def test_read_northwest_out_of_bounds(self):
cursor = Cursor([['A']])
cursor._position = (0, 0)
self.assertIsNone(cursor.read(-1, -1))
def test_read_northwest_value(self):
cursor = Cursor([['A']])
cursor._position = (1, 1)
self.assertEqual(cursor.read(-1, -1), 'A')
def test_read_out_of_range(self):
cursor = Cursor([[]])
self.assertIsNone(cursor.read())
def test_read_value(self):
cursor = Cursor([[1]])
self.assertEqual(cursor.read(), 1)
def test_read_value_x_y(self):
cursor = Cursor([[1], [2]])
cursor.advance_row()
self.assertEqual(cursor.read(), 2)