diff --git a/tests/helpers/fixtures.py b/tests/helpers/fixtures.py
index 09307711f..3434760ec 100644
--- a/tests/helpers/fixtures.py
+++ b/tests/helpers/fixtures.py
@@ -60,6 +60,9 @@ class WinRegistryHelper:
 
         registry = attr.ib()
 
+        def windowTitle(self):
+            return 'window title - qutebrowser'
+
     def __init__(self):
         self._ids = []
 
diff --git a/tests/helpers/stubs.py b/tests/helpers/stubs.py
index 15d2ce8a0..0a6df9b35 100644
--- a/tests/helpers/stubs.py
+++ b/tests/helpers/stubs.py
@@ -520,6 +520,9 @@ class TabbedBrowserStub(QObject):
     def count(self):
         return len(self.tabs)
 
+    def widgets(self):
+        return self.tabs
+
     def widget(self, i):
         return self.tabs[i]
 
diff --git a/tests/unit/completion/test_models.py b/tests/unit/completion/test_models.py
index 30241b1b3..80b3234a9 100644
--- a/tests/unit/completion/test_models.py
+++ b/tests/unit/completion/test_models.py
@@ -528,6 +528,30 @@ def test_tab_completion_delete(qtmodeltester, fake_web_tab, app_stub,
                       QUrl('https://duckduckgo.com')]
 
 
+def test_window_completion(qtmodeltester, fake_web_tab, tabbed_browser_stubs):
+    tabbed_browser_stubs[0].tabs = [
+        fake_web_tab(QUrl('https://github.com'), 'GitHub', 0),
+        fake_web_tab(QUrl('https://wikipedia.org'), 'Wikipedia', 1),
+        fake_web_tab(QUrl('https://duckduckgo.com'), 'DuckDuckGo', 2)
+    ]
+    tabbed_browser_stubs[1].tabs = [
+        fake_web_tab(QUrl('https://wiki.archlinux.org'), 'ArchWiki', 0)
+    ]
+
+    model = miscmodels.window()
+    model.set_pattern('')
+    qtmodeltester.data_display_may_return_none = True
+    qtmodeltester.check(model)
+
+    _check_completions(model, {
+        'Windows': [
+            ('0', 'window title - qutebrowser',
+                'GitHub, Wikipedia, DuckDuckGo'),
+            ('1', 'window title - qutebrowser', 'ArchWiki')
+        ]
+    })
+
+
 def test_setting_option_completion(qtmodeltester, config_stub,
                                    configdata_stub, info):
     model = configmodel.option(info=info)