public void HmacRequires_AllArguments()
{
var hmacMock = new Mock <HMAC>();
var ex1 = Assert.Throws <ArgumentNullException>(() =>
ByteArrayExtensions.Hmac(null, hmacMock.Object));
var ex2 = Assert.Throws <ArgumentNullException>(() => new byte[0].Hmac(hmacMock.Object));
var ex3 = Assert.Throws <ArgumentNullException>(() => new byte[1].Hmac(null));
Assert.Equal("bytes", ex1.ParamName);
Assert.Equal("bytes", ex2.ParamName);
Assert.Equal("hmac", ex3.ParamName);
}