prune-packed: only show progress when stderr is a tty

diff --git a/t/t4015-diff-whitespace.sh b/t/t4015-diff-whitespace.sh
index 6d13da30dad5a78fb17a01e86ef33072ea9e6250..8dd147d78f6ee6a4be4b1af235ed35af19b273df 100755 (executable)
--- a/t/t4015-diff-whitespace.sh
+++ b/t/t4015-diff-whitespace.sh
@@ -362,10 +362,17 @@ test_expect_success 'line numbers in --check output are correct' '
 
 '
 
-test_expect_success 'checkdiff detects trailing blank lines' '
+test_expect_success 'checkdiff detects new trailing blank lines (1)' '
        echo "foo();" >x &&
        echo "" >>x &&
-       git diff --check | grep "ends with blank"
+       git diff --check | grep "new blank line"
+'
+
+test_expect_success 'checkdiff detects new trailing blank lines (2)' '
+       { echo a; echo b; echo; echo; } >x &&
+       git add x &&
+       { echo a; echo; echo; echo; echo; } >x &&
+       git diff --check | grep "new blank line"
 '
 
 test_expect_success 'checkdiff allows new blank lines' '