Index: tests/natools-smaz-tests.adb
==================================================================
--- tests/natools-smaz-tests.adb
+++ tests/natools-smaz-tests.adb
@@ -172,10 +172,13 @@
       Roundtrip_Test (Test, Original.Dictionary,
          "1000 numbers 2000 will 10 20 30 compress very little",
          (255, 3, 49, 48, 48, 48, 236, 38, 45, 92, 221, 0, 255, 3, 50, 48, 48,
            48, 243, 152, 0, 255, 7, 49, 48, 32, 50, 48, 32, 51,
            48, 161, 45, 60, 33, 166, 0, 231, 71, 151, 3, 3, 87));
+      Roundtrip_Test (Test, Original.Dictionary,
+         ": : : :",
+         (255, 6, 58, 32, 58, 32, 58, 32, 58));
    exception
       when Error : others => Test.Report_Exception (Error);
    end Sample_Strings;
 
 end Natools.Smaz.Tests;