t5100: Avoid filename "nul"

diff --git a/t/t4015-diff-whitespace.sh b/t/t4015-diff-whitespace.sh
index 83c54b747f4efe1f99b67284a7ba72b89df07a6d..ca0302f41b332df053baa72362099ba691f2ff97 100755 (executable)
--- a/t/t4015-diff-whitespace.sh
+++ b/t/t4015-diff-whitespace.sh
@@ -43,13 +43,13 @@ index adf3937..6edc172 100644
 EOF
 
 git diff > out
-test_expect_success "Ray's example without options" 'git diff expect out'
+test_expect_success "Ray's example without options" 'test_cmp expect out'
 
 git diff -w > out
-test_expect_success "Ray's example with -w" 'git diff expect out'
+test_expect_success "Ray's example with -w" 'test_cmp expect out'
 
 git diff -b > out
-test_expect_success "Ray's example with -b" 'git diff expect out'
+test_expect_success "Ray's example with -b" 'test_cmp expect out'
 
 tr 'Q' '\015' << EOF > x
 whitespace at beginning
@@ -90,14 +90,14 @@ index d99af23..8b32fb5 100644
 +CR at end
 EOF
 git diff > out
-test_expect_success 'another test, without options' 'git diff expect out'
+test_expect_success 'another test, without options' 'test_cmp expect out'
 
 cat << EOF > expect
 diff --git a/x b/x
 index d99af23..8b32fb5 100644
 EOF
 git diff -w > out
-test_expect_success 'another test, with -w' 'git diff expect out'
+test_expect_success 'another test, with -w' 'test_cmp expect out'
 
 tr 'Q' '\015' << EOF > expect
 diff --git a/x b/x
@@ -115,7 +115,7 @@ index d99af23..8b32fb5 100644
  CR at endQ
 EOF
 git diff -b > out
-test_expect_success 'another test, with -b' 'git diff expect out'
+test_expect_success 'another test, with -b' 'test_cmp expect out'
 
 test_expect_success 'check mixed spaces and tabs in indent' '