diff --git a/src/tests/bench.py b/src/tests/bench.py
index 9843e7b..62c3bd3 100644
--- a/src/tests/bench.py
+++ b/src/tests/bench.py
@@ -1,30 +1,33 @@
 #!/usr/bin/env python
 # coding: utf-8
 
+import time
+
 import cchardet
 import chardet
 
 
-class TestCchardetSpeed():
-    def test_speed(self):
-        import time
-        do_times = 5
-        path = r'tests/testdata/wikipediaJa_One_Thousand_and_One_Nights_SJIS.txt'
-        with open(path, 'rb') as f:
-            msg = f.read()
+def main():
+    do_times = 100
+    path = r'tests/testdata/wikipediaJa_One_Thousand_and_One_Nights_SJIS.txt'
+    with open(path, 'rb') as f:
+        msg = f.read()
 
-            # Test chardet
-            result_chardet = 0
-            for i in range(do_times):
-                start_chardet = time.time()
-                chardet.detect(msg)
-                result_chardet += (time.time() - start_chardet)
-            print('chardet:', 1 / (result_chardet / do_times), 'call(s)/s')
+        # Test chardet
+        result_chardet = 0
+        for i in range(do_times):
+            start_chardet = time.time()
+            chardet.detect(msg)
+            result_chardet += (time.time() - start_chardet)
+        print('chardet:', 1 / (result_chardet / do_times), 'call(s)/s')
 
-            # Test cchardet
-            result_cchardet = 0
-            for i in range(do_times):
-                start_cchardet = time.time()
-                cchardet.detect(msg)
-                result_cchardet += (time.time() - start_cchardet)
-            print('cchardet:', 1 / (result_cchardet / do_times), 'call(s)/s')
+        # Test cchardet
+        result_cchardet = 0
+        for i in range(do_times):
+            start_cchardet = time.time()
+            cchardet.detect(msg)
+            result_cchardet += (time.time() - start_cchardet)
+        print('cchardet:', 1 / (result_cchardet / do_times), 'call(s)/s')
+
+if __name__ == '__main__':
+    main()