Fix broken test in cat.test.

"cat /proc/self/exe && cmp /proc/self/exe" won't see the same file if cat
and cmp aren't both in a toybox multiplexer binary, so snapshot and pick one.

1 files changed, 3 insertions, 2 deletions

diff --git a/tests/cat.test b/tests/cat.test
index 3d5842ae..7be515dd 100755
--- a/tests/cat.test
+++ b/tests/cat.test
@@ -16,8 +16,9 @@ testing "cat file1 notfound file2" \
         "cat file1 notfound file2 2>stderr && echo ok ; cat stderr; rm stderr" \
         "one\ntwo\ncat: notfound: No such file or directory\n" "" ""
 
+FILE="$(readlink -f /proc/self/exe)"
 testing "cat file1" \
-        "cat /proc/self/exe > file1 && cmp /proc/self/exe file1 && echo yes" \
+        'cat "$FILE" > file1 && cmp "$FILE" file1 && echo yes' \
         "yes\n" "" ""
 
 testing "cat - file1" \
@@ -28,4 +29,4 @@ testing "cat > /dev/full" \
         "cat - > /dev/full 2>stderr && echo ok; cat stderr; rm stderr" \
         "cat: xwrite: No space left on device\n" "" "zero\n"
 
-rm file1 file2
\ No newline at end of file
+rm file1 file2