Create unit tests for EthBlockNumber (#195)

ethereum/jsonrpc/src/test/java/tech/pegasys/pantheon/ethereum/jsonrpc/internal/methods/EthBlockNumberTest.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2018 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.
+ */
+package tech.pegasys.pantheon.ethereum.jsonrpc.internal.methods;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.when;
+
+import tech.pegasys.pantheon.ethereum.jsonrpc.internal.JsonRpcRequest;
+import tech.pegasys.pantheon.ethereum.jsonrpc.internal.queries.BlockchainQueries;
+import tech.pegasys.pantheon.ethereum.jsonrpc.internal.response.JsonRpcResponse;
+import tech.pegasys.pantheon.ethereum.jsonrpc.internal.response.JsonRpcSuccessResponse;
+import tech.pegasys.pantheon.ethereum.jsonrpc.internal.results.Quantity;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+@RunWith(MockitoJUnitRunner.class)
+public class EthBlockNumberTest {
+
+  private final String JSON_RPC_VERSION = "2.0";
+  private final String ETH_METHOD = "eth_blockNumber";
+
+  @Mock private BlockchainQueries blockchainQueries;
+  private EthBlockNumber method;
+
+  @Before
+  public void setUp() {
+    method = new EthBlockNumber(blockchainQueries);
+  }
+
+  @Test
+  public void shouldReturnCorrectMethodName() {
+    assertThat(method.getName()).isEqualTo(ETH_METHOD);
+  }
+
+  @Test
+  public void shouldReturnCorrectResult() {
+    final long headBlockNumber = 123456L;
+
+    when(blockchainQueries.headBlockNumber()).thenReturn(headBlockNumber);
+
+    final JsonRpcRequest request =
+        new JsonRpcRequest(JSON_RPC_VERSION, ETH_METHOD, new Object[] {});
+
+    final JsonRpcResponse expected =
+        new JsonRpcSuccessResponse(request.getId(), Quantity.create(headBlockNumber));
+    final JsonRpcResponse actual = method.response(request);
+
+    assertThat(actual).isEqualToComparingFieldByFieldRecursively(expected);
+  }
+}