def test_diff_none(self): data = [] result = diff(data) self.assertEqual(result, 0)
def test_diff_largenums(self): data = [-7529383821,4738494329] result = diff(data) self.assertEqual(result, 2790889492)
def test_diff_value_missing(self): data = [3] result = diff(data) self.assertEqual(result, -3)
def test_diff_zero(self): data = [0,4] result = diff(data) self.assertEqual(result, -4)
def test_diff_pos_neg(self): data = [-3,4] result = diff(data) self.assertEqual(result, -1)
def test_diff_neg(self): data = [3,-4] result = diff(data) self.assertEqual(result, 1)
def test_diff_pos(self): data = [-13,4] result = diff(data) self.assertEqual(result, 9)