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-rwxr-xr-xt/t4053-diff-no-index.sh8
1 files changed, 8 insertions, 0 deletions
diff --git a/t/t4053-diff-no-index.sh b/t/t4053-diff-no-index.sh
index 6e0dd6f9e5..4331b3118a 100755
--- a/t/t4053-diff-no-index.sh
+++ b/t/t4053-diff-no-index.sh
@@ -137,4 +137,12 @@ test_expect_success 'diff --no-index from repo subdir with absolute paths' '
test_cmp expect actual
'
+test_expect_success 'diff --no-index allows external diff' '
+ test_expect_code 1 \
+ env GIT_EXTERNAL_DIFF="echo external ;:" \
+ git diff --no-index non/git/a non/git/b >actual &&
+ echo external >expect &&
+ test_cmp expect actual
+'
+
test_done