test_cmp expected diff
'
+test_expect_success '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 &&
+
+ # 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.
+ grep "$(printf "\\033")" output
+'
+
test_done