--- /dev/null
+\version "2.16.0"
+#(ly:set-option 'warning-as-error #f)
+#(ly:expect-warning (_ "Barcheck failed got ~a expect ~a") 3 15)
+
+\header {
+
+texidoc="Bar numbers check may be inserted to check whether the current
+bar number is correct.
+"
+
+}
+
+\relative c'' {
+ c1 |
+ \barNumberCheck #2 % OK
+ c1 |
+ \barNumberCheck #15 % Warning
+ c1
+}