In fixed-size chunking, create a new chunk after returning the old one

integration_tests/fixed_test.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+# Sanity test for the fixed-size chunking algorithm
+
+. ./test_functions.sh
+
+fixture
+
+pushd ${TEST_REPO}
+${DUPLICACY} init integration-tests $TEST_STORAGE -c 64 -max 64 -min 64 
+
+add_file file3
+add_file file4
+
+
+${DUPLICACY} backup 
+${DUPLICACY} check --files -stats
+popd