public void testAdditionalEdgeField() { GraphExtension extStorage = new GraphExtension() { @Override public boolean isRequireNodeField() { return false; } @Override public boolean isRequireEdgeField() { return true; } @Override public int getDefaultNodeFieldValue() { throw new UnsupportedOperationException("Not supported."); } @Override public int getDefaultEdgeFieldValue() { return 2; } @Override public void init(Graph graph, Directory dir) {} @Override public void setSegmentSize(int bytes) {} @Override public GraphExtension copyTo(GraphExtension extStorage) { return this; } @Override public boolean loadExisting() { return true; } @Override public GraphExtension create(long byteCount) { return this; } @Override public void flush() {} @Override public void close() {} @Override public boolean isClosed() { return false; } @Override public long getCapacity() { return 0; } }; GraphHopperStorage storage = new GraphHopperStorage(new RAMDirectory(), encodingManager, false, extStorage); storage.create(1000); EdgeIteratorState iter = storage.edge(0, 1, 10, true); assertEquals(extStorage.getDefaultEdgeFieldValue(), iter.getAdditionalField()); }