Added in a fixed difficulty acceptance test.

acceptance-tests/src/test/java/tech/pegasys/pantheon/tests/acceptance/dsl/node/factory/PantheonNodeFactory.java

@@ -27,6 +27,7 @@
 import tech.pegasys.pantheon.ethereum.jsonrpc.websocket.WebSocketConfiguration;
 import tech.pegasys.pantheon.ethereum.permissioning.PermissioningConfiguration;
 import tech.pegasys.pantheon.tests.acceptance.dsl.node.GenesisConfigProvider;
+import tech.pegasys.pantheon.tests.acceptance.dsl.node.Node;
 import tech.pegasys.pantheon.tests.acceptance.dsl.node.PantheonNode;
 import tech.pegasys.pantheon.tests.acceptance.dsl.node.RunnableNode;
 
@@ -119,6 +120,24 @@ public PantheonNode createArchiveNodeWithP2pDisabled(final String name) throws I
             .webSocketEnabled()
             .build());
   }
+  public Node createFixedDifficultyMinerNode(final String name) throws IOException {
+    return create(
+        new PantheonFactoryConfigurationBuilder()
+            .setName(name)
+            .miningEnabled()
+            .setDevMode(false)
+            .jsonRpcEnabled()
+            .webSocketEnabled()
+            .setGenesisConfigProvider(this::createFixedDifficultyGenesisConfig)
+            .build());
+
+  }
+
+  private Optional<String> createFixedDifficultyGenesisConfig(
+      final Collection<? extends RunnableNode> runnableNodes) {
+      final String template = genesisTemplateConfig("fixed/fixed.json");
+    return Optional.of(template);
+    }
 
   public PantheonNode createArchiveNodeWithCustomRefreshDelay(
       final String name, final Long refreshDelay) throws IOException {
@@ -346,4 +365,5 @@ private JsonRpcConfiguration createJsonRpcConfigWithRpcApiEnabled(final RpcApi r
     jsonRpcConfig.setRpcApis(rpcApis);
     return jsonRpcConfig;
   }
+
 }

acceptance-tests/src/test/java/tech/pegasys/pantheon/tests/acceptance/mining/FixedMiningDifficultyAcceptanceTest.java

@@ -0,0 +1,42 @@
+package tech.pegasys.pantheon.tests.acceptance.mining;
+
+import static org.web3j.utils.Convert.Unit.ETHER;
+
+import org.junit.Before;
+import org.junit.Test;
+import tech.pegasys.pantheon.tests.acceptance.dsl.AcceptanceTestBase;
+import tech.pegasys.pantheon.tests.acceptance.dsl.account.Account;
+import tech.pegasys.pantheon.tests.acceptance.dsl.node.Node;
+
+public class FixedMiningDifficultyAcceptanceTest  extends AcceptanceTestBase {
+  private Node minerNode;
+
+  @Before
+  public void setUp() throws Exception {
+    minerNode = pantheon.createFixedDifficultyMinerNode("node1");
+    cluster.start(minerNode);
+  }
+
+  @Test
+  public void shouldMineTransactions() {
+    final Account sender = accounts.createAccount("account1");
+    final Account receiver = accounts.createAccount("account2");
+    minerNode.execute(transactions.createTransfer(sender, 50));
+    cluster.verify(sender.balanceEquals(50));
+
+    minerNode.execute(transactions.createIncrementalTransfers(sender, receiver, 1));
+    cluster.verify(receiver.balanceEquals(1));
+
+    minerNode.execute(transactions.createIncrementalTransfers(sender, receiver, 2));
+    cluster.verify(receiver.balanceEquals(3));
+
+    minerNode.execute(transactions.createIncrementalTransfers(sender, receiver, 3));
+    cluster.verify(receiver.balanceEquals(6));
+
+    minerNode.execute(transactions.createIncrementalTransfers(sender, receiver, 4));
+    cluster.verify(receiver.balanceEquals(10));
+
+    minerNode.execute(transactions.createIncrementalTransfers(sender, receiver, 5));
+    cluster.verify(receiver.balanceEquals(15));
+  }
+}

acceptance-tests/src/test/resources/fixed/fixed.json

@@ -0,0 +1,40 @@
+{
+  "config": {
+    "chainId": 4,
+    "homesteadBlock": 1,
+    "eip150Block": 2,
+    "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
+    "eip155Block": 3,
+    "eip158Block": 3,
+    "byzantiumBlock": 1035301,
+    "ethash": {
+      "fixeddifficulty": 100
+    }
+  },
+  "nonce": "0x0",
+  "timestamp": "0x58ee40ba",
+  "gasLimit": "0x47b760",
+  "difficulty": "0x1",
+  "mixHash": "0x63746963616c2062797a616e74696e65206661756c7420746f6c6572616e6365",
+  "coinbase": "0x0000000000000000000000000000000000000000",
+  "alloc": {
+    "fe3b557e8fb62b89f4916b721be55ceb828dbd73": {
+      "privateKey": "8f2a55949038a9610f50fb23b5883af3b4ecb3c3bb792cbcefbd1542c692be63",
+      "comment": "private key and this comment are ignored.  In a real chain, the private key should NOT be stored",
+      "balance": "0xad78ebc5ac6200000"
+    },
+    "627306090abaB3A6e1400e9345bC60c78a8BEf57": {
+      "privateKey": "c87509a1c067bbde78beb793e6fa76530b6382a4c0241e5e4a9ec0a0f44dc0d3",
+      "comment": "private key and this comment are ignored.  In a real chain, the private key should NOT be stored",
+      "balance": "90000000000000000000000"
+    },
+    "f17f52151EbEF6C7334FAD080c5704D77216b732": {
+      "privateKey": "ae6ae8e5ccbfb04590405997ee2d52d2b330726137b875053c36d94e974d162f",
+      "comment": "private key and this comment are ignored.  In a real chain, the private key should NOT be stored",
+      "balance": "90000000000000000000000"
+    }
+  },
+  "number": "0x0",
+  "gasUsed": "0x0",
+  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000"
+}