t3701: use test-terminal to collect color output

When testing whether "add -p" can generate colors, we set
color.ui to "always". This isn't a very good test, as in the
real-world a user typically has "auto" coupled with stdout
going to a terminal (and it's plausible that this could mask
a real bug in add--interactive if we depend on plumbing's
isatty check).

Let's switch to test_terminal, which gives us a more
realistic environment. This also prepare us for future
changes to the "always" color option.

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
index 2f3e7ce..39d0130 100755 (executable)
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -2,6 +2,7 @@
 
 test_description='add -i basic tests'
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-terminal.sh
 
 if ! test_have_prereq PERL
 then
@@ -380,14 +381,11 @@ test_expect_success 'patch mode ignores unmerged entries' '
        test_cmp expected diff
 '
 
-test_expect_success 'diffs can be colorized' '
+test_expect_success TTY 'diffs can be colorized' '
        git reset --hard &&
 
-       # force color even though the test script has no terminal
-       test_config color.ui always &&
-
        echo content >test &&
-       printf y | git add -p >output 2>&1 &&
+       printf y | test_terminal git add -p >output 2>&1 &&
 
        # We do not want to depend on the exact coloring scheme
        # git uses for diffs, so just check that we saw some kind of color.