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gtestutils: Add more convenience functions

Merged Simon McVittie requested to merge wip/test-fail-convenience into main

Based on !2216 (merged) (without which the tests added here will fail), please review that first.

  • gtestutils: Allow failing a test with a printf-style message

    This allows a pattern like

      g_test_message ("cannot reticulate splines: %s", error->message);
  g_test_fail ();

    to be replaced by the simpler

      g_test_fail_message ("cannot reticulate splines: %s", error->message);

    with the secondary benefit of making the message available to TAP consumers as part of the "not ok" message.

  • tests: Make use of g_test_fail_message()

  • gtestutils: Allow skipping tests with a printf-style message

    Forming the g_test_skip() message from printf-style arguments seems common enough to deserve a convenience function.

    g_test_incomplete() is mechanically almost equivalent to g_test_skip() (the semantics are different but the implementation is very similar), so give it a similar mechanism for symmetry.

  • tests: Use g_test_skip_printf()

Edited by Simon McVittie