diff --git a/test/testsuite.sh b/test/testsuite.sh
index 956963f..f07ded8 100755
--- a/test/testsuite.sh
+++ b/test/testsuite.sh
@@ -4,22 +4,50 @@ check()
 {
     RATIO="$1"
     CMD="$2"
-    $ZZUF -r $RATIO $CMD 2>/dev/null | md5sum
+    ALIAS="$3"
+    echo -n " $(echo "$ALIAS:              " | cut -b1-15)"
+    NEWMD5="$($ZZUF -r $RATIO $CMD 2>/dev/null | md5sum | cut -b1-32)"
+    if [ -z "$MD5" ]; then
+        MD5="$NEWMD5"
+        echo "$NEWMD5"
+    elif [ "$NEWMD5" != "$MD5" ]; then
+        OK=0
+        echo "$NEWMD5"
+    else
+        echo ' ...'
+    fi
 }
 
 ZZUF="$(dirname "$0")/../src/zzuf"
+FAILED=0
+TESTED=0
 
 for file in /etc/passwd $ZZUF; do
     for r in 0.0 0.001 0.01 0.1 1; do
         echo "Testing zzuf on $file, ratio $r:"
-        echo "-  cat          $(check $r "cat $file")"
+        OK=1
+        MD5=""
+        check $r "cat $file" "cat"
 # don't do grep, it adds a newline at EOF!
-#        echo "-  grep -a ''   $(check $r "grep -- -a \\'\\' $file")"
-        echo "-  sed n        $(check $r "sed n $file")"
-        echo "-  dd(bs=1)     $(check $r "dd bs=1 if=$file")"
-        echo "-  dd(bs=1024)  $(check $r "dd bs=1024 if=$file")"
-        echo "-  dd(bs=1111)  $(check $r "dd bs=1111 if=$file")"
-        echo "-  dd(bs=65536) $(check $r "dd bs=65536 if=$file")"
+#        check $r "grep -- -a \\'\\' $file" "grep -a"
+        check $r "sed n $file" "sed n"
+        check $r "dd bs=1 if=$file" "dd(bs=1)"
+        check $r "dd bs=1024 if=$file" "dd(bs=1024)"
+        check $r "dd bs=1111 if=$file" "dd(bs=1111)"
+        check $r "dd bs=65536 if=$file" "dd(bs=65536)"
+        if [ "$OK" != 1 ]; then
+            echo "*** FAILED ***"
+            FAILED=$(($FAILED + 1))
+        fi
+        TESTED=$(($TESTED + 1))
+        echo ""
     done
 done
 
+if [ "$FAILED" != 0 ]; then
+    echo "$FAILED tests failed out of $TESTED"
+    exit 1
+fi
+echo "All $TESTED tests OK."
+exit 0
+