fix(test): Fix doctest examples in random.py

why: The doctest examples were using line continuation with backslash followed by ellipsis which caused syntax errors during doctest execution.

what: Replace multiline examples with simpler single-line assertions and use intermediate variables to make the examples more readable

Author: tony

src/libtmux/test/random.py

@@ -79,8 +79,9 @@ def get_test_session_name(server: Server, prefix: str = TEST_SESSION_PREFIX) ->
     'libtmux_...'
 
     Never the same twice:
-    >>> get_test_session_name(server=server) != \
-    ...     get_test_session_name(server=server)  # pragma: no cover
+    >>> name1 = get_test_session_name(server=server)  # pragma: no cover
+    >>> name2 = get_test_session_name(server=server)  # pragma: no cover
+    >>> name1 != name2  # pragma: no cover
     True
     """
     while True:
@@ -118,9 +119,9 @@ def get_test_window_name(
     'libtmux_...'
 
     Never the same twice:
-
-    >>> get_test_window_name(session=session) != \
-    ...     get_test_window_name(session=session)  # pragma: no cover
+    >>> name1 = get_test_window_name(session=session)  # pragma: no cover
+    >>> name2 = get_test_window_name(session=session)  # pragma: no cover
+    >>> name1 != name2  # pragma: no cover
     True
     """
     assert prefix is not None

tests/test/test_environment.py

@@ -121,7 +121,7 @@ def test_environment_var_guard_exit_with_exception() -> None:
 
     # Call __exit__ with exception parameters
     env.__exit__(
-        t.cast(type[BaseException], RuntimeError),
+        t.cast("type[BaseException]", RuntimeError),
         RuntimeError("Test exception"),
         None,
     )