diff --git a/src/app.py b/src/app.py
index 59fcb0d..f5b8fbc 100644
--- a/src/app.py
+++ b/src/app.py
@@ -26,7 +26,7 @@ def get_or_raise(env: str) -> str:
     return env_value
 
 
-def str_to_bool(str: str) -> bool:
+def convert_str_to_bool(str: str) -> bool:
     """
     Convert string to boolean.
 
@@ -101,7 +101,7 @@ def appium_run(avd_name: str):
     """
     cmd = 'appium'
 
-    grid_connect = str_to_bool(str(os.getenv('CONNECT_TO_GRID', False)))
+    grid_connect = convert_str_to_bool(str(os.getenv('CONNECT_TO_GRID', False)))
     logger.info('Connect to selenium grid? {connect}'.format(connect=grid_connect))
     if grid_connect:
         try:
@@ -170,7 +170,7 @@ def run():
     cmd = 'emulator -avd {name}'.format(name=avd_name)
     subprocess.Popen(cmd.split())
 
-    appium = str_to_bool(str(os.getenv('APPIUM', False)))
+    appium = convert_str_to_bool(str(os.getenv('APPIUM', False)))
     if appium:
         logger.info('Run appium server...')
         appium_run(avd_name)
diff --git a/src/tests/__init__.py b/src/tests/__init__.py
index 65cd5a4..93c555e 100644
--- a/src/tests/__init__.py
+++ b/src/tests/__init__.py
@@ -21,17 +21,17 @@ class TestApp(TestCase):
             app.get_or_raise('ENV_2')
 
     def test_valid_bool(self):
-        self.assertEqual(app.str_to_bool('True'), True)
-        self.assertEqual(app.str_to_bool('t'), True)
-        self.assertEqual(app.str_to_bool('1'), True)
-        self.assertEqual(app.str_to_bool('YES'), True)
+        self.assertEqual(app.convert_str_to_bool('True'), True)
+        self.assertEqual(app.convert_str_to_bool('t'), True)
+        self.assertEqual(app.convert_str_to_bool('1'), True)
+        self.assertEqual(app.convert_str_to_bool('YES'), True)
 
     def test_invalid_bool(self):
-        self.assertEqual(app.str_to_bool(''), False)
-        self.assertEqual(app.str_to_bool('test'), False)
+        self.assertEqual(app.convert_str_to_bool(''), False)
+        self.assertEqual(app.convert_str_to_bool('test'), False)
 
     def test_invalid_format(self):
-        self.assertEqual(app.str_to_bool(True), None)
+        self.assertEqual(app.convert_str_to_bool(True), None)
 
     @mock.patch('src.app.prepare_avd')
     @mock.patch('subprocess.Popen')