Add two sum challenge

arrays_strings/two_sum/test_two_sum.py

@@ -0,0 +1,23 @@
+from nose.tools import assert_equal, assert_raises
+
+
+class TestTwoSum(object):
+
+    def test_two_sum(self):
+        solution = Solution()
+        assert_raises(TypeError, solution.two_sum, None, None)
+        assert_raises(ValueError, solution.two_sum, [], 0)
+        target = 7
+        nums = [1, 3, 2, -7, 5]
+        expected = [2, 4]
+        assert_equal(solution.two_sum(nums, target), expected)
+        print('Success: test_two_sum')
+
+
+def main():
+    test = TestTwoSum()
+    test.test_two_sum()
+
+
+if __name__ == '__main__':
+    main()