import unittest
from app import greet


class TestGreet(unittest.TestCase):
    def test_greet_returns_hello_with_name(self):
        """Test that greet function returns 'Hello [name]!!' for a given name."""
        result = greet("Alice")
        self.assertEqual(result, "Hello Alice!!")
        
        result = greet("Bob")
        self.assertEqual(result, "Hello Bob!!")
        
        result = greet("World")
        self.assertEqual(result, "Hello World!!")


if __name__ == "__main__":
    unittest.main()