def test_clear(self):
#Test clear on front only
tdb = Structs.DoubleBuffer()
tdb._write_front_buffer(3)
tdb._write_front_buffer(4)
tdb._write_back_buffer(100)
tdb._write_back_buffer(200)
tdb.clear(front=True, back=False)
expected_front = []
actual_front = tdb.get_front_buffer_items()
self.assertListEqual(expected_front, actual_front)
expected_back = [100, 200]
actual_back = tdb.get_back_buffer_items()
self.assertListEqual(expected_back, actual_back)
#Test clear on back only
tdb = Structs.DoubleBuffer()
tdb._write_front_buffer(3)
tdb._write_front_buffer(4)
tdb._write_back_buffer(100)
tdb._write_back_buffer(200)
tdb.clear(front=False, back=True)
expected_front = [3, 4]
actual_front = tdb.get_front_buffer_items()
self.assertListEqual(expected_front, actual_front)
expected_back = []
actual_back = tdb.get_back_buffer_items()
self.assertListEqual(expected_back, actual_back)
#Test clear on both
tdb = Structs.DoubleBuffer()
tdb._write_front_buffer(3)
tdb._write_front_buffer(4)
tdb._write_back_buffer(100)
tdb._write_back_buffer(200)
tdb.clear(front=True, back=True)
expected_front = []
actual_front = tdb.get_front_buffer_items()
self.assertListEqual(expected_front, actual_front)
expected_back = []
actual_back = tdb.get_back_buffer_items()
self.assertListEqual(expected_back, actual_back)
#Test clear on neither
tdb = Structs.DoubleBuffer()
tdb._write_front_buffer(3)
tdb._write_front_buffer(4)
tdb._write_back_buffer(100)
tdb._write_back_buffer(200)
tdb.clear(front=False, back=False)
expected_front = [3, 4]
actual_front = tdb.get_front_buffer_items()
self.assertListEqual(expected_front, actual_front)
expected_back = [100, 200]
actual_back = tdb.get_back_buffer_items()
self.assertListEqual(expected_back, actual_back)
def test_push(self):
#Test wrong type push
tdb = Structs.DoubleBuffer()
#Test proper push
tdb.push(3)
tbd_fb = tdb.get_front_buffer_items()
tbd_bb = tdb.get_back_buffer_items()
expected_fb = 0
expected_bb = 1
actual_fb = len(tbd_fb)
actual_bb = len(tbd_bb)
self.assertTrue(expected_fb == actual_fb)
self.assertTrue(expected_bb == actual_bb)
def test_flip_exact(self):
tdb = Structs.DoubleBuffer()
tdb.push(3)
tdb.push(4)
tdb.flip(mode='exact')
tdb.push(100)
tdb.push(200)
tdb.flip(mode='exact')
expected_front = [100, 200]
actual_front = tdb.get_front_buffer_items()
self.assertListEqual(expected_front, actual_front)
expected_back = [3, 4]
actual_back = tdb.get_back_buffer_items()
self.assertListEqual(expected_back, actual_back)
def test_pop(self):
#Test that pop from empty list raises IndexError
tdb = Structs.DoubleBuffer()
with self.assertRaises(IndexError):
tdb.pop()
#Test that pop after push STILL raises IndexError since push is to bbuf
tdb = Structs.DoubleBuffer()
tdb.push(3)
with self.assertRaises(IndexError):
tdb.pop()
#Test that pop after push AND flip correctly gets the value back
#Push an value after the flip to make sure that value doesn't get returned
#(should be in back buffer)
tdb = Structs.DoubleBuffer()
tdb.push("Yellow")
tdb.flip(mode='exact')
tdb.push("Red")
expected = "Yellow"
actual = tdb.pop()
self.assertTrue(expected == actual)
with self.assertRaises(IndexError):
tdb.pop()
def test_flip_transfer_front(self):
tdb = Structs.DoubleBuffer()
tdb.push(3)
tdb.push(4)
tdb.flip(mode='exact') #This flip is simply so that we can put stuff
#In both buffers
tdb.push(100)
tdb.push(200)
tdb.flip(mode='transfer_front') #This is the flip we're testing
expected_front = [100, 200, 3, 4]
actual_front = tdb.get_front_buffer_items()
self.assertListEqual(expected_front, actual_front)
expected_back = []
actual_back = tdb.get_back_buffer_items()
self.assertListEqual(expected_back, actual_back)
