5 files changed, 15 insertions, 16 deletions
diff --git a/test/unit/applications/lang/go.py b/test/unit/applications/lang/go.py
index 5aca5048..2479d4f6 100644
--- a/test/unit/applications/lang/go.py
+++ b/test/unit/applications/lang/go.py
@@ -53,7 +53,7 @@ class ApplicationGo(ApplicationProto):
 
         replace_path = f'{option.current_dir}/build/go/src/unit.nginx.org/go'
 
-        with open(f'{temp_dir}go.mod', 'w') as f:
+        with open(f'{temp_dir}go.mod', 'w', encoding='utf-8') as f:
             f.write(
                 f"""module test/app
 require unit.nginx.org/go v0.0.0
diff --git a/test/unit/applications/lang/php.py b/test/unit/applications/lang/php.py
index 2ab172b0..ac59ec1b 100644
--- a/test/unit/applications/lang/php.py
+++ b/test/unit/applications/lang/php.py
@@ -1,4 +1,4 @@
-import os
+from pathlib import Path
 import shutil
 
 from unit.applications.proto import ApplicationProto
@@ -15,10 +15,9 @@ class ApplicationPHP(ApplicationProto):
         if kwargs.get('isolation') and kwargs['isolation'].get('rootfs'):
             rootfs = kwargs['isolation']['rootfs']
 
-            if not os.path.exists(f'{rootfs}/app/php/'):
-                os.makedirs(f'{rootfs}/app/php/')
+            Path(f'{rootfs}/app/php/').mkdir(parents=True, exist_ok=True)
 
-            if not os.path.exists(f'{rootfs}/app/php/{script}'):
+            if not Path(f'{rootfs}/app/php/{script}').exists():
                 shutil.copytree(script_path, f'{rootfs}/app/php/{script}')
 
             script_path = f'/app/php/{script}'
diff --git a/test/unit/applications/lang/python.py b/test/unit/applications/lang/python.py
index 67304d12..67684b04 100644
--- a/test/unit/applications/lang/python.py
+++ b/test/unit/applications/lang/python.py
@@ -1,4 +1,4 @@
-import os
+from pathlib import Path
 import shutil
 from urllib.parse import quote
 
@@ -26,10 +26,9 @@ class ApplicationPython(ApplicationProto):
         if kwargs.get('isolation') and kwargs['isolation'].get('rootfs'):
             rootfs = kwargs['isolation']['rootfs']
 
-            if not os.path.exists(f'{rootfs}/app/python/'):
-                os.makedirs(f'{rootfs}/app/python/')
+            Path(f'{rootfs}/app/python/').mkdir(parents=True, exist_ok=True)
 
-            if not os.path.exists(f'{rootfs}/app/python/{name}'):
+            if not Path(f'{rootfs}/app/python/{name}').exists():
                 shutil.copytree(script_path, f'{rootfs}/app/python/{name}')
 
             script_path = f'/app/python/{name}'
diff --git a/test/unit/applications/tls.py b/test/unit/applications/tls.py
index 50a27348..75354dd9 100644
--- a/test/unit/applications/tls.py
+++ b/test/unit/applications/tls.py
@@ -79,7 +79,7 @@ subjectAltName = @alt_names
 
 {a_names}'''
 
-        with open(conf_path, 'w') as f:
+        with open(conf_path, 'w', encoding='utf-8') as f:
             f.write(
                 f'''[ req ]
 default_bits = 2048
diff --git a/test/unit/applications/websockets.py b/test/unit/applications/websockets.py
index 29725943..a8e563d0 100644
--- a/test/unit/applications/websockets.py
+++ b/test/unit/applications/websockets.py
@@ -6,6 +6,7 @@ import select
 import struct
 
 import pytest
+
 from unit.applications.proto import ApplicationProto
 
 GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
@@ -69,7 +70,7 @@ class ApplicationWebsocket(ApplicationProto):
         return struct.pack('!H', code) + reason.encode('utf-8')
 
     def frame_read(self, sock, read_timeout=60):
-        def recv_bytes(sock, bytes):
+        def recv_bytes(sock, bytes_len):
             data = b''
             while True:
                 rlist = select.select([sock], [], [], read_timeout)[0]
@@ -80,9 +81,9 @@ class ApplicationWebsocket(ApplicationProto):
                         pytest.fail("Can't read response from server.")
                     break
 
-                data += sock.recv(bytes - len(data))
+                data += sock.recv(bytes_len - len(data))
 
-                if len(data) == bytes:
+                if len(data) == bytes_len:
                     break
 
             return data
@@ -206,18 +207,18 @@ class ApplicationWebsocket(ApplicationProto):
                     end = frame_len
                 pos = end
 
-    def message(self, sock, type, message, fragmention_size=None, **kwargs):
+    def message(self, sock, mes_type, message, fragmention_size=None, **kwargs):
         message_len = len(message)
 
         if fragmention_size is None:
             fragmention_size = message_len
 
         if message_len <= fragmention_size:
-            self.frame_write(sock, type, message, **kwargs)
+            self.frame_write(sock, mes_type, message, **kwargs)
             return
 
         pos = 0
-        op_code = type
+        op_code = mes_type
         while pos < message_len:
             end = min(pos + fragmention_size, message_len)
             fin = end == message_len