diff --git a/scripts/test/zlibutil.sh b/scripts/test/zlibutil.sh
index c29e5fd..326b983 100755
--- a/scripts/test/zlibutil.sh
+++ b/scripts/test/zlibutil.sh
@@ -1,26 +1,46 @@
 #!/usr/bin/env bash
 echo "================================================================================"
-echo -n "Testing \`zlibutil\`... "
+echo "Testing \`zlibutil\`:"
+echo "--------------------------------------------------------------------------------"
 
+TMPDIR="$(mktemp -d -t fossvg-zlibutil-XXXXX)"
+TMPDATA="$(dd if=/dev/urandom bs=33 count=1 2>/dev/null | base64)"
 
-echo "abc" >> testfile
+echo -n "Compression test... "
 
-bin/tools/zlibutil -c testfile
+echo -n "$TMPDATA" >> "$TMPDIR/compress"
+zlibutil "$TMPDIR/compress"
 
-if [ "$(bin/tools/arraydump --binary testfile.compressed)" = "{0b01111000, 0b10011100, 0b01001011, 0b01001100, 0b01001010, 0b11100110, 0b00000010, 0b00000000, 0b00000011, 0b01111110, 0b00000001, 0b00110001}" ]; then
-    echo -n "Compression Test: PASS... "
+python3 <<< "
+import zlib, sys
+tmpfile = open('$TMPDIR/compress.zz', 'rb')
+data = tmpfile.read()
+tmpfile.close()
+try:
+    if zlib.decompress(data)==b'$TMPDATA':
+        print('PASS')
+    else:
+        print('FAIL: Wrong data.')
+except:
+    print('FAIL: Exception.')
+"
+
+echo -n "Decompression test... "
+#TODO: create a compressed file using another implementation (Python)
+python3 <<< "
+import zlib
+tmpfile = open('$TMPDIR/decompress.zz', 'wb')
+tmpfile.write(zlib.compress(b'$TMPDATA'))
+tmpfile.close()
+"
+
+zlibutil -d "$TMPDIR/decompress.zz"
+if [ "$(cat "$TMPDIR/decompress")" = "$TMPDATA" ]; then
+    echo "PASS"
 else
-    echo -n "Compression Test: FAILED... "
+    echo "FAIL"
 fi
 
-bin/tools/zlibutil -d testfile.compressed
-
-if [ "$(bin/tools/arraydump --binary testfile.compressed.uncompressed)" = "{0b01100001, 0b01100010, 0b01100011, 0b00001010}" ]; then
-    echo "Decompression Test: PASS"
-else
-    echo "Decompression Test: FAILED"
-fi
-
-rm testfile testfile.compressed testfile.compressed.uncompressed
+rm -r "$TMPDIR"
 
 echo "================================================================================"