diff --git a/basetest.py b/basetest.py
index 4c86344..779c9ee 100644
--- a/basetest.py
+++ b/basetest.py
@@ -9,6 +9,15 @@ from pprint import *
 from bin.zfs_autobackup import *
 
 
+def shelltest(cmd):
+    """execute and print result as nice copypastable string for unit tests (adds extra newlines on top/bottom)"""
+    ret=(subprocess.check_output(cmd , shell=True).decode('utf-8'))
+    print("######### result of: {}".format(cmd))
+    print(ret,end='')
+    print("#########")
+    ret='\n'+ret
+    return(ret)
+
 def prepare_zpools():
     print("Preparing zfs filesystems...")
 
diff --git a/run_tests b/run_tests
index 71a77a5..701aabf 100755
--- a/run_tests
+++ b/run_tests
@@ -1,3 +1,6 @@
 #!/bin/bash
-coverage run --source bin.zfs_autobackup -m unittest -v $@; coverage report
+coverage run --source bin.zfs_autobackup -m unittest -v $@
+
+echo 
+coverage report
 
diff --git a/test_zfsnode.py b/test_zfsnode.py
index 9f1adee..a91d95c 100644
--- a/test_zfsnode.py
+++ b/test_zfsnode.py
@@ -13,13 +13,63 @@ class TestZfsNode(unittest.TestCase):
         description="[Source]"
         node=ZfsNode("test", logger, description=description)
 
-        with self.subTest("### no changes, no snapshot"):
-            node.consistent_snapshot(node.selected_datasets, "snap1", 100000)
-            s=pformat(subprocess.check_call("zfs list -r -t all" , shell=True))
-            print(s)
+        with self.subTest("first snapshot"):
+            node.consistent_snapshot(node.selected_datasets, "test-1",100000)
+            r=shelltest("zfs list -H -o name -r -t all")
+            self.assertEqual(r,"""
+test_source1
+test_source1/fs1
+test_source1/fs1@test-1
+test_source1/fs1/sub
+test_source1/fs1/sub@test-1
+test_source2
+test_source2/fs2
+test_source2/fs2/sub
+test_source2/fs2/sub@test-1
+test_source2/fs3
+test_source2/fs3/sub
+test_target1
+""")
 
 
+        with self.subTest("second snapshot, no changes, no snapshot"):
+            node.consistent_snapshot(node.selected_datasets, "test-2",100000)
+            r=shelltest("zfs list -H -o name -r -t all")
+            self.assertEqual(r,"""
+test_source1
+test_source1/fs1
+test_source1/fs1@test-1
+test_source1/fs1/sub
+test_source1/fs1/sub@test-1
+test_source2
+test_source2/fs2
+test_source2/fs2/sub
+test_source2/fs2/sub@test-1
+test_source2/fs3
+test_source2/fs3/sub
+test_target1
+""")
 
+        with self.subTest("second snapshot, no changes, empty snapshot"):
+            node.consistent_snapshot(node.selected_datasets, "test-2",0)
+            r=shelltest("zfs list -H -o name -r -t all")
+            self.assertEqual(r,"""
+test_source1
+test_source1/fs1
+test_source1/fs1@test-1
+test_source1/fs1@test-2
+test_source1/fs1/sub
+test_source1/fs1/sub@test-1
+test_source1/fs1/sub@test-2
+test_source2
+test_source2/fs2
+test_source2/fs2/sub
+test_source2/fs2/sub@test-1
+test_source2/fs2/sub@test-2
+test_source2/fs3
+test_source2/fs3/sub
+test_target1
+""")
 
 
     def test_getselected(self):