public void TestDoubleSpend()
{
// prepare test kernel
var kernel = new StandardKernel(new MemoryStorageModule());
// prepare block
var fakeHeaders = new FakeHeaders();
var chainedHeader = new ChainedHeader(fakeHeaders.Genesis(), height: 0, totalWork: 0);
// prepare an unspent transaction
var txHash = new UInt256(100);
var unspentTx = new UnspentTx(chainedHeader.Hash, 1, OutputState.Unspent);
// mock a parent utxo containing the unspent transaction
var unspentTransactions = ImmutableDictionary.Create <UInt256, UnspentTx>().Add(txHash, unspentTx);
var mockParentChainStateStorage = new Mock <IChainStateStorage>();
mockParentChainStateStorage.Setup(utxo => utxo.UnspentTransactions()).Returns(unspentTransactions);
var parentUtxo = new Utxo(mockParentChainStateStorage.Object);
// initialize memory utxo builder storage
var memoryChainStateBuilderStorage = new MemoryChainStateBuilderStorage(mockParentChainStateStorage.Object);
kernel.Rebind <IChainStateBuilderStorage>().ToConstant(memoryChainStateBuilderStorage);
// initialize utxo builder
var chainStateBuilder = new ChainStateBuilder(null, parentUtxo, LogManager.CreateNullLogger(), kernel, null, null, null, null, null);
// create an input to spend the unspent transaction
var input = new TxInput(new TxOutputKey(txHash, txOutputIndex: 0), ImmutableArray.Create <byte>(), 0);
var tx = new Transaction(0, ImmutableArray.Create(input), ImmutableArray.Create <TxOutput>(), 0);
// spend the input
chainStateBuilder.Spend(0, tx, 0, input, chainedHeader);
// verify utxo storage
Assert.IsFalse(memoryChainStateBuilderStorage.UnspentTransactionsDictionary.ContainsKey(txHash));
// attempt to spend the input again
chainStateBuilder.Spend(0, tx, 0, input, chainedHeader);
// validation exception should be thrown
}
public void TestSimpleSpend()
{
// prepare test kernel
var kernel = new StandardKernel(new MemoryStorageModule());
// prepare block
var fakeHeaders = new FakeHeaders();
var chainedHeader = new ChainedHeader(fakeHeaders.Genesis(), height: 0, totalWork: 0);
// prepare an unspent transaction
var txHash = new UInt256(100);
var unspentTx = new UnspentTx(chainedHeader.Hash, 3, OutputState.Unspent);
// prepare unspent output
var unspentTransactions = ImmutableDictionary.Create <UInt256, UnspentTx>().Add(txHash, unspentTx);
var unspentOutputs = ImmutableDictionary.Create <TxOutputKey, TxOutput>()
.Add(new TxOutputKey(txHash, 0), new TxOutput(0, ImmutableArray.Create <byte>()))
.Add(new TxOutputKey(txHash, 1), new TxOutput(0, ImmutableArray.Create <byte>()))
.Add(new TxOutputKey(txHash, 2), new TxOutput(0, ImmutableArray.Create <byte>()));
// mock a parent utxo containing the unspent transaction
var mockParentChainStateStorage = new Mock <IChainStateStorage>();
mockParentChainStateStorage.Setup(utxo => utxo.UnspentTransactions()).Returns(unspentTransactions);
mockParentChainStateStorage.Setup(utxo => utxo.UnspentOutputs()).Returns(unspentOutputs);
var parentUtxo = new Utxo(mockParentChainStateStorage.Object);
// initialize memory utxo builder storage
var memoryChainStateBuilderStorage = new MemoryChainStateBuilderStorage(mockParentChainStateStorage.Object);
kernel.Rebind <IChainStateBuilderStorage>().ToConstant(memoryChainStateBuilderStorage);
// initialize utxo builder
var chainStateBuilder = new ChainStateBuilder(null, parentUtxo, LogManager.CreateNullLogger(), kernel, null, null, null, null, null);
// create an input to spend the unspent transaction's first output
var input0 = new TxInput(new TxOutputKey(txHash, txOutputIndex: 0), ImmutableArray.Create <byte>(), 0);
var tx0 = new Transaction(0, ImmutableArray.Create(input0), ImmutableArray.Create <TxOutput>(), 0);
// spend the input
chainStateBuilder.Spend(0, tx0, 0, input0, chainedHeader);
// verify utxo storage
Assert.IsTrue(memoryChainStateBuilderStorage.UnspentTransactionsDictionary.ContainsKey(txHash));
Assert.IsTrue(memoryChainStateBuilderStorage.UnspentTransactionsDictionary[txHash].OutputStates.Length == 3);
Assert.IsTrue(memoryChainStateBuilderStorage.UnspentTransactionsDictionary[txHash].OutputStates[0] == OutputState.Spent);
Assert.IsTrue(memoryChainStateBuilderStorage.UnspentTransactionsDictionary[txHash].OutputStates[1] == OutputState.Unspent);
Assert.IsTrue(memoryChainStateBuilderStorage.UnspentTransactionsDictionary[txHash].OutputStates[2] == OutputState.Unspent);
// create an input to spend the unspent transaction's second output
var input1 = new TxInput(new TxOutputKey(txHash, txOutputIndex: 1), ImmutableArray.Create <byte>(), 0);
var tx1 = new Transaction(0, ImmutableArray.Create(input1), ImmutableArray.Create <TxOutput>(), 0);
// spend the input
chainStateBuilder.Spend(1, tx1, 1, input1, chainedHeader);
// verify utxo storage
Assert.IsTrue(memoryChainStateBuilderStorage.UnspentTransactionsDictionary.ContainsKey(txHash));
Assert.IsTrue(memoryChainStateBuilderStorage.UnspentTransactionsDictionary[txHash].OutputStates.Length == 3);
Assert.IsTrue(memoryChainStateBuilderStorage.UnspentTransactionsDictionary[txHash].OutputStates[0] == OutputState.Spent);
Assert.IsTrue(memoryChainStateBuilderStorage.UnspentTransactionsDictionary[txHash].OutputStates[1] == OutputState.Spent);
Assert.IsTrue(memoryChainStateBuilderStorage.UnspentTransactionsDictionary[txHash].OutputStates[2] == OutputState.Unspent);
// create an input to spend the unspent transaction's third output
var input2 = new TxInput(new TxOutputKey(txHash, txOutputIndex: 2), ImmutableArray.Create <byte>(), 0);
var tx2 = new Transaction(0, ImmutableArray.Create(input2), ImmutableArray.Create <TxOutput>(), 0);
// spend the input
chainStateBuilder.Spend(2, tx2, 2, input2, chainedHeader);
// verify utxo storage
Assert.IsFalse(memoryChainStateBuilderStorage.UnspentTransactionsDictionary.ContainsKey(txHash));
}
