Various tweaks to theme, more code coverage

tests/test_history_dialog_unit.py

@@ -0,0 +1,66 @@
+from PySide6.QtWidgets import QListWidgetItem
+from PySide6.QtCore import Qt
+from bouquin.history_dialog import HistoryDialog
+
+
+class FakeDB:
+    def __init__(self):
+        self.fail_revert = False
+
+    def list_versions(self, date_iso):
+        # Simulate two versions; mark second as current
+        return [
+            {
+                "id": 1,
+                "version_no": 1,
+                "created_at": "2025-01-01T10:00:00Z",
+                "note": None,
+                "is_current": False,
+                "content": "<p>a</p>",
+            },
+            {
+                "id": 2,
+                "version_no": 2,
+                "created_at": "2025-01-02T10:00:00Z",
+                "note": None,
+                "is_current": True,
+                "content": "<p>b</p>",
+            },
+        ]
+
+    def get_version(self, version_id):
+        if version_id == 2:
+            return {"content": "<p>b</p>"}
+        return {"content": "<p>a</p>"}
+
+    def revert_to_version(self, date, version_id=None, version_no=None):
+        if self.fail_revert:
+            raise RuntimeError("boom")
+
+
+def test_on_select_no_item(qtbot):
+    dlg = HistoryDialog(FakeDB(), "2025-01-01")
+    qtbot.addWidget(dlg)
+    dlg.list.clear()
+    dlg._on_select()
+
+
+def test_revert_failure_shows_critical(qtbot, monkeypatch):
+    from PySide6.QtWidgets import QMessageBox
+
+    fake = FakeDB()
+    fake.fail_revert = True
+    dlg = HistoryDialog(fake, "2025-01-01")
+    qtbot.addWidget(dlg)
+    item = QListWidgetItem("v1")
+    item.setData(Qt.UserRole, 1)  # different from current 2
+    dlg.list.addItem(item)
+    dlg.list.setCurrentItem(item)
+    msgs = {}
+
+    def fake_crit(parent, title, text):
+        msgs["t"] = (title, text)
+
+    monkeypatch.setattr(QMessageBox, "critical", staticmethod(fake_crit))
+    dlg._revert()
+    assert "Revert failed" in msgs["t"][0]