diff --git a/molecule/alternative/tests/test_minio_alternative.py b/molecule/alternative/tests/test_minio_alternative.py
index 4ad6e7b..457082e 100644
--- a/molecule/alternative/tests/test_minio_alternative.py
+++ b/molecule/alternative/tests/test_minio_alternative.py
@@ -10,7 +10,7 @@ testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
 
 @pytest.fixture()
 def AnsibleDefaults():
-    with open("../../defaults/main.yml", 'r') as stream:
+    with open('../../defaults/main.yml', 'r') as stream:
         return yaml.load(stream)
 
 
@@ -42,4 +42,4 @@ def test_minio_server_data_directories(host, AnsibleDefaults, minio_datadir):
 
 def test_minio_server_webserver(host):
 
-    host.socket("tcp://127.0.0.1:80").is_listening
+    host.socket('tcp://127.0.0.1:80').is_listening
diff --git a/molecule/cluster/tests/test_minio_cluster.py b/molecule/cluster/tests/test_minio_cluster.py
index 5775c5a..0e12a41 100644
--- a/molecule/cluster/tests/test_minio_cluster.py
+++ b/molecule/cluster/tests/test_minio_cluster.py
@@ -10,7 +10,7 @@ testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
 
 @pytest.fixture()
 def AnsibleDefaults():
-    with open("../../defaults/main.yml", 'r') as stream:
+    with open('../../defaults/main.yml', 'r') as stream:
         return yaml.load(stream)
 
 
diff --git a/molecule/default/tests/test_minio_default.py b/molecule/default/tests/test_minio_default.py
index 5f55c9e..a526d9d 100644
--- a/molecule/default/tests/test_minio_default.py
+++ b/molecule/default/tests/test_minio_default.py
@@ -10,7 +10,7 @@ testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
 
 @pytest.fixture()
 def AnsibleDefaults():
-    with open("../../defaults/main.yml", 'r') as stream:
+    with open('../../defaults/main.yml', 'r') as stream:
         return yaml.load(stream)
 
 
@@ -40,4 +40,4 @@ def test_minio_server_data_directories(host, AnsibleDefaults):
 
 def test_minio_server_webserver(host):
 
-    host.socket("tcp://127.0.0.1:9091").is_listening
+    host.socket('tcp://127.0.0.1:9091').is_listening