public void GetBytes_ExceptionTest()
{
PBKDF2 kdf = new PBKDF2(1000, new HmacSha256());
byte[] pass = new byte[1];
byte[] salt = new byte[1];
Exception ex = Assert.Throws <ArgumentNullException>(() => kdf.GetBytes(null, salt, 32));
Assert.Contains("Password can not be null.", ex.Message);
ex = Assert.Throws <ArgumentNullException>(() => kdf.GetBytes(pass, null, 32));
Assert.Contains("Salt can not be null.", ex.Message);
ex = Assert.Throws <ArgumentOutOfRangeException>(() => kdf.GetBytes(pass, salt, -1));
Assert.Contains("Derived key length must be bigger than zero.", ex.Message);
kdf.Dispose();
ex = Assert.Throws <ObjectDisposedException>(() => kdf.GetBytes(pass, salt, 10));
Assert.Contains("Instance was disposed.", ex.Message);
}