add test_cmp function for test scripts
Many scripts compare actual and expected output using "diff -u". This is nicer than "cmp" because the output shows how the two differ. However, not all versions of diff understand -u, leading to unnecessary test failure. This adds a test_cmp function to the test scripts and switches all "diff -u" invocations to use it. The function uses the contents of "$GIT_TEST_CMP" to compare its arguments; the default is "diff -u". On systems with a less-capable diff, you can do: GIT_TEST_CMP=cmp make test Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Junio C Hamano

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@ -150,7 +150,7 @@ test_expect_success 'diff -U0' '
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do
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git diff -U0 file-?$n
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done | zc >actual &&
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diff -u expect actual
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test_cmp expect actual
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'
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