diff --git a/tests/unit/utils/test_urlutils.py b/tests/unit/utils/test_urlutils.py
index af0e62ed3..f5d8c9bdc 100644
--- a/tests/unit/utils/test_urlutils.py
+++ b/tests/unit/utils/test_urlutils.py
@@ -620,6 +620,32 @@ class TestIncDecNumber:
             base_url, incdec, segments={'host', 'path', 'query', 'anchor'})
         assert new_url == expected_url
 
+    @pytest.mark.parametrize('incdec', ['increment', 'decrement'])
+    @pytest.mark.parametrize('value', [
+        '{}foo', 'foo{}', 'foo{}bar', '42foo{}'
+    ])
+    @pytest.mark.parametrize('url', [
+        'http://example.com:80/v1/path/{}/test',
+        'http://example.com:80/v1/query_test?value={}',
+        'http://example.com:80/v1/anchor_test#{}',
+        'http://host_{}_test.com:80',
+        'http://m4ny.c0m:80/number5/3very?where=yes#{}'
+    ])
+    @pytest.mark.parametrize('count', [1, 5, 100])
+    def test_incdec_number_count(self, incdec, value, url, count):
+        """Test incdec_number with valid URLs and a count."""
+        base_value = value.format(20)
+        if incdec == 'increment':
+            expected_value = value.format(20 + count)
+        else:
+            expected_value = value.format(20 - count)
+
+        base_url = QUrl(url.format(base_value))
+        expected_url = QUrl(url.format(expected_value))
+        new_url = urlutils.incdec_number(
+            base_url, incdec, count, segments={'host', 'path', 'query', 'anchor'})
+        assert new_url == expected_url
+
     @pytest.mark.parametrize('number, expected, incdec', [
         ('01', '02', 'increment'),
         ('09', '10', 'increment'),