Document handling

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

tests/unit/test_gui_document.py

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+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+from PySide6.QtGui import QUndoCommand
+
+from bedit_gui.documents import Document
+
+
+@pytest.mark.unit
+@pytest.mark.parametrize("suffix", [".beb", ".json"])
+def test_document_save_and_open(tmp_path: Path, suffix: str) -> None:
+    path = tmp_path / f"document{suffix}"
+    document = Document()
+    original_id = document.model.id
+
+    document.save_as(path)
+    document.new()
+    assert document.model.id != original_id
+
+    document.open(path)
+
+    assert document.model.id == original_id
+    assert document.path == path
+    assert not document.modified
+
+
+@pytest.mark.unit
+def test_document_modified_state_uses_undo_stack() -> None:
+    document = Document()
+
+    document.undo_stack.push(QUndoCommand("change"))
+    assert document.modified
+
+    document.undo_stack.setClean()
+    assert not document.modified