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Add the start of unit tests covering chain splits/reorgs, along with supporting code. The tests don't pass yet so they are marked @Ignore.

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Mike Hearn
2011-03-15 13:58:52 +00:00
parent d58ad311fe
commit 5e2e48eb5a
3 changed files with 81 additions and 7 deletions
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59
tests/com/google/bitcoin/core/BlockChainTest.java
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@@ -18,6 +18,7 @@ package com.google.bitcoin.core;
import com.google.bitcoin.bouncycastle.util.encoders.Hex;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;
import java.math.BigInteger;
@@ -62,6 +63,64 @@ public class BlockChainTest {
assertTrue(chain.add(b2));
}
private Block createNextBlock(Address to, Block prev) throws VerificationException {
Block b = new Block(prev.params);
b.setDifficultyTarget(Block.EASIEST_DIFFICULTY_TARGET);
b.addCoinbaseTransaction(to);
b.setPrevBlockHash(prev.getHash());
b.solve();
b.verify();
return b;
}
@Test @Ignore
public void testForking() throws Exception {
// Check that if the block chain forks, we end up using the right one.
NetworkParameters unitTestParams = NetworkParameters.unitTests();
Wallet wallet = new Wallet(unitTestParams);
wallet.addKey(new ECKey());
Address coinbaseTo = wallet.keychain.get(0).toAddress(unitTestParams);
// Start by building a couple of blocks on top of the genesis block.
Block b1 = createNextBlock(coinbaseTo, unitTestParams.genesisBlock);
Block b2 = createNextBlock(coinbaseTo, b1);
chain = new BlockChain(unitTestParams, wallet);
chain.add(b1);
chain.add(b2);
// We got two blocks which generated 50 coins each, to us.
assertEquals("100.00", Utils.bitcoinValueToFriendlyString(wallet.getBalance()));
// We now have the following chain:
// genesis -> b1 -> b2
//
// so fork like this:
//
// genesis -> b1 -> b2
// \-> b3
//
// Nothing should happen at this point. We saw b2 first so it takes priority.
Address someOtherGuy = new ECKey().toAddress(unitTestParams);
Block b3 = createNextBlock(someOtherGuy, b1);
chain.add(b3);
assertEquals("100.00", Utils.bitcoinValueToFriendlyString(wallet.getBalance()));
// Now we add another block to make the alternative chain longer.
chain.add(createNextBlock(someOtherGuy, b3));
//
// genesis -> b1 -> b2
// \-> b3 -> b4
//
// We lost some coins! b2 is no longer a part of the best chain so our balance should drop to 50 again.
assertEquals("50.00", Utils.bitcoinValueToFriendlyString(wallet.getBalance()));
// ... and back to the first chain
Block b5 = createNextBlock(coinbaseTo, b2);
Block b6 = createNextBlock(coinbaseTo, b5);
chain.add(b5);
chain.add(b6);
//
// genesis -> b1 -> b2 -> b5 -> b6
// \-> b3 -> b4
//
assertEquals("200.00", Utils.bitcoinValueToFriendlyString(wallet.getBalance()));
}
@Test
public void testBadDifficulty() throws Exception {
assertTrue(chain.add(getBlock1()));