diff --git a/src/calibre/scraper/simple.py b/src/calibre/scraper/simple.py
index 72cfbcf068..8dcb423901 100644
--- a/src/calibre/scraper/simple.py
+++ b/src/calibre/scraper/simple.py
@@ -170,3 +170,7 @@ def find_tests():
             self.assertFalse(w)
 
     return unittest.defaultTestLoader.loadTestsFromTestCase(TestSimpleWebEngineScraper)
+
+
+if __name__ == '__main__':
+    print(read_url([], sys.argv[-1]))