)
def test_SubstrWithNULLInput(self):
subString = substr(None, -1)
self.assertFalse(subString)
def test_SubstrWithPositiveLength(self):
subString = substr("abcdef", 3, 1)
self.assertEqual(subString, 'd')
def test_SubstrWithNegativeStartIndex(self):
subString = substr("hello", -1)
self.assertEqual(subString, "o")
def test_SubstrLenthLessThanNegativeStartIndex(self):
subString = substr("one", -4)
self.assertFalse(subString)
def test_SubstrWWithZeroLength(self):
subString = substr("abcdef", 3, 0)
self.assertFalse(subString)
def test_SubstrWithPositiveStartIndex(self):
subString = substr("hello", 2)
self.assertEqual(subString, "llo")
def test_SubstrWithNegativeLength(self):
subString = substr("abcdef", 2, -1)
self.assertEqual(subString, 'cde')
def test_SubstrWithANumberTooNegative(self):
subString = substr("abcdef", 4, -4)
self.assertFalse(subString)
def test_SubstrWithPositiveLength(self):
subString = substr("abcdef", 3, 1)
self.assertEqual(subString, 'd')
def test_SubstrWithNULLInput(self): subString = substr(None, -1) self.assertFalse(subString)
def test_SubstrLenthLessThanNegativeStartIndex(self):
subString = substr("one", -4)
self.assertFalse(subString)
def test_SubstrWithNegativeStartIndex(self):
subString = substr("hello", -1)
self.assertEqual(subString, "o")
def test_SubstrWithPositiveStartIndex(self):
subString = substr("hello", 2)
self.assertEqual(subString, "llo")