diff --git a/tests/playTests.sh b/tests/playTests.sh
index ad096fddd..19fc514f6 100755
--- a/tests/playTests.sh
+++ b/tests/playTests.sh
@@ -526,6 +526,15 @@ $ZSTD -o tmpDict --train "$TESTDIR"/*.c "$PRGDIR"/*.c
 test -f tmpDict
 $ZSTD --train "$TESTDIR"/*.c "$PRGDIR"/*.c
 test -f dictionary
+println "- Test dictionary training fails"
+echo "000000000000000000000000000000000" > tmpz
+$ZSTD --train tmpz tmpz tmpz tmpz tmpz tmpz tmpz tmpz tmpz && die "Dictionary training should fail : source is all zeros"
+if [ -n "$hasMT" ]
+then
+  $ZSTD --train -T0 tmpz tmpz tmpz tmpz tmpz tmpz tmpz tmpz tmpz && die "Dictionary training should fail : source is all zeros"
+  println "- Create dictionary with multithreading enabled"
+  $ZSTD --train -T0 "$TESTDIR"/*.c "$PRGDIR"/*.c -o tmpDict
+fi
 rm tmp* dictionary