class SubclassingFromList(unittest.TestCase):
def setUp(self):
self.polygon = Polygon()
def test_append(self):
self.assertTrue(len(self.polygon)==0)
self.assertRaises(TypeError, self.polygon.append, 1)
self.assertRaises(ValueError, self.polygon.append, (1, 2, 3))
self.polygon.append((1, 2))
self.assertTrue(len(self.polygon)==1)
self.assertTupleEqual(self.polygon[0], (1.0, 2.0))
self.assertTrue(all(isinstance(x, float) for x in reduce(concat, self.polygon)) )
def test_extend(self):
self.assertTrue(len(self.polygon)==0)
self.assertRaises(TypeError, self.polygon.extend, (1, 2))
self.assertRaises(ValueError, self.polygon.extend, [(1,2,3), (4,5,6)])
self.polygon.extend([(1, 2), (3, 4)])
self.assertTrue(len(self.polygon)==2)
self.assertTupleEqual(self.polygon[0], (1.0, 2.0))
self.assertTupleEqual(self.polygon[1], (3.0, 4.0))
self.assertTrue(all(isinstance(x, float) for x in reduce(concat, self.polygon)) )
def test_setitem(self):
self.polygon.append((0,0))
self.polygon[0] = (1, 2)
self.assertRaises(IndexError, setitem, self.polygon, 1, (1,2))
self.assertTupleEqual(self.polygon[0], (1.0, 2.0))
self.assertTrue(all(isinstance(x, float) for x in reduce(concat, self.polygon)) )
def test_setslice(self):
self.polygon[:] = [(1, 2), (3, 4)]
self.assertTrue(len(self.polygon)==2)
self.assertTupleEqual(self.polygon[0], (1.0, 2.0))
self.assertTupleEqual(self.polygon[1], (3.0, 4.0))
self.assertTrue(all(isinstance(x, float) for x in reduce(concat, self.polygon)) )
def test_insert(self):
self.polygon[:] = [(1, 2), (3, 4)]
self.polygon.insert(1, (5, 6))
self.assertTrue(len(self.polygon)==3)
self.assertTupleEqual(self.polygon[1], (5.0, 6.0))
self.assertTrue(all(isinstance(x, float) for x in reduce(concat, self.polygon)) )
class TestImplementation(unittest.TestCase):
def setUp(self):
self.polygon = Polygon()
def test_requires_at_least_three_vertices(self):
self.assertRaises(ValueError, getattr, self.polygon, "A")
self.assertRaises(ValueError, getattr, self.polygon, "_cog")
self.assertRaises(ValueError, getattr, self.polygon, "_I0")
self.polygon.append((0, 0))
self.assertRaises(ValueError, getattr, self.polygon, "A")
self.assertRaises(ValueError, getattr, self.polygon, "_cog")
self.assertRaises(ValueError, getattr, self.polygon, "_I0")
self.polygon.append((1, 0))
self.assertRaises(ValueError, getattr, self.polygon, "A")
self.assertRaises(ValueError, getattr, self.polygon, "_cog")
self.assertRaises(ValueError, getattr, self.polygon, "_I0")
self.polygon.append((0, 1))
try:
self.polygon.A
self.polygon._cog
self.polygon._I0
except:
self.fail("Not possible to calculate physical properties of polygon although it has three vertices")
def test_cached_properties_are_reset_on_change_of_vertices(self):
def error_raiser():
raise ValueError
self.polygon[:] = [(0, 0), (1, 0), (0, 1)]
self.polygon.reset_cached_properties = error_raiser
self.assertRaises(ValueError, self.polygon.append, (1,1))
self.assertRaises(ValueError, self.polygon.extend, [(1,1)])
self.assertRaises(ValueError, self.polygon.insert, 0, (1,1))
self.assertRaises(ValueError, setitem, self.polygon, 0, (1,1))
self.assertRaises(ValueError, setslice, self.polygon, 0, 1, [(1,1)])
def setUp(self):
self.polygon = Polygon()
