diff --git a/tests/test.sh b/tests/test.sh
index 279dec6..06e9aa8 100755
--- a/tests/test.sh
+++ b/tests/test.sh
@@ -28,6 +28,8 @@ fi
 rm -rf "$OUTPUT"
 mkdir -p "$OUTPUT"
 
+tests/test_grammars.sh "$PROG" "$OUTPUT" || (echo "Testing aborted" ; exit 1)
+
 for i in tests/ixml_grammar_[0-9][0-9][0-9]_*.test
 do
     if [ -n $FILTER ] && [[ ! "$i" =~ $FILTER ]]; then continue; fi
diff --git a/tests/test_grammars.sh b/tests/test_grammars.sh
new file mode 100755
index 0000000..923b50d
--- /dev/null
+++ b/tests/test_grammars.sh
@@ -0,0 +1,23 @@
+#!/bin/sh
+# libxmq - Copyright 2024 Fredrik Öhrström (spdx: MIT)
+
+PROG=$1
+OUTPUT=$2
+
+if [ -z "$OUTPUT" ] || [ -z "$PROG" ]
+then
+    echo "Usage: tests/test_grammars.sh [XMQ_BINARY] [OUTPUT_DIR]"
+    exit 1
+fi
+
+mkdir -p $OUTPUT
+
+$PROG --ixml=grammars/core/ixml.ixml grammars/core/ixml.ixml > $OUTPUT/ixml.output 2>/dev/null
+$PROG grammars/core/ixml.xml > $OUTPUT/ixml.expected 2>/dev/null
+if diff $OUTPUT/ixml.output $OUTPUT/ixml.expected
+then
+    echo "OK: test ixml.ixml"
+else
+    echo "ERR: Failed to parse ixml.ixml"
+    exit 1
+fi