def test_get_moment(self):
chunk = Chunk()
self.assertEquals(chunk.get_moment(), 0.0, "bad initial moment")
shard1 = Disc(gold, 2, (10, 20))
shard2 = Block(gold, self.unitsquare, (100, 200))
chunk.shards = [shard1, shard2]
expected = shard1.get_moment() + shard2.get_moment()
self.assertEquals(chunk.get_moment(), expected, "bad moment")
def test_get_moment(self):
radius = 5
offset = (1, 2)
disc = Disc(gold, radius, offset)
expected = moment_for_circle(disc.mass, 0, radius, offset)
self.assertEquals(disc.get_moment(), expected, "bad moment")
