SVSimServer/SVSim.UnitTests/BattleNode/Wire/NodeCryptoTests.cs

using NUnit.Framework;
using SVSim.BattleNode.Wire;

namespace SVSim.UnitTests.BattleNode.Wire;

[TestFixture]
public class NodeCryptoTests
{
    [Test]
    public void EncryptThenDecrypt_RoundTripsArbitraryString()
    {
        const string plaintext = "{\"uri\":\"InitNetwork\",\"viewerId\":906243102,\"try\":0,\"cat\":99}";
        const string key = "Y2FmZWJhYmU3ZmY3ZmY3ZmY3ZmY3ZmY3"; // 32 chars

        var encrypted = NodeCrypto.EncryptForNode(plaintext, key);
        var decrypted = NodeCrypto.DecryptForNode(encrypted);

        Assert.That(decrypted, Is.EqualTo(plaintext));
    }

    [Test]
    public void GenerateKey_WithDeterministicSource_ProducesStable32CharOutput()
    {
        var seq = 0;
        string key = NodeCrypto.GenerateKey(() => seq++ % 16);

        Assert.That(key.Length, Is.EqualTo(32));
        // Two calls with the same source produce the same output.
        seq = 0;
        Assert.That(NodeCrypto.GenerateKey(() => seq++ % 16), Is.EqualTo(key));
    }

    [Test]
    public void EncryptForNode_NonStandardKeyLength_Throws()
    {
        Assert.Throws<ArgumentException>(() => NodeCrypto.EncryptForNode("x", "tooshort"));
    }

    [Test]
    public void DecryptForNode_TooShortInput_Throws()
    {
        Assert.Throws<ArgumentException>(() => NodeCrypto.DecryptForNode("tooshort"));
    }
}