t6026-merge-attr: clean up background process at end of test case

diff --git a/t/t0021-conversion.sh b/t/t0021-conversion.sh
index 7bac2bcf260794bbfeb795b210ed0c9eceb45937..e799e5954437e08df4a013f9796c5ec5a9bb077d 100755 (executable)
--- a/t/t0021-conversion.sh
+++ b/t/t0021-conversion.sh
@@ -268,4 +268,15 @@ test_expect_success 'disable filter with empty override' '
        test_must_be_empty err
 '
 
+test_expect_success 'diff does not reuse worktree files that need cleaning' '
+       test_config filter.counter.clean "echo . >>count; sed s/^/clean:/" &&
+       echo "file filter=counter" >.gitattributes &&
+       test_commit one file &&
+       test_commit two file &&
+
+       >count &&
+       git diff-tree -p HEAD &&
+       test_line_count = 0 count
+'
+
 test_done