test_cmp expected_n result
'
+test_expect_success 'set up abbrev tests' '
+ test_commit abbrev &&
+ sha1=$(git rev-parse --verify HEAD) &&
+ check_abbrev () {
+ expect=$1; shift
+ echo $sha1 | cut -c 1-$expect >expect &&
+ git blame "$@" abbrev.t >actual &&
+ perl -lne "/[0-9a-f]+/ and print \$&" <actual >actual.sha &&
+ test_cmp expect actual.sha
+ }
+'
+
+test_expect_success 'blame --abbrev=<n> works' '
+ # non-boundary commits get +1 for alignment
+ check_abbrev 31 --abbrev=30 HEAD &&
+ check_abbrev 30 --abbrev=30 ^HEAD
+'
+
+test_expect_success 'blame -l aligns regular and boundary commits' '
+ check_abbrev 40 -l HEAD &&
+ check_abbrev 39 -l ^HEAD
+'
+
+test_expect_success 'blame --abbrev=40 behaves like -l' '
+ check_abbrev 40 --abbrev=40 HEAD &&
+ check_abbrev 39 --abbrev=40 ^HEAD
+'
+
+test_expect_success '--no-abbrev works like --abbrev=40' '
+ check_abbrev 40 --no-abbrev
+'
+
test_done