t5701: modernize style
This test is pretty old and did not follow some of our more modern best practices. In particular: 1. It chdir'd all over the place, leaving later tests to deal with the fallout. Do our chdirs in subshells instead. 2. It did not use test_must_fail. 3. It did not use test_line_count. 4. It checked for the non-existence of a ref by looking in the .git/refs directory (since we pack refs during clone these days, this will always be succeed, making the test useless). Note that one call to "-e .git/refs/..." remains, because it is checking for the existence of a symbolic ref, not a ref itself. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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