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 &&