Tests: switched to using f-strings.

Previously, it was necessary to support older versions of Python for
compatibility.  F-strings were released in Python 3.6.  Python 3.5 was
marked as unsupported by the end of 2020, so now it's possible to start
using f-strings safely for better readability and performance.

4 files changed, 18 insertions, 18 deletions

diff --git a/test/unit/check/chroot.py b/test/unit/check/chroot.py
index 40b75058..1b7aae90 100644
--- a/test/unit/check/chroot.py
+++ b/test/unit/check/chroot.py
@@ -12,7 +12,7 @@ def check_chroot():
     resp = http.put(
         url='/config',
         sock_type='unix',
-        addr=option.temp_dir + '/control.unit.sock',
+        addr=f'{option.temp_dir}/control.unit.sock',
         body=json.dumps(
             {
                 "listeners": {"*:7080": {"pass": "routes"}},
diff --git a/test/unit/check/isolation.py b/test/unit/check/isolation.py
index 9bd835a3..4ebce893 100644
--- a/test/unit/check/isolation.py
+++ b/test/unit/check/isolation.py
@@ -27,8 +27,8 @@ def check_isolation():
                 "empty": {
                     "type": "external",
                     "processes": {"spare": 0},
-                    "working_directory": option.test_dir + "/go/empty",
-                    "executable": option.temp_dir + "/go/app",
+                    "working_directory": f"{option.test_dir}/go/empty",
+                    "executable": f"{option.test_dir}/go/app",
                     "isolation": {"namespaces": {"credential": True}},
                 },
             },
@@ -41,8 +41,8 @@ def check_isolation():
                 "empty": {
                     "type": "python",
                     "processes": {"spare": 0},
-                    "path": option.test_dir + "/python/empty",
-                    "working_directory": option.test_dir + "/python/empty",
+                    "path": f"{option.test_dir}/python/empty",
+                    "working_directory": f"{option.test_dir}/python/empty",
                     "module": "wsgi",
                     "isolation": {"namespaces": {"credential": True}},
                 }
@@ -56,8 +56,8 @@ def check_isolation():
                 "phpinfo": {
                     "type": "php",
                     "processes": {"spare": 0},
-                    "root": option.test_dir + "/php/phpinfo",
-                    "working_directory": option.test_dir + "/php/phpinfo",
+                    "root": f"{option.test_dir}/php/phpinfo",
+                    "working_directory": f"{option.test_dir}/php/phpinfo",
                     "index": "index.php",
                     "isolation": {"namespaces": {"credential": True}},
                 }
@@ -73,8 +73,8 @@ def check_isolation():
                 "empty": {
                     "type": "ruby",
                     "processes": {"spare": 0},
-                    "working_directory": option.temp_dir + "/ruby/empty",
-                    "script": option.temp_dir + "/ruby/empty/config.ru",
+                    "working_directory": f"{option.temp_dir}/ruby/empty",
+                    "script": f"{option.temp_dir}/ruby/empty/config.ru",
                     "isolation": {"namespaces": {"credential": True}},
                 }
             },
@@ -87,11 +87,11 @@ def check_isolation():
             "listeners": {"*:7080": {"pass": "applications/empty"}},
             "applications": {
                 "empty": {
-                    "unit_jars": option.current_dir + "/build",
+                    "unit_jars": f"{option.current_dir}/build",
                     "type": "java",
                     "processes": {"spare": 0},
-                    "working_directory": option.test_dir + "/java/empty/",
-                    "webapp": option.temp_dir + "/java",
+                    "working_directory": f"{option.temp_dir}/java/empty/",
+                    "webapp": f"{option.temp_dir}/java",
                     "isolation": {"namespaces": {"credential": True}},
                 }
             },
@@ -106,7 +106,7 @@ def check_isolation():
                 "basic": {
                     "type": "external",
                     "processes": {"spare": 0},
-                    "working_directory": option.temp_dir + "/node",
+                    "working_directory": f"{option.temp_dir}/node",
                     "executable": "app.js",
                     "isolation": {"namespaces": {"credential": True}},
                 }
@@ -120,8 +120,8 @@ def check_isolation():
                 "body_empty": {
                     "type": "perl",
                     "processes": {"spare": 0},
-                    "working_directory": option.test_dir + "/perl/body_empty",
-                    "script": option.test_dir + "/perl/body_empty/psgi.pl",
+                    "working_directory": f"{option.test_dir}/perl/body_empty",
+                    "script": f"{option.test_dir}/perl/body_empty/psgi.pl",
                     "isolation": {"namespaces": {"credential": True}},
                 }
             },
@@ -133,7 +133,7 @@ def check_isolation():
     resp = http.put(
         url='/config',
         sock_type='unix',
-        addr=option.temp_dir + '/control.unit.sock',
+        addr=f'{option.temp_dir}/control.unit.sock',
         body=json.dumps(conf),
     )
 
diff --git a/test/unit/check/node.py b/test/unit/check/node.py
index e053a749..dd59e7a4 100644
--- a/test/unit/check/node.py
+++ b/test/unit/check/node.py
@@ -3,7 +3,7 @@ import subprocess
 
 
 def check_node(current_dir):
-    if not os.path.exists(current_dir + '/node/node_modules'):
+    if not os.path.exists(f'{current_dir}/node/node_modules'):
         return None
 
     try:
diff --git a/test/unit/check/unix_abstract.py b/test/unit/check/unix_abstract.py
index 5d1f629e..aadde43a 100644
--- a/test/unit/check/unix_abstract.py
+++ b/test/unit/check/unix_abstract.py
@@ -12,7 +12,7 @@ def check_unix_abstract():
     resp = http.put(
         url='/config',
         sock_type='unix',
-        addr=option.temp_dir + '/control.unit.sock',
+        addr=f'{option.temp_dir}/control.unit.sock',
         body=json.dumps(
             {
                 "listeners": {"unix:@sock": {"pass": "routes"}},