diff --git a/Tests/t_bind.py b/Tests/t_bind.py
index 6e9a61c..3e2b67f 100644
--- a/Tests/t_bind.py
+++ b/Tests/t_bind.py
@@ -9,9 +9,15 @@
     PY2 = False
     text_type = str
 
-import ldap, unittest
-from slapdtest import SlapdTestCase
+import os
+import unittest
+
+# Switch off processing .ldaprc or ldap.conf before importing _ldap
+os.environ['LDAPNOINIT'] = '1'
+
+import ldap
 from ldap.ldapobject import LDAPObject
+from slapdtest import SlapdTestCase
 
 
 class TestBinds(SlapdTestCase):
diff --git a/Tests/t_cext.py b/Tests/t_cext.py
index d8233dc..af26706 100644
--- a/Tests/t_cext.py
+++ b/Tests/t_cext.py
@@ -10,13 +10,12 @@
 import os
 import unittest
 
-from slapdtest import SlapdTestCase, requires_tls
-
 # Switch off processing .ldaprc or ldap.conf before importing _ldap
 os.environ['LDAPNOINIT'] = '1'
 
 # import the plain C wrapper module
 import _ldap
+from slapdtest import SlapdTestCase, requires_tls
 
 
 class TestLdapCExtension(SlapdTestCase):
diff --git a/Tests/t_cidict.py b/Tests/t_cidict.py
index 00d0726..8e5d8d6 100644
--- a/Tests/t_cidict.py
+++ b/Tests/t_cidict.py
@@ -5,11 +5,13 @@
 See https://www.python-ldap.org/ for details.
 """
 
-# from Python's standard lib
+import os
 import unittest
 
-# from python-ldap
-import ldap, ldap.cidict
+# Switch off processing .ldaprc or ldap.conf before importing _ldap
+os.environ['LDAPNOINIT'] = '1'
+import ldap
+import ldap.cidict
 
 
 class TestCidict(unittest.TestCase):
diff --git a/Tests/t_edit.py b/Tests/t_edit.py
index 0012c9c..a5b3f65 100644
--- a/Tests/t_edit.py
+++ b/Tests/t_edit.py
@@ -9,10 +9,15 @@
     PY2 = False
     text_type = str
 
-import ldap, unittest
-from slapdtest import SlapdTestCase
+import os
+import unittest
+
+# Switch off processing .ldaprc or ldap.conf before importing _ldap
+os.environ['LDAPNOINIT'] = '1'
 
+import ldap
 from ldap.ldapobject import LDAPObject
+from slapdtest import SlapdTestCase
 
 
 class EditionTests(SlapdTestCase):
diff --git a/Tests/t_ldap_controls_libldap.py b/Tests/t_ldap_controls_libldap.py
index 229935e..d397861 100644
--- a/Tests/t_ldap_controls_libldap.py
+++ b/Tests/t_ldap_controls_libldap.py
@@ -4,7 +4,6 @@
 # Switch off processing .ldaprc or ldap.conf before importing _ldap
 os.environ['LDAPNOINIT'] = '1'
 
-import ldap
 from ldap.controls import pagedresults
 from ldap.controls import libldap
 
diff --git a/Tests/t_ldap_dn.py b/Tests/t_ldap_dn.py
index 459c1dc..4b4dd31 100644
--- a/Tests/t_ldap_dn.py
+++ b/Tests/t_ldap_dn.py
@@ -8,9 +8,11 @@
 from __future__ import unicode_literals
 
 # from Python's standard lib
+import os
 import unittest
 
-# from python-ldap
+# Switch off processing .ldaprc or ldap.conf before importing _ldap
+os.environ['LDAPNOINIT'] = '1'
 import ldap.dn
 
 
diff --git a/Tests/t_ldap_filter.py b/Tests/t_ldap_filter.py
index 5eda05d..da96446 100644
--- a/Tests/t_ldap_filter.py
+++ b/Tests/t_ldap_filter.py
@@ -5,10 +5,12 @@
 See https://www.python-ldap.org/ for details.
 """
 
-# from Python's standard lib
+import os
 import unittest
 
-# from python-ldap
+# Switch off processing .ldaprc or ldap.conf before importing _ldap
+os.environ['LDAPNOINIT'] = '1'
+
 from ldap.filter import escape_filter_chars
 
 
diff --git a/Tests/t_ldap_functions.py b/Tests/t_ldap_functions.py
index cdd2ffb..45931da 100644
--- a/Tests/t_ldap_functions.py
+++ b/Tests/t_ldap_functions.py
@@ -5,10 +5,12 @@
 See https://www.python-ldap.org/ for details.
 """
 
-# from Python's standard lib
+import os
 import unittest
 
-# from python-ldap
+# Switch off processing .ldaprc or ldap.conf before importing _ldap
+os.environ['LDAPNOINIT'] = '1'
+
 import ldap
 from ldap.dn import escape_dn_chars
 from ldap.filter import escape_filter_chars
diff --git a/Tests/t_ldap_modlist.py b/Tests/t_ldap_modlist.py
index a206cde..db248b7 100644
--- a/Tests/t_ldap_modlist.py
+++ b/Tests/t_ldap_modlist.py
@@ -5,12 +5,16 @@
 See https://www.python-ldap.org/ for details.
 """
 
+import os
 import unittest
 
-import ldap
+# Switch off processing .ldaprc or ldap.conf before importing _ldap
+os.environ['LDAPNOINIT'] = '1'
 
