73 lines
2.3 KiB
Python
73 lines
2.3 KiB
Python
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import math
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import unittest
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from circle import Circle
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class CircleTests(unittest.TestCase):
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"""Tests for Circle."""
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def test_radius(self):
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circle = Circle(5)
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self.assertEqual(circle.radius, 5)
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def test_default_radius(self):
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circle = Circle()
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self.assertEqual(circle.radius, 1)
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def test_diameter(self):
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circle = Circle(2)
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self.assertEqual(circle.diameter, 4)
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def test_area(self):
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circle = Circle(2)
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self.assertEqual(circle.area, math.pi * 4)
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circle = Circle(1)
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self.assertEqual(circle.area, math.pi)
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def test_string_representation(self):
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circle = Circle(2)
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self.assertEqual(str(circle), "Circle(2)")
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self.assertEqual(repr(circle), "Circle(2)")
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circle.radius = 1
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self.assertEqual(repr(circle), "Circle(1)")
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# To test the Bonus part of this exercise, comment out the following line
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# @unittest.expectedFailure
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def test_diameter_and_area_change_based_on_radius(self):
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circle = Circle(2)
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self.assertEqual(circle.diameter, 4)
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circle.radius = 3
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self.assertEqual(circle.diameter, 6)
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self.assertEqual(circle.area, math.pi * 9)
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# To test the Bonus part of this exercise, comment out the following line
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# @unittest.expectedFailure
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def test_diameter_changeable_but_area_not(self):
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circle = Circle(2)
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self.assertEqual(circle.diameter, 4)
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self.assertEqual(circle.area, math.pi * 4)
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circle.diameter = 3
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self.assertEqual(circle.radius, 1.5)
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with self.assertRaises(AttributeError):
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circle.area = 3
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# To test the Bonus part of this exercise, comment out the following line
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# @unittest.expectedFailure
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def test_no_negative_radius(self):
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with self.assertRaises(ValueError) as context:
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circle = Circle(-2)
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self.assertEqual(str(context.exception).lower(), "radius cannot be negative")
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circle = Circle(2)
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with self.assertRaises(ValueError) as context:
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circle.radius = -10
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self.assertEqual(str(context.exception).lower(), "radius cannot be negative")
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with self.assertRaises(ValueError):
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circle.diameter = -20
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self.assertEqual(circle.radius, 2)
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if __name__ == "__main__":
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unittest.main(verbosity=2)
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