Blob blob = new BlobStoreBlob(blobStore, "foo");
assertEquals("foo", blobSerializer.serialize(blob));
assertEquals(0, blobStore.writeCount);
blob = new ArrayBasedBlob("foo".getBytes());
blobSerializer.serialize(blob);
assertEquals(1, blobStore.writeCount);
byte[] bytes = "foo".getBytes();
String blobId = blobStore.writeBlob(new ByteArrayInputStream(bytes));