diff --git a/t/t5300-pack-object.sh b/t/t5300-pack-object.sh
index 17befde757..eacb1e92c2 100755
--- a/t/t5300-pack-object.sh
+++ b/t/t5300-pack-object.sh
@@ -64,7 +64,7 @@ test_expect_success \
 cd "$TRASH"
 
 test_expect_success \
-    'pack with delta' \
+    'pack with REF_DELTA' \
     'pwd &&
      packname_2=$(git-pack-objects test-2 <obj-list)'
 
@@ -72,7 +72,7 @@ rm -fr .git2
 mkdir .git2
 
 test_expect_success \
-    'unpack with delta' \
+    'unpack with REF_DELTA' \
     'GIT_OBJECT_DIRECTORY=.git2/objects &&
      export GIT_OBJECT_DIRECTORY &&
      git-init &&
@@ -82,7 +82,7 @@ test_expect_success \
 unset GIT_OBJECT_DIRECTORY
 cd "$TRASH/.git2"
 test_expect_success \
-    'check unpack with delta' \
+    'check unpack with REF_DELTA' \
     '(cd ../.git && find objects -type f -print) |
      while read path
      do
@@ -93,6 +93,42 @@ test_expect_success \
      done'
 cd "$TRASH"
 
+test_expect_success \
+    'pack with OFS_DELTA' \
+    'pwd &&
+     packname_3=$(git-pack-objects --delta-base-offset test-3 <obj-list)'
+
+rm -fr .git2
+mkdir .git2
+
+test_expect_success \
+    'unpack with OFS_DELTA' \
+    'GIT_OBJECT_DIRECTORY=.git2/objects &&
+     export GIT_OBJECT_DIRECTORY &&
+     git-init &&
+     git-unpack-objects -n <test-3-${packname_3}.pack &&
+     git-unpack-objects <test-3-${packname_3}.pack'
+
+unset GIT_OBJECT_DIRECTORY
+cd "$TRASH/.git2"
+test_expect_success \
+    'check unpack with OFS_DELTA' \
+    '(cd ../.git && find objects -type f -print) |
+     while read path
+     do
+         cmp $path ../.git/$path || {
+	     echo $path differs.
+	     return 1
+	 }
+     done'
+cd "$TRASH"
+
+test_expect_success \
+    'compare delta flavors' \
+    'size_2=`stat -c "%s" test-2-${packname_2}.pack` &&
+     size_3=`stat -c "%s" test-3-${packname_3}.pack` &&
+     test $size_2 -gt $size_3'
+
 rm -fr .git2
 mkdir .git2
 
@@ -111,9 +147,8 @@ test_expect_success \
     } >current &&
     diff expect current'
 
-
 test_expect_success \
-    'use packed deltified objects' \
+    'use packed deltified (REF_DELTA) objects' \
     'GIT_OBJECT_DIRECTORY=.git2/objects &&
      export GIT_OBJECT_DIRECTORY &&
      rm .git2/objects/pack/test-* &&
@@ -127,11 +162,28 @@ test_expect_success \
     } >current &&
     diff expect current'
 
+test_expect_success \
+    'use packed deltified (OFS_DELTA) objects' \
+    'GIT_OBJECT_DIRECTORY=.git2/objects &&
+     export GIT_OBJECT_DIRECTORY &&
+     rm .git2/objects/pack/test-* &&
+     cp test-3-${packname_3}.pack test-3-${packname_3}.idx .git2/objects/pack && {
+	 git-diff-tree --root -p $commit &&
+	 while read object
+	 do
+	    t=`git-cat-file -t $object` &&
+	    git-cat-file $t $object || return 1
+	 done <obj-list
+    } >current &&
+    diff expect current'
+
 unset GIT_OBJECT_DIRECTORY
 
 test_expect_success \
     'verify pack' \
-    'git-verify-pack test-1-${packname_1}.idx test-2-${packname_2}.idx'
+    'git-verify-pack	test-1-${packname_1}.idx \
+			test-2-${packname_2}.idx \
+			test-3-${packname_3}.idx'
 
 test_expect_success \
     'corrupt a pack and see if verify catches' \
@@ -194,6 +246,13 @@ test_expect_success \
      git-index-pack test-3.pack &&
      cmp test-3.idx test-2-${packname_2}.idx &&
 
+     cp test-3-${packname_3}.pack test-3.pack &&
+     git-index-pack -o tmp.idx test-3-${packname_3}.pack &&
+     cmp tmp.idx test-3-${packname_3}.idx &&
+
+     git-index-pack test-3.pack &&
+     cmp test-3.idx test-3-${packname_3}.idx &&
+
      :'
 
 test_done