def test_emptyList(self):
expected = -1
actual = firstDuplicate([])
self.assertEqual(actual, expected)
def test_11(self):
expected = -1
actual = firstDuplicate([10, 6, 8, 4, 9, 1, 7, 2, 5, 3])
self.assertEqual(actual, expected)
def test_12(self):
expected = 1
actual = firstDuplicate([1, 1, 2, 2, 1])
self.assertEqual(actual, expected)
def test_9(self):
expected = 3
actual = firstDuplicate([3, 3, 3])
self.assertEqual(actual, expected)
def test_10(self):
expected = 6
actual = firstDuplicate([8, 4, 6, 2, 6, 4, 7, 9, 5, 8])
self.assertEqual(actual, expected)
def test_7(self):
expected = -1
actual = firstDuplicate([2, 1, 3])
self.assertEqual(actual, expected)
def test_5(self):
expected = 5
actual = firstDuplicate([5, 5, 5, 5, 5])
self.assertEqual(actual, expected)
def test_3(self):
expected = -1
actual = firstDuplicate(self.example3)
self.assertEqual(actual, expected)
def test_2(self):
expected = 2
actual = firstDuplicate(self.example2)
self.assertEqual(actual, expected)
def test_1(self):
expected = 3
actual = firstDuplicate(self.example1)
self.assertEqual(actual, expected)