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test_cmp: diagnose incorrect arguments

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Under normal circumstances, if a test author misspells a filename passed
to test_cmp(), the error is quickly discovered when the test fails
unexpectedly due to test_cmp() being unable to find the file. However,
if the test is expected to fail, as with test_expect_failure(), a
misspelled filename as argument to test_cmp() will go unnoticed since
the test will indeed fail, but for the wrong reason. Make it easier for
test authors to discover such problems early by sanity-checking the
arguments to test_cmp(). To avoid penalizing all clients of test_cmp()
in the general case, only check for missing files if the comparison
fails.

While at it, make test_cmp_bin() sanity-check its arguments, as well.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Sunshine 2020-08-09 13:42:09 -04:00 committed by Junio C Hamano
parent 47ae905ffb
commit d572f52a64
1 changed files with 14 additions and 2 deletions
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16
t/test-lib-functions.sh
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@ -905,7 +905,13 @@ test_expect_code () {
# - not all diff versions understand "-u"
test_cmp() {
eval "$GIT_TEST_CMP" '"$@"'
test $# -eq 2 || BUG "test_cmp requires two arguments"
if ! eval "$GIT_TEST_CMP" '"$@"'
then
test "x$1" = x- || test -e "$1" || BUG "test_cmp '$1' missing"
test "x$2" = x- || test -e "$2" || BUG "test_cmp '$2' missing"
return 1
fi
}
# Check that the given config key has the expected value.
@ -934,7 +940,13 @@ test_cmp_config() {
# test_cmp_bin - helper to compare binary files
test_cmp_bin() {
cmp "$@"
test $# -eq 2 || BUG "test_cmp_bin requires two arguments"
if ! cmp "$@"
then
test "x$1" = x- || test -e "$1" || BUG "test_cmp_bin '$1' missing"
test "x$2" = x- || test -e "$2" || BUG "test_cmp_bin '$2' missing"
return 1
fi
}
# Use this instead of test_cmp to compare files that contain expected and