Update test.bats

test/test.bats

@@ -6,13 +6,7 @@ load 'test_helper/bats-file/load'
 
 
 function random() {
-    MATRIX='0123456789'
-    LENGTH=$1
-    while [ ${n:=1} -le $LENGTH ]; do
-        rand="$rand${MATRIX:$(($RANDOM%${#MATRIX})):1}"
-        let n+=1
-    done
-    echo "$rand"
+    cat /dev/urandom | tr -dc [:num:] | head -c$1
 }
 
 function setup() {