test-lib: introduce test_line_count to measure files
Some tests check their output with code like the following: test "$(git ls-files -u B | wc -l)" -eq 3 || { echo "BAD: should have left stages for B" return 1 } The verbose failure condition is used because test, unlike diff, does not print any useful information about the nature of the failure when it fails. Introduce a test_line_count function to help. If used like git ls-files -u B >output && test_line_count -eq 3 output it will produce output like test_line_count: line count for output !-eq 3 100644 b023018cabc396e7692c70bbf5784a93d3f738ab 2 hi.c 100644 45b983be36b73c0788dc9cbcb76cbb80fc7bb057 3 hi.c on failure. Signed-off-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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