Document handling

New/Open/Save/Save as and Undo/Redo

tests/unit/test_document_controller.py

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+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+from PySide6.QtGui import QUndoCommand
+from PySide6.QtWidgets import QApplication
+
+from bedit_gui.controllers.document_controller import DocumentController
+from bedit_gui.documents import Document
+from bedit_gui.views.dialogs.document_dialogs import SaveChangesChoice
+from bedit_gui.views.main_window import MainWindow
+
+
+class FakeDialogs:
+    def __init__(self) -> None:
+        self.open_path: Path | None = None
+        self.save_path: Path | None = None
+        self.save_choice = SaveChangesChoice.CANCEL
+        self.errors: list[tuple[str, Exception]] = []
+
+    def choose_open_path(self, _current_path: Path | None) -> Path | None:
+        return self.open_path
+
+    def choose_save_path(self, _current_path: Path | None) -> Path | None:
+        return self.save_path
+
+    def ask_save_changes(self) -> SaveChangesChoice:
+        return self.save_choice
+
+    def show_file_error(self, title: str, error: Exception) -> None:
+        self.errors.append((title, error))
+
+
+@pytest.fixture(scope="module")
+def qt_app() -> QApplication:
+    return QApplication.instance() or QApplication([])
+
+
+@pytest.mark.unit
+def test_new_document_respects_unsaved_changes(qt_app: QApplication) -> None:
+    document = Document(qt_app)
+    window = MainWindow()
+    dialogs = FakeDialogs()
+    controller = DocumentController(document, window, dialogs)
+    original_id = document.model.id
+    document.undo_stack.push(QUndoCommand("change"))
+
+    controller.new_document()
+    assert document.model.id == original_id
+
+    dialogs.save_choice = SaveChangesChoice.DISCARD
+    controller.new_document()
+    assert document.model.id != original_id
+    assert not document.modified
+
+
+@pytest.mark.unit
+def test_save_as_then_open_document(
+    qt_app: QApplication,
+    tmp_path: Path,
+) -> None:
+    document = Document(qt_app)
+    window = MainWindow()
+    dialogs = FakeDialogs()
+    controller = DocumentController(document, window, dialogs)
+    original_id = document.model.id
+    path = tmp_path / "document.json"
+
+    dialogs.save_path = path
+    assert controller.save_document_as()
+
+    document.new()
+    dialogs.open_path = path
+    controller.open_document()
+
+    assert document.model.id == original_id
+    assert document.path == path
+    assert not dialogs.errors