Adjust tests to match current completion item labels and clean up formatting:
- Expect "nocomplain" (no leading dash) for the unset option case instead of {"-nocomplain", "--"}.
- Reflow several multi-line source literals into single-line/f-string forms.
- Normalize various assertions and generator expressions onto single lines.
- Reformat TextDocumentItem construction for readability.
These changes are limited to test code and reflect the updated shape/labels of completion items and stylistic cleanup; no production logic is modified.
Christoph
0a8e8a7368