It only contains 4 functions (2 before 3.12). tty.setcbreak() is only used in pydoc (and this case seems is not tested), tty.setraw() is only used in pty and tests mock it. So, the tty module is not tested, neither directly, nor indirectly.

Linked PRs

• gh-110388: Add tests for tty #110394
• [3.12] gh-110388: Add tests for tty (GH-110394) #110621
• [3.11] gh-110388: Add tests for tty (GH-110394) #110622
• [3.11] gh-110388: Add tests for tty (GH-110394) #110634