t3701: add a test for interactive.diffFilter

peff · gitster · commit af3570ed6ca9 · 2018-03-05T12:49:43.000-08:00
This feature was added in 0114384 (add--interactive: allow custom diff highlighting programs, 2016-02-27) but never tested. Let's add a basic test. Note that we only apply the filter when color is enabled, so we have to use test_terminal. This is an open limitation explicitly mentioned in the original commit. So take this commit as testing the status quo, and not making a statement on whether we'd want to enhance that in the future. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
@@ -392,6 +392,18 @@ 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 'patch-mode via -i prompts for files' '
 	git reset --hard &&
 
