Function testFork

core/blockchain_test.go:70–96

Test fork of length N starting from block i

(t *testing.T, blockchain *BlockChain, i, n int, comparator func(td1, td2 *big.Int))

// Test fork of length N starting from block i
func testFork(t *testing.T, blockchain *BlockChain, i, n int, comparator func(td1, td2 *big.Int)) {
	// Copy old chain up to #i into a new db
	db := database.NewMemDatabase()
	blockchain2, err := newCanonical(fakeDpor(db), i, db)

	if err != nil {
		t.Fatal("could not make new canonical in testFork", err)
	}
	defer blockchain2.Stop()

	// Assert the chains have the same header/block at #i
	var hash1, hash2 common.Hash
	hash1 = blockchain.GetBlockByNumber(uint64(i)).Hash()
	hash2 = blockchain2.GetBlockByNumber(uint64(i)).Hash()

	if hash1 != hash2 {
		t.Errorf("chain content mismatch at %d: have hash %v, want hash %v", i, hash2, hash1)
	}
	// Extend the newly created chain
	var (
		blockChainB []*types.Block
	)
	blockChainB = makeBlockChain(blockchain2.CurrentBlock(), n, fakeDpor(db), db, forkSeed)
	if _, err := blockchain2.InsertChain(blockChainB); err != nil {
		t.Fatalf("failed to insert forking chain: %v", err)
	}
}

// testBlockChainImport tries to process a chain of blocks, writing them into
// the database if successful.