Add test coverage

tests/test_core/test_core_tohtml.py

@@ -308,6 +308,42 @@ def testCoreToHtml_ConvertParagraphs(mockGUI):
     )
 
 
+@pytest.mark.core
+def testCoreToHtml_CloseTags(mockGUI):
+    """Test automatic closing of HTML tags for shortcodes."""
+    project = NWProject()
+    html = ToHtml(project)
+
+    html._isNovel = True
+    html._isFirst = True
+
+    # Unclosed Shortcodes
+    html._text = "Text [b][i][s][u][m][sup][sub]text text text.\n"
+    html.tokenizeText()
+    html.doConvert()
+    assert html.result == (
+        "<p>Text <strong><em><del><span style='text-decoration: underline;'><mark><sup><sub>"
+        "text text text.</strong></em></del></span></mark></sup></sub></p>\n"
+    )
+
+    # Double Shortcodes
+    html._text = "Text [b][i][s][u][m][sup][sub]text [b][i][s][u][m][sup][sub]text text.\n"
+    html.tokenizeText()
+    html.doConvert()
+    assert html.result == (
+        "<p>Text <strong><em><del><span style='text-decoration: underline;'><mark><sup><sub>"
+        "text text text.</strong></em></del></span></mark></sup></sub></p>\n"
+    )
+
+    # Redundant Close Shortcodes
+    html._text = "Text text [/b][/i][/s][/u][/m][/sup][/sub]text text.\n"
+    html.tokenizeText()
+    html.doConvert()
+    assert html.result == (
+        "<p>Text text text text.</p>\n"
+    )
+
+
 @pytest.mark.core
 def testCoreToHtml_ConvertDirect(mockGUI):
     """Test the converter directly using the ToHtml class."""