+import ldap
 from ldap.modlist import addModlist,modifyModlist
 
+
 class TestModlist(unittest.TestCase):
 
     addModlist_tests = [
diff --git a/Tests/t_ldap_options.py b/Tests/t_ldap_options.py
index a681a9b..ffc2451 100644
--- a/Tests/t_ldap_options.py
+++ b/Tests/t_ldap_options.py
@@ -4,12 +4,14 @@
 # Switch off processing .ldaprc or ldap.conf before importing _ldap
 os.environ['LDAPNOINIT'] = '1'
 
+from slapdtest import SlapdTestCase, requires_tls
+
 import ldap
 from ldap.controls import RequestControlTuples
 from ldap.controls.pagedresults import SimplePagedResultsControl
 from ldap.controls.openldap import SearchNoOpControl
 from ldap.ldapobject import SimpleLDAPObject
-from slapdtest import SlapdTestCase, requires_tls
+
 
 SENTINEL = object()
 
diff --git a/Tests/t_ldap_sasl.py b/Tests/t_ldap_sasl.py
index d104468..e60ac12 100644
--- a/Tests/t_ldap_sasl.py
+++ b/Tests/t_ldap_sasl.py
@@ -5,7 +5,6 @@
 See https://www.python-ldap.org/ for details.
 """
 import os
-import socket
 import unittest
 
 # Switch off processing .ldaprc or ldap.conf before importing _ldap
diff --git a/Tests/t_ldap_schema_tokenizer.py b/Tests/t_ldap_schema_tokenizer.py
index d676e8a..c858177 100644
--- a/Tests/t_ldap_schema_tokenizer.py
+++ b/Tests/t_ldap_schema_tokenizer.py
@@ -5,8 +5,12 @@
 See https://www.python-ldap.org/ for details.
 """
 
+import os
 import unittest
 
+# Switch off processing .ldaprc or ldap.conf before importing _ldap
+os.environ['LDAPNOINIT'] = '1'
+
 import ldap.schema
 
 # basic test cases
diff --git a/Tests/t_ldap_syncrepl.py b/Tests/t_ldap_syncrepl.py
index 71f240c..73ba1fb 100644
--- a/Tests/t_ldap_syncrepl.py
+++ b/Tests/t_ldap_syncrepl.py
@@ -16,8 +16,6 @@
 else:
     PY2 = False
 
-from slapdtest import SlapdObject, SlapdTestCase
-
 # Switch off processing .ldaprc or ldap.conf before importing _ldap
 os.environ['LDAPNOINIT'] = '1'
 
@@ -25,6 +23,8 @@
 from ldap.ldapobject import SimpleLDAPObject
 from ldap.syncrepl import SyncreplConsumer
 
+from slapdtest import SlapdObject, SlapdTestCase
+
 # a template string for generating simple slapd.conf file
 SLAPD_CONF_PROVIDER_TEMPLATE = r"""
 serverID %(serverid)s
diff --git a/Tests/t_ldapobject.py b/Tests/t_ldapobject.py
index 2c8ce75..b57ecf1 100644
--- a/Tests/t_ldapobject.py
+++ b/Tests/t_ldapobject.py
@@ -22,8 +22,6 @@
 import unittest
 import warnings
 import pickle
-from slapdtest import SlapdTestCase
-from slapdtest import requires_ldapi, requires_sasl, requires_tls
 
 # Switch off processing .ldaprc or ldap.conf before importing _ldap
 os.environ['LDAPNOINIT'] = '1'
@@ -31,6 +29,10 @@
 import ldap
 from ldap.ldapobject import SimpleLDAPObject, ReconnectLDAPObject
 
+from slapdtest import SlapdTestCase
+from slapdtest import requires_ldapi, requires_sasl, requires_tls
+
+
 LDIF_TEMPLATE = """dn: %(suffix)s
 objectClass: dcObject
 objectClass: organization
diff --git a/Tests/t_ldapurl.py b/Tests/t_ldapurl.py
index 2be03f6..c4a813d 100644
--- a/Tests/t_ldapurl.py
+++ b/Tests/t_ldapurl.py
@@ -7,7 +7,12 @@
 
 from __future__ import unicode_literals
 
+import os
 import unittest
+
+# Switch off processing .ldaprc or ldap.conf before importing _ldap
+os.environ['LDAPNOINIT'] = '1'
+
 from ldap.compat import quote
 
 import ldapurl
diff --git a/Tests/t_ldif.py b/Tests/t_ldif.py
index adf0d26..4f181df 100644
--- a/Tests/t_ldif.py
+++ b/Tests/t_ldif.py
@@ -7,16 +7,18 @@
 
 from __future__ import unicode_literals
 
-# from Python's standard lib
-import unittest
+import os
 import textwrap
+import unittest
 
 try:
     from StringIO import StringIO
 except ImportError:
     from io import StringIO
 
-# from python-ldap
+# Switch off processing .ldaprc or ldap.conf before importing _ldap
+os.environ['LDAPNOINIT'] = '1'
+
 import ldif
 
 
diff --git a/Tests/t_untested_mods.py b/Tests/t_untested_mods.py
index 7f0f30d..5e726a6 100644
--- a/Tests/t_untested_mods.py
+++ b/Tests/t_untested_mods.py
@@ -1,5 +1,10 @@
 # modules without any tests
 
+import os
+
+# Switch off processing .ldaprc or ldap.conf before importing _ldap
+os.environ['LDAPNOINIT'] = '1'
+
 import ldap.controls.deref
 import ldap.controls.openldap
 import ldap.controls.ppolicy