diff --git a/.gitignore b/.gitignore
index 0786884..723d68a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@ __pycache__
 python2.env
 venv
 .idea
+password.sh
diff --git a/requirements.txt b/requirements.txt
index 850f7d6..2319de0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 colorama
 argparse
-coverage==4.5.4
+coverage
 python-coveralls
 unittest2
 mock
diff --git a/tests/basetest.py b/tests/basetest.py
index 6305193..acb5f43 100644
--- a/tests/basetest.py
+++ b/tests/basetest.py
@@ -58,7 +58,8 @@ def redirect_stderr(target):
 
 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'))
+
+    ret=(subprocess.check_output("SUDO_ASKPASS=./password.sh sudo -A "+cmd , shell=True).decode('utf-8'))
     print("######### result of: {}".format(cmd))
     print(ret)
     print("#########")
diff --git a/tests/test_zfsautobackup.py b/tests/test_zfsautobackup.py
index ea196b3..9a0354b 100644
--- a/tests/test_zfsautobackup.py
+++ b/tests/test_zfsautobackup.py
@@ -2,7 +2,6 @@ from basetest import *
 import time
 
 
-
 class TestZfsAutobackup(unittest2.TestCase):
 
     def setUp(self):
@@ -696,8 +695,8 @@ test_target1
 
 
         #test incremental
-        with patch('time.strftime', return_value="20101111000000"):
-            self.assertFalse(ZfsAutobackup("test test_target1 --no-progress --verbose --test".split(" ")).run())
+        with patch('time.strftime', return_value="20101111000002"):
+            self.assertFalse(ZfsAutobackup("test test_target1 --no-progress --allow-empty --verbose --test".split(" ")).run())
 
         r=shelltest("zfs list -H -o name -r -t all "+TEST_POOLS)
         self.assertMultiLineEqual(r,"""
diff --git a/zfs_autobackup/ThinnerRule.py b/zfs_autobackup/ThinnerRule.py
index 5351766..0bb1425 100644
--- a/zfs_autobackup/ThinnerRule.py
+++ b/zfs_autobackup/ThinnerRule.py
@@ -42,7 +42,6 @@ class ThinnerRule:
         if '' in matches:
             raise (Exception("Invalid schedule string: '{}'".format(rule_str)))
 
-        print(matches)
         period_amount = int(matches[0])
         period_unit = matches[1]
         ttl_amount = int(matches[2])