示例#1
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	def test_tostring(self):
		self.assertEqual(str(linear_function(0, 0)), 'f(x) = 0')
		self.assertEqual(str(linear_function(1, 0)), 'f(x) = 1x')
		self.assertEqual(str(linear_function(-1, 0)), 'f(x) = -1x')
		self.assertEqual(str(linear_function(5, 0)), 'f(x) = 5x')
		self.assertEqual(str(linear_function(0, 5)), 'f(x) = 5')
		self.assertEqual(str(linear_function(5, 5)), 'f(x) = 5x + 5')
		self.assertEqual(str(linear_function(-5, -5)), 'f(x) = -5x - 5')
示例#2
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	def test_addition(self):
		function = linear_function(7, 9)
		self.assertEqual(function + function, function * 2)
示例#3
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	def test_composition(self):
		first_function = linear_function(2, 2)
		second_function = linear_function(5, 5)
		self.assertEqual(linear_function(10, 12), first_function(second_function))
示例#4
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	def test_substitution(self):
		function = linear_function(4, 5)
		self.assertEqual(function(0), function.b)
		self.assertEqual(function(1), function.k + function.b)