def test_solutions_1():
sol = Solution()
x = [1,3,2,4,2,3,4]
result = sol.singleNumber(x)
assert result == 1
def test_solution(test_input, expected):
s = Solution()
assert s.singleNumber(test_input) == expected
def test_solutions_2():
sol = Solution()
x = [9, 323232,1233,323232,1233]
result = sol.singleNumber(x)
assert result == 9
