示例#1
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    def test_SubstrWWithZeroLength(self):
        subString = substr("abcdef", 3, 0)

        self.assertFalse(subString)
示例#2
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    def test_SubstrWithNegativeLength(self):
        subString = substr("abcdef", 2, -1)

        self.assertEqual(subString, 'cde')
示例#3
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    def test_SubstrWithANumberTooNegative(self):
        subString = substr("abcdef", 4, -4)

        self.assertFalse(subString)
示例#4
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    def test_SubstrWithNULLInput(self):
        subString = substr(None, -1)

        self.assertFalse(subString)
示例#5
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    def test_SubstrWithPositiveLength(self):
        subString = substr("abcdef", 3, 1)

        self.assertEqual(subString, 'd')
示例#6
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    def test_SubstrWithNegativeStartIndex(self):
        subString = substr("hello", -1)

        self.assertEqual(subString, "o")
示例#7
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    def test_SubstrLenthLessThanNegativeStartIndex(self):
        subString = substr("one", -4)

        self.assertFalse(subString)
示例#8
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	def test_SubstrWWithZeroLength(self):
		subString = substr("abcdef", 3, 0)

		self.assertFalse(subString)
示例#9
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    def test_SubstrWithPositiveStartIndex(self):
        subString = substr("hello", 2)

        self.assertEqual(subString, "llo")
示例#10
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	def test_SubstrWithNegativeLength(self):
		subString = substr("abcdef", 2, -1)

		self.assertEqual(subString, 'cde')
示例#11
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	def test_SubstrWithANumberTooNegative(self):
		subString = substr("abcdef", 4, -4)

		self.assertFalse(subString)
示例#12
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	def test_SubstrWithPositiveLength(self):
		subString = substr("abcdef", 3, 1)

		self.assertEqual(subString, 'd')
示例#13
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	def test_SubstrWithNULLInput(self):
		subString = substr(None, -1)

		self.assertFalse(subString)
示例#14
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	def test_SubstrLenthLessThanNegativeStartIndex(self):
		subString = substr("one", -4)

		self.assertFalse(subString)
示例#15
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	def test_SubstrWithNegativeStartIndex(self):
		subString = substr("hello", -1)

		self.assertEqual(subString, "o")
示例#16
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	def test_SubstrWithPositiveStartIndex(self):
		subString = substr("hello", 2)

		self.assertEqual(subString, "llo")