Unit test tab (buffer) completion.

This involved adding a few stubs as well as expanding the FakeWebView.

tests/helpers/fixtures.py

@@ -234,6 +234,24 @@ def session_manager_stub(stubs):
     objreg.delete('session-manager')
 
 
+@pytest.yield_fixture
+def tabbed_browser_stub(stubs):
+    """Fixture which provides a fake tabbed-browser object."""
+    stub = stubs.TabbedBrowserStub()
+    objreg.register('tabbed-browser', stub, scope='window', window=0)
+    yield stub
+    objreg.delete('tabbed-browser', scope='window', window=0)
+
+
+@pytest.yield_fixture
+def app_stub(stubs):
+    """Fixture which provides a fake app object."""
+    stub = stubs.ApplicationStub()
+    objreg.register('app', stub)
+    yield stub
+    objreg.delete('app')
+
+
 @pytest.fixture(scope='session')
 def stubs():
     """Provide access to stub objects useful for testing."""

tests/helpers/stubs.py

@@ -31,6 +31,7 @@ from PyQt5.QtWidgets import QCommonStyle, QWidget
 
 from qutebrowser.browser.webkit import webview
 from qutebrowser.config import configexc
+from qutebrowser.mainwindow import mainwindow
 
 
 class FakeNetworkCache(QAbstractNetworkCache):
@@ -219,13 +220,20 @@ class FakeWebView(QWidget):
 
     """Fake WebView which can be added to a tab."""
 
-    def __init__(self):
+    url_text_changed = pyqtSignal(str)
+    shutting_down = pyqtSignal()
+
+    def __init__(self, url=FakeUrl(), title='', tab_id=0):
         super().__init__()
         self.progress = 0
         self.scroll_pos = (-1, -1)
         self.load_status = webview.LoadStatus.none
-        self.tab_id = 0
-        self.cur_url = FakeUrl()
+        self.tab_id = tab_id
+        self.cur_url = url
+        self.title = title
+
+    def url(self):
+        return self.cur_url
 
 
 class FakeSignal:
@@ -480,3 +488,34 @@ class SessionManagerStub:
 
     def list_sessions(self):
         return self.sessions
+
+
+class TabbedBrowserStub(QObject):
+
+    """Stub for the tabbed-browser object."""
+
+    new_tab = pyqtSignal(webview.WebView, int)
+
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        self.tabs = []
+        self.shutting_down = False
+
+    def count(self):
+        return len(self.tabs)
+
+    def widget(self, i):
+        return self.tabs[i]
+
+    def page_title(self, i):
+        return self.tabs[i].title
+
+
+class ApplicationStub(QObject):
+
+    """Stub to insert as the app object in objreg."""
+
+    new_window = pyqtSignal(mainwindow.MainWindow)
+
+    def __init__(self):
+        super().__init__()

tests/unit/completion/test_models.py

@@ -184,6 +184,23 @@ def test_session_completion(session_manager_stub):
     ]
 
 
+def test_tab_completion(stubs, qtbot, app_stub, win_registry,
+                        tabbed_browser_stub):
+    tabbed_browser_stub.tabs = [
+        stubs.FakeWebView(QUrl('https://github.com'), 'GitHub', 0),
+        stubs.FakeWebView(QUrl('https://wikipedia.org'), 'Wikipedia', 1),
+        stubs.FakeWebView(QUrl('https://duckduckgo.com'), 'DuckDuckGo', 2)
+    ]
+    actual = _get_completions(miscmodels.TabCompletionModel())
+    assert actual == [
+        ('0', [
+            ('0/1', 'https://github.com', 'GitHub'),
+            ('0/2', 'https://wikipedia.org', 'Wikipedia'),
+            ('0/3', 'https://duckduckgo.com', 'DuckDuckGo')
+        ])
+    ]
+
+
 def _get_completions(model):
     """Collect all the completion entries of a model, organized by category.