BlockFileLoaderBitcoindTest: new (ignored) integration test that reads bitcoind blocks

This is ignored because:

a) It requires bitcoind installation with a blockchain directory
b) It takes about 1 hour to run

integration-test/src/test/java/org/bitcoinj/util/BlockFileLoaderBitcoindTest.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright by the original author or authors.
+ *
+ * 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 org.bitcoinj.util;
+
+import org.bitcoinj.base.BitcoinNetwork;
+import org.bitcoinj.core.Block;
+import org.bitcoinj.core.Context;
+import org.bitcoinj.utils.BlockFileLoader;
+import org.junit.Before;
+import org.junit.Ignore;
+import org.junit.Test;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+
+/**
+ * This is an integration test that REQUIRES a local Bitcoin Core installation
+ */
+@Ignore("This requires a bitcoind installation AND takes a long time to run.")
+public class BlockFileLoaderBitcoindTest {
+
+    @Before
+    public void setUp() {
+        Context.propagate(new Context());
+    }
+
+    @Test
+    public void iterateEntireBitcoindBlockchain() {
+        BlockFileLoader loader = new BlockFileLoader(BitcoinNetwork.MAINNET, BlockFileLoader.getReferenceClientBlockFileList());
+
+        long blockCount = 0;
+        for (Block b : loader) {
+            blockCount++;
+            System.out.println("Block count: " + blockCount);
+        }
+        assertTrue(blockCount > 1);
+    }
+}