class CursorMovementTests(unittest.TestCase):
def setUp(self):
self.gapbuffer = GapBuffer()
def test_cursor_position_with_new_buffer_is_zero(self):
self.assertEqual(0, self.gapbuffer.get_cursor_position())
def test_cursor_cant_be_moved_forward_with_empty_buffer(self):
self.assertFalse(self.gapbuffer.cursor_can_move_forward())
def test_cursor_cant_be_moved_backward_with_empty_buffer(self):
self.assertFalse(self.gapbuffer.cursor_can_move_backward())
def test_cursor_cant_be_moved_forward_once_with_emtpy_buffer(self):
self.assertRaises(CursorOutOfBoundsException,
self.gapbuffer.move_cursor_forward)
self.assertRaises(CursorOutOfBoundsException,
self.gapbuffer.move_cursor_forward, 1)
def test_cursor_cant_be_moved_forward_an_arbitrary_amount_with_empty_buffer(
self):
#3 and 5 are arbitrary constants here
self.assertRaises(CursorOutOfBoundsException,
self.gapbuffer.move_cursor_forward, 3)
self.assertRaises(CursorOutOfBoundsException,
self.gapbuffer.move_cursor_forward, 5)
def test_cursor_cant_be_moved_backward_once_with_empty_buffer(self):
self.assertRaises(CursorOutOfBoundsException,
self.gapbuffer.move_cursor_backward)
self.assertRaises(CursorOutOfBoundsException,
self.gapbuffer.move_cursor_backward, 1)
def test_cursor_cant_be_moved_backward_an_arbitrary_amount_with_empty_buffer(
self):
self.assertRaises(CursorOutOfBoundsException,
self.gapbuffer.move_cursor_backward, 3)
self.assertRaises(CursorOutOfBoundsException,
self.gapbuffer.move_cursor_backward, 5)
def test_cursor_can_be_moved_backwards_after_insert(self):
self.gapbuffer.insert('a')
self.assertTrue(self.gapbuffer.cursor_can_move_backward())
def test_moving_cursor_backwards_after_insert(self):
self.gapbuffer.insert('a')
self.assertEqual(1, self.gapbuffer.get_cursor_position())
self.gapbuffer.move_cursor_backward()
self.assertEqual(0, self.gapbuffer.get_cursor_position())
def test_moving_cursor_backwards_more_than_one_position_after_insert(self):
self.gapbuffer.insert("abc")
self.assertEqual(3, self.gapbuffer.get_cursor_position())
self.gapbuffer.move_cursor_backward(2)
self.assertEqual(1, self.gapbuffer.get_cursor_position())
self.gapbuffer.move_cursor_backward(1)
self.assertEqual(0, self.gapbuffer.get_cursor_position())
def test_cursor_cant_be_moved_forward_after_only_inserts(self):
self.gapbuffer = GapBuffer(4)
self.gapbuffer.insert('a')
self.assertFalse(self.gapbuffer.cursor_can_move_forward())
def test_cursor_cant_be_moved_forward_after_only_inserts_in_incorrectly_sized_buffer(
self):
self.gapbuffer = GapBuffer(2)
self.gapbuffer.insert("abc")
self.assertFalse(self.gapbuffer.cursor_can_move_forward())
def test_moving_cursor_forward_once_after_insert_and_moving_backward(self):
self.gapbuffer.insert('a')
self.gapbuffer.move_cursor_backward()
self.gapbuffer.move_cursor_forward()
self.assertEqual(1, self.gapbuffer.get_cursor_position())
def test_moving_cursor_forwards_more_than_one_position_after_inserts_and_moving_backwards(
self):
self.gapbuffer.insert("abc")
self.gapbuffer.move_cursor_backward(3)
self.gapbuffer.move_cursor_forward(2)
self.assertEqual(2, self.gapbuffer.get_cursor_position())
