diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index c7fca14..4c9e3fb 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -17,6 +17,7 @@ jobs:
         python -m pip install --upgrade pip
         pip install -r tests-requirements.txt
         pip install -r requirements.txt
+        sudo apt-get install shellcheck
     - name: Run tests
       run: |
         ./tests.sh
diff --git a/catcli/noder.py b/catcli/noder.py
index 996c733..c6390fe 100644
--- a/catcli/noder.py
+++ b/catcli/noder.py
@@ -322,11 +322,11 @@ class Noder:
         """
         if not node:
             return
-        if node.type == node.TYPE_TOP:
+        if node.type == nodes.TYPE_TOP:
             return
 
         out = []
-        if node.type == node.TYPE_STORAGE:
+        if node.type == nodes.TYPE_STORAGE:
             # handle storage
             out.append(node.name)   # name
             out.append(node.type)   # type
@@ -357,7 +357,7 @@ class Noder:
                 out.append(epoch_to_str(node.maccess))  # maccess
             else:
                 out.append('')  # fake maccess
-            if node.md5:
+            if self._has_attr(node, 'md5'):
                 out.append(node.md5)  # md5
             else:
                 out.append('')  # fake md5
diff --git a/tests-ng/assets/github.catalog.csv.txt b/tests-ng/assets/github.catalog.csv.txt
new file mode 100644
index 0000000..27c7f31
--- /dev/null
+++ b/tests-ng/assets/github.catalog.csv.txt
@@ -0,0 +1,5 @@
+"github","storage","","2380","2023-03-08 20:58:18","","","2","23343173632","245107195904",""
+"workflows","dir","github/workflows","1190","2023-03-08 20:58:18","2023-03-02 10:15:30","","2","","",""
+"pypi-release.yml","file","github/workflows/pypi-release.yml","691","2023-03-08 20:58:18","2022-10-19 21:00:37","57699a7a6a03e20e864f220e19f8e197","","","",""
+"testing.yml","file","github/workflows/testing.yml","595","2023-03-08 20:58:18","2023-03-02 10:15:30","f4f4bc5acb9deae488b55f0c9c507120","","","",""
+"FUNDING.yml","file","github/FUNDING.yml","17","2023-03-08 20:58:18","2022-10-19 21:00:37","0c6407a84d412c514007313fb3bca4de","","","",""
diff --git a/tests-ng/assets/github.catalog.json b/tests-ng/assets/github.catalog.json
index 6c5fbe7..339358b 100644
--- a/tests-ng/assets/github.catalog.json
+++ b/tests-ng/assets/github.catalog.json
@@ -5,7 +5,7 @@
       "children": [
         {
           "maccess": 1666206037.0786593,
-          "md5": null,
+          "md5": "0c6407a84d412c514007313fb3bca4de",
           "name": "FUNDING.yml",
           "relpath": "/FUNDING.yml",
           "size": 17,
@@ -15,7 +15,7 @@
           "children": [
             {
               "maccess": 1666206037.078865,
-              "md5": null,
+              "md5": "57699a7a6a03e20e864f220e19f8e197",
               "name": "pypi-release.yml",
               "relpath": "workflows/pypi-release.yml",
               "size": 691,
@@ -23,7 +23,7 @@
             },
             {
               "maccess": 1677748530.6920426,
-              "md5": null,
+              "md5": "f4f4bc5acb9deae488b55f0c9c507120",
               "name": "testing.yml",
               "relpath": "workflows/testing.yml",
               "size": 595,
@@ -38,18 +38,18 @@
           "type": "dir"
         }
       ],
-      "free": 23459602432,
+      "free": 23343173632,
       "name": "github",
       "size": 2380,
       "total": 245107195904,
-      "ts": 1678214993,
+      "ts": 1678305498,
       "type": "storage"
     },
     {
       "attr": {
-        "access": 1678214993,
+        "access": 1678305498,
         "access_version": "0.8.7",
-        "created": 1678214993,
+        "created": 1678305498,
         "created_version": "0.8.7"
       },
       "name": "meta",
diff --git a/tests-ng/assets/github.catalog.native.txt b/tests-ng/assets/github.catalog.native.txt
new file mode 100644
index 0000000..40f187e
--- /dev/null
+++ b/tests-ng/assets/github.catalog.native.txt
@@ -0,0 +1,7 @@
+top
+└── storage: github
+  nbfiles:2 | totsize:2380 | free:9.5% | du:221764022272/245107195904 | date:2023-03-08 20:58:18
+    ├── workflows [nbfiles:2, totsize:1190]
+    │   ├── pypi-release.yml [size:691, md5:57699a7a6a03e20e864f220e19f8e197]
+    │   └── testing.yml [size:595, md5:f4f4bc5acb9deae488b55f0c9c507120]
+    └── FUNDING.yml [size:17, md5:0c6407a84d412c514007313fb3bca4de]
diff --git a/tests-ng/compare.sh b/tests-ng/compare.sh
index 2c6289d..7b92d87 100755
--- a/tests-ng/compare.sh
+++ b/tests-ng/compare.sh
@@ -49,11 +49,18 @@ clear_on_exit "${tmpd}"
 catalog="${tmpd}/catalog"
 
 # index
-${bin} -B index --catalog="${catalog}" github .github
-
-# diff
+${bin} -B index -c --catalog="${catalog}" github .github
 cat "${catalog}"
-diff "${cur}/assets/github.catalog.json" "${catalog}"
+
+# make sure we still get the same output in native format
+native="${tmpd}/native.txt"
+${bin} -B ls -r -s --format=native --catalog="${catalog}" > "${native}"
+diff -I '^.*| totsize.*$' "${cur}/assets/github.catalog.native.txt" "${native}"
+
+# make sure we still get the same output in csv
+csv="${tmpd}/csv.txt"
+${bin} -B ls -r -s --format=csv --catalog="${catalog}" > "${csv}"
+diff -I '^.*| totsize.*$' "${cur}/assets/github.catalog.csv.txt" "${csv}"
 
 # the end
 echo "test \"$(basename "$0")\" success"