test: toward more thorough read/write shard tests

Author: bogovicj

src/test/java/org/janelia/saalfeldlab/n5/shard/ShardTest.java

@@ -56,7 +56,9 @@
 import java.nio.file.NoSuchFileException;
 import java.util.*;
 import java.util.function.Function;
+import java.util.stream.Collectors;
 import java.util.stream.IntStream;
+import java.util.stream.Stream;
 
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
@@ -457,6 +459,14 @@ public void writeReadShardTest() {
 			assertArrayEquals(new int[]{2, 3, 6, 7}, (int[])n5.readBlock(dataset, attrs, 1, 0).getData());
 			assertArrayEquals(new int[]{8, 9, 12, 13}, (int[])n5.readBlock(dataset, attrs, 0, 1).getData());
 			assertArrayEquals(new int[]{10, 11, 14, 15}, (int[])n5.readBlock(dataset, attrs, 1, 1).getData());
+
+			System.out.println("delete");
+			n5.deleteBlock(dataset, attrs, new long[]{1, 1});
+
+			System.out.println("read");
+			final DataBlock<int[]> partlyEmptyShard = n5.readShard(dataset, attrs, 0, 0);
+			System.out.println(Arrays.toString(partlyEmptyShard.getData()));
+			System.out.println("done");
 		}
 	}