...

setup/test.py

@@ -109,6 +109,9 @@ def find_tests(which_tests=None, exclude_tests=None):
     if ok('matcher'):
         from calibre.utils.matcher import test
         a(test(return_tests=True))
+    if ok('scraper'):
+        from calibre.scraper.simple import find_tests
+        a(find_tests())
     if ok('icu'):
         from calibre.utils.icu_test import find_tests
         a(find_tests())

src/calibre/scraper/simple.py

@@ -123,6 +123,17 @@ class SimpleScraper(QWebEnginePage):
             del self.current_fetch
 
 
+def find_tests():
+    import unittest
+
+    class TestSimpleWebEngineScraper(unittest.TestCase):
+
+        def test_dom_load(self):
+            return
+
+    return unittest.defaultTestLoader.loadTestsFromTestCase(TestSimpleWebEngineScraper)
+
+
 if __name__ == '__main__':
     app = QApplication([])
     s = SimpleScraper('test')