public void Hash_GeneratesValidHash_ForInput()
{
// Arrange
string input = "hello";
string key = "test";
string expected = "F151EA24BDA91A18E89B8BB5793EF324B2A02133CCE15A28A719ACBD2E58A986";
// Act
byte[] output = _hmac.Hash(input, key);
string outputHex = BitConverter.ToString(output).Replace("-", "").ToUpper();
// Assert
expected.Should().Be(outputHex);
}