miner_getExtraData unit tests

Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>

Author: fab-10

ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/miner/MinerGetExtraDataTest.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright contributors to Hyperledger Besu.
+ *
+ * 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.api.jsonrpc.internal.methods.miner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.hyperledger.besu.ethereum.api.jsonrpc.internal.JsonRpcRequest;
+import org.hyperledger.besu.ethereum.api.jsonrpc.internal.JsonRpcRequestContext;
+import org.hyperledger.besu.ethereum.api.jsonrpc.internal.response.JsonRpcResponse;
+import org.hyperledger.besu.ethereum.api.jsonrpc.internal.response.JsonRpcSuccessResponse;
+import org.hyperledger.besu.ethereum.core.ImmutableMiningParameters;
+import org.hyperledger.besu.ethereum.core.MiningParameters;
+
+import org.apache.tuweni.bytes.Bytes;
+import org.junit.jupiter.api.Test;
+
+public class MinerGetExtraDataTest {
+
+  @Test
+  public void shouldReturnDefaultExtraData() {
+    final MiningParameters miningParameters = ImmutableMiningParameters.newDefault();
+    final MinerGetExtraData method = new MinerGetExtraData(miningParameters);
+    final JsonRpcRequestContext request =
+        new JsonRpcRequestContext(new JsonRpcRequest("2.0", method.getName(), new Object[] {}));
+
+    final JsonRpcResponse expected = new JsonRpcSuccessResponse(request.getRequest().getId(), "0x");
+
+    final JsonRpcResponse actual = method.response(request);
+    assertThat(actual).usingRecursiveComparison().isEqualTo(expected);
+  }
+
+  @Test
+  public void shouldReturnSetAtRuntimeExtraData() {
+    final MiningParameters miningParameters = ImmutableMiningParameters.newDefault();
+    final MinerGetExtraData method = new MinerGetExtraData(miningParameters);
+    final var extraData = "0x123456";
+    final Bytes extraDataAtRuntime = Bytes.fromHexString(extraData);
+
+    miningParameters.setExtraData(extraDataAtRuntime);
+
+    final JsonRpcRequestContext request =
+        new JsonRpcRequestContext(new JsonRpcRequest("2.0", method.getName(), new Object[] {}));
+
+    final JsonRpcResponse expected =
+        new JsonRpcSuccessResponse(request.getRequest().getId(), extraData);
+
+    final JsonRpcResponse actual = method.response(request);
+    assertThat(actual).usingRecursiveComparison().isEqualTo(expected);
+  }
+}