Get rid of the dependency to GNU diff in the tests

Now that "git diff" handles stdin and relative paths outside the
working tree correctly, we can convert all instances of "diff -u"
to "git diff".

This commit is really the result of

$ perl -pi.bak -e 's/diff -u/git diff/' $(git grep -l "diff -u" t/)

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

(cherry picked from commit c699a40d68215c7e44a5b26117a35c8a56fbd387)

1 files changed, 3 insertions, 3 deletions

diff --git a/t/t4200-rerere.sh b/t/t4200-rerere.sh
index 639d45fcec..e081b32aff 100755
--- a/t/t4200-rerere.sh
+++ b/t/t4200-rerere.sh
@@ -70,7 +70,7 @@ EOF
 
 git rerere diff > out
 
-test_expect_success 'rerere diff' 'diff -u expect out'
+test_expect_success 'rerere diff' 'git diff expect out'
 
 cat > expect << EOF
 a1
@@ -78,7 +78,7 @@ EOF
 
 git rerere status > out
 
-test_expect_success 'rerere status' 'diff -u expect out'
+test_expect_success 'rerere status' 'git diff expect out'
 
 test_expect_success 'commit succeeds' \
 	"git commit -q -a -m 'prefer first over second'"
@@ -94,7 +94,7 @@ test_expect_failure 'another conflicting merge' 'git pull . first'
 git show first:a1 | sed 's/To die: t/To die! T/' > expect
 test_expect_success 'rerere kicked in' "! grep ======= a1"
 
-test_expect_success 'rerere prefers first change' 'diff -u a1 expect'
+test_expect_success 'rerere prefers first change' 'git diff a1 expect'
 
 rm $rr/postimage
 echo "$sha1	a1" | tr '\012' '\0' > .git/rr-cache/MERGE_RR