doc hash-function-transition: clarify how older gits die on NewHash

diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index a9a9478a293f97920c6e3fb6d31653d8b37989a6..b170fb02b80356455d03dcf379636778149665a6 100755 (executable)
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -397,6 +397,26 @@ test_expect_success TTY 'diffs can be colorized' '
        grep "$(printf "\\033")" output
 '
 
+test_expect_success TTY 'diffFilter filters diff' '
+       git reset --hard &&
+
+       echo content >test &&
+       test_config interactive.diffFilter "sed s/^/foo:/" &&
+       printf y | test_terminal git add -p >output 2>&1 &&
+
+       # avoid depending on the exact coloring or content of the prompts,
+       # and just make sure we saw our diff prefixed
+       grep foo:.*content output
+'
+
+test_expect_success TTY 'detect bogus diffFilter output' '
+       git reset --hard &&
+
+       echo content >test &&
+       test_config interactive.diffFilter "echo too-short" &&
+       printf y | test_must_fail test_terminal git add -p
+'
+
 test_expect_success 'patch-mode via -i prompts for files' '
        git reset --hard &&