fix bsd shell negation

diff --git a/t/t4125-apply-ws-fuzz.sh b/t/t4125-apply-ws-fuzz.sh
index d6f15be6718d581bb2a8e3ef05930977b8dffdb9..3b471b641ba2d3274dd1ab89948485ff8ce4dfdb 100755 (executable)
--- a/t/t4125-apply-ws-fuzz.sh
+++ b/t/t4125-apply-ws-fuzz.sh
@@ -56,7 +56,7 @@ test_expect_success nofix '
        git apply --whitespace=nowarn patch-1 &&
 
        # The result should obviously match.
-       diff -u file-1 file
+       test_cmp file-1 file
 '
 
 test_expect_success 'withfix (forward)' '
@@ -70,7 +70,7 @@ test_expect_success 'withfix (forward)' '
        git apply --whitespace=fix patch-0 &&
        git apply --whitespace=fix patch-1 &&
 
-       diff -u file-fixed file
+       test_cmp file-fixed file
 '
 
 test_expect_success 'withfix (backward)' '
@@ -91,12 +91,12 @@ test_expect_success 'withfix (backward)' '
 
        sed -e /h/d file-fixed >fixed-head &&
        sed -e /h/d file >file-head &&
-       diff -u fixed-head file-head &&
+       test_cmp fixed-head file-head &&
 
        sed -n -e /h/p file-fixed >fixed-tail &&
        sed -n -e /h/p file >file-tail &&
 
-       ! diff -u fixed-tail file-tail
+       ! test_cmp fixed-tail file-tail
 
 '