t0020: use test_* helpers instead of hand-rolled messages
These tests are not wrong, but it is much shorter and more idiomatic to say "verbose" or "test_must_fail" rather than printing our own messages on failure. Likewise, there is no need to say "happy" at the end of a test; the test suite takes care of that. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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