tests: Add a roundtrip test

This exercises edge cases in the dumpfile.

Signed-off-by: Colin Walters <[email protected]>

tests/test-units.sh

@@ -19,6 +19,21 @@ function countobjects () {
     find $dir/objects -type f | wc -l
 }
 
+# Test a full cycle of roundtrips through mkcomposefs --from-file, composefs-info dump, etc.
+function test_dump_roundtrip () {
+    testsrcdir=$(cd $(dirname $0) && pwd)
+    pushd $1
+    local src=$testsrcdir/assets/special.dump
+    $BINDIR/mkcomposefs --from-file "${src}" out.cfs
+    $BINDIR/composefs-info dump out.cfs > dump.txt
+    diff -u "${src}" dump.txt
+    $BINDIR/mkcomposefs --from-file dump.txt out2.cfs
+    diff -u out.cfs out2.cfs
+    echo "ok dump roundtrip"
+    popd
+}
+
+
 # Ensure small files are inlined
 function  test_inline () {
     local dir=$1
@@ -86,7 +101,7 @@ function test_composefs_info_measure_files () {
     cd -
 }
 
-TESTS="test_inline test_objects test_mount_digest test_composefs_info_measure_files"
+TESTS="test_dump_roundtrip test_inline test_objects test_mount_digest test_composefs_info_measure_files"
 res=0
 for i in $TESTS; do
     testdir=$(mktemp -d $workdir/$i.XXXXXX)