Round trip testing of state trie account values (#31)

Signed-off-by: Peter  Robinson <drinkcoffee@eml.cc>

ethereum/core/src/test/java/org/hyperledger/besu/ethereum/worldstate/StateTrieAccountValueTest.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2019 ConsenSys AG.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package org.hyperledger.besu.ethereum.worldstate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.hyperledger.besu.ethereum.core.Hash;
+import org.hyperledger.besu.ethereum.core.Wei;
+import org.hyperledger.besu.ethereum.rlp.RLP;
+import org.hyperledger.besu.ethereum.rlp.RLPInput;
+import org.hyperledger.besu.util.bytes.BytesValue;
+
+import org.junit.Test;
+
+public class StateTrieAccountValueTest {
+
+  @Test
+  public void roundTripMainNetAccountValueVersionZero() {
+    final long nonce = 0;
+    final Wei balance = Wei.ZERO;
+    // Have the storageRoot and codeHash as different values to ensure the encode / decode
+    // doesn't cross the values over.
+    final Hash storageRoot = Hash.EMPTY_TRIE_HASH;
+    final Hash codeHash = Hash.EMPTY_LIST_HASH;
+    final int version = 0;
+
+    roundTripMainNetAccountValue(nonce, balance, storageRoot, codeHash, version);
+  }
+
+  @Test
+  public void roundTripMainNetAccountValueVersionNotZero() {
+    final long nonce = 0;
+    final Wei balance = Wei.ZERO;
+    final Hash storageRoot = Hash.EMPTY_TRIE_HASH;
+    final Hash codeHash = Hash.EMPTY_LIST_HASH;
+    final int version = 1;
+
+    roundTripMainNetAccountValue(nonce, balance, storageRoot, codeHash, version);
+  }
+
+  @Test
+  public void roundTripMainNetAccountValueMax() {
+    final long nonce = (Long.MAX_VALUE >> 1);
+    final Wei balance =
+        Wei.fromHexString("0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF");
+    final Hash storageRoot = Hash.EMPTY_TRIE_HASH;
+    final Hash codeHash = Hash.EMPTY_LIST_HASH;
+    final int version = Integer.MAX_VALUE;
+
+    roundTripMainNetAccountValue(nonce, balance, storageRoot, codeHash, version);
+  }
+
+  private void roundTripMainNetAccountValue(
+      final long nonce,
+      final Wei balance,
+      final Hash storageRoot,
+      final Hash codeHash,
+      final int version) {
+
+    StateTrieAccountValue accountValue =
+        new StateTrieAccountValue(nonce, balance, storageRoot, codeHash, version);
+    BytesValue encoded = RLP.encode(accountValue::writeTo);
+    final RLPInput in = RLP.input(encoded);
+    StateTrieAccountValue roundTripAccountValue = StateTrieAccountValue.readFrom(in);
+
+    assertThat(nonce).isEqualTo(roundTripAccountValue.getNonce());
+    assertThat(balance).isEqualTo(roundTripAccountValue.getBalance());
+    assertThat(storageRoot).isEqualTo(roundTripAccountValue.getStorageRoot());
+    assertThat(codeHash).isEqualTo(roundTripAccountValue.getCodeHash());
+    assertThat(version).isEqualTo(roundTripAccountValue.getVersion());
+  }
+}