)
'
+test_expect_success 'git diff --no-index with broken index' '
+ (
+ cd repo &&
+ echo broken >.git/index &&
+ git diff --no-index a ../non/git/a
+ )
+'
+
+test_expect_success 'git diff outside repo with broken index' '
+ (
+ cd repo &&
+ git diff ../non/git/a ../non/git/b
+ )
+'
+
+test_expect_success 'git diff --no-index executed outside repo gives correct error message' '
+ (
+ GIT_CEILING_DIRECTORIES=$TRASH_DIRECTORY/non &&
+ export GIT_CEILING_DIRECTORIES &&
+ cd non/git &&
+ test_must_fail git diff --no-index a 2>actual.err &&
+ echo "usage: git diff --no-index <path> <path>" >expect.err &&
+ test_cmp expect.err actual.err
+ )
+'
+
test_done