Code cleanup, more tests

tests/test_markdown_editor.py

@@ -1,6 +1,7 @@
 import pytest
 
-from PySide6.QtGui import QImage, QColor
+from PySide6.QtCore import Qt, QPoint
+from PySide6.QtGui import QImage, QColor, QKeyEvent, QTextCursor
 from bouquin.markdown_editor import MarkdownEditor
 from bouquin.theme import ThemeManager, ThemeConfig, Theme
 
@@ -61,3 +62,84 @@ def test_apply_code_inline(editor):
     editor.apply_code()
     md = editor.to_markdown()
     assert ("`" in md) or ("```" in md)
+
+
+@pytest.mark.gui
+def test_auto_close_code_fence(editor, qtbot):
+    # Place caret at start and type exactly `` then ` to trigger expansion
+    editor.setPlainText("")
+    qtbot.keyClicks(editor, "``")
+    qtbot.keyClicks(editor, "`")  # third backtick triggers fence insertion
+    txt = editor.toPlainText()
+    assert "```" in txt and txt.count("```") >= 2
+
+
+@pytest.mark.gui
+def test_checkbox_toggle_by_click(editor, qtbot):
+    # Load a markdown checkbox
+    editor.from_markdown("- [ ] task here")
+    # Verify display token present
+    display = editor.toPlainText()
+    assert "☐" in display
+
+    # Click on the first character region to toggle
+    c = editor.textCursor()
+    from PySide6.QtGui import QTextCursor
+
+    c.movePosition(QTextCursor.StartOfBlock)
+    editor.setTextCursor(c)
+    r = editor.cursorRect()
+    center = r.center()
+    # Send click slightly right to land within checkbox icon region
+    pos = QPoint(r.left() + 2, center.y())
+    qtbot.mouseClick(editor.viewport(), Qt.LeftButton, pos=pos)
+
+    # Should have toggled to checked icon
+    display2 = editor.toPlainText()
+    assert "☑" in display2
+
+
+@pytest.mark.gui
+def test_apply_heading_levels(editor, qtbot):
+    editor.setPlainText("hello")
+    editor.selectAll()
+    # H2
+    editor.apply_heading(18)
+    assert editor.toPlainText().startswith("## ")
+    # H3
+    editor.selectAll()
+    editor.apply_heading(14)
+    assert editor.toPlainText().startswith("### ")
+    # Normal (no heading)
+    editor.selectAll()
+    editor.apply_heading(12)
+    assert not editor.toPlainText().startswith("#")
+
+
+@pytest.mark.gui
+def test_enter_on_nonempty_list_continues(qtbot, editor):
+    qtbot.addWidget(editor)
+    editor.show()
+    editor.from_markdown("- item")
+    c = editor.textCursor()
+    c.movePosition(QTextCursor.End)
+    editor.setTextCursor(c)
+
+    ev = QKeyEvent(QKeyEvent.KeyPress, Qt.Key_Return, Qt.NoModifier, "\n")
+    editor.keyPressEvent(ev)
+    txt = editor.toPlainText()
+    assert "\n- " in txt
+
+
+@pytest.mark.gui
+def test_enter_on_empty_list_marks_empty(qtbot, editor):
+    qtbot.addWidget(editor)
+    editor.show()
+    editor.from_markdown("- ")
+    c = editor.textCursor()
+    c.movePosition(QTextCursor.End)
+    editor.setTextCursor(c)
+
+    ev = QKeyEvent(QKeyEvent.KeyPress, Qt.Key_Return, Qt.NoModifier, "\n")
+    editor.keyPressEvent(ev)
+    assert editor.toPlainText().startswith("- \n")