Verify that Py/Go Snappy encoded files can be decoded

ethereumj-core/src/test/java/org/ethereum/net/rlpx/SnappyCodecTest.java

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+/*
+ * Copyright (c) [2017] [ <ether.camp> ]
+ * This file is part of the ethereumJ library.
+ *
+ * The ethereumJ library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The ethereumJ library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with the ethereumJ library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ */
+
+package org.ethereum.net.rlpx;
+
+import org.ethereum.net.server.Channel;
+import org.junit.Test;
+import org.spongycastle.util.encoders.Hex;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.Resource;
+import org.springframework.util.FileCopyUtils;
+
+import java.util.List;
+
+import static com.google.common.collect.Lists.newArrayList;
+import static org.junit.Assert.*;
+
+/**
+ * EIP-706 provides snappy samples. FrameCodec should be
+ * able to decode these samples.
+ */
+public class SnappyCodecTest {
+    @Test
+    public void test_decode_go_generated_snappy() throws Exception {
+        Resource golangGeneratedSnappy = new ClassPathResource("/rlp/block.go.snappy");
+        List<Object> result = snappyDecode(golangGeneratedSnappy);
+        assertEquals(1, result.size());
+    }
+
+    @Test
+    public void test_decode_python_generated_snappy() throws Exception {
+        Resource pythonGeneratedSnappy = new ClassPathResource("/rlp/block.py.snappy");
+        List<Object> result = snappyDecode(pythonGeneratedSnappy);
+        assertEquals(1, result.size());
+    }
+
+    private List<Object> snappyDecode(Resource hexEncodedSnappyResource) throws Exception {
+        Channel channel = new Channel();
+        SnappyCodec codec = new SnappyCodec(channel);
+
+        byte[] golangSnappyBytes = FileCopyUtils.copyToByteArray(hexEncodedSnappyResource.getInputStream());
+        FrameCodec.Frame msg = new FrameCodec.Frame(1, Hex.decode(golangSnappyBytes));
+
+        List<Object> result = newArrayList();
+        codec.decode(null, msg, result);
+        return result;
+    }
+}