diff --git a/src/saml2/s_utils.py b/src/saml2/s_utils.py
index 47f47c9..5bf3a69 100644
--- a/src/saml2/s_utils.py
+++ b/src/saml2/s_utils.py
@@ -1,7 +1,6 @@
 #!/usr/bin/env python
 import logging
 import random
-import string
 
 import time
 import base64
diff --git a/tests/test_10_time_util.py b/tests/test_10_time_util.py
index 323126d..3555829 100644
--- a/tests/test_10_time_util.py
+++ b/tests/test_10_time_util.py
@@ -140,7 +140,7 @@ def test_valid():
     assert valid("%d-01-12T00:00:00Z" % (current_year + 1)) == True
     this_instance = instant()
     time.sleep(1)
-    assert valid(this_instance) == False  # unless on a very fast machine :-)
+    assert valid(this_instance) is False  # unless on a very fast machine :-)
     soon = in_a_while(seconds=10)
     assert valid(soon) == True
 
@@ -176,4 +176,4 @@ def test_not_on_or_after():
 
 
 if __name__ == "__main__":
-    test_parse_duration_n()
+    test_str_to_time()
diff --git a/tests/test_50_server.py b/tests/test_50_server.py
index 4f3c414..0014a90 100644
--- a/tests/test_50_server.py
+++ b/tests/test_50_server.py
@@ -73,8 +73,8 @@ def generate_cert():
         "organization_unit": "DIRG"
     }
     osw = OpenSSLWrapper()
-    ca_cert_str = osw.read_str_from_file("/Users/haho0032/Develop/root_cert/localhost.ca.crt")
-    ca_key_str = osw.read_str_from_file("/Users/haho0032/Develop/root_cert/localhost.ca.key")
+    ca_cert_str = osw.read_str_from_file("root_cert/localhost.ca.crt")
+    ca_key_str = osw.read_str_from_file("root_cert/localhost.ca.key")
     req_cert_str, req_key_str = osw.create_certificate(cert_info, request=True, sn=sn, key_length=2048)
     cert_str = osw.create_cert_signed_certificate(ca_cert_str, ca_key_str, req_cert_str)
     return cert_str, req_key_str