Tests: pathlib used where appropriate

Also fixed various pylint errors and style issues.

3 files changed, 7 insertions, 9 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}'