diff -r 058bb3dc685f -r 0b59724cb3f2 cubicweb/devtools/test/data/static/js_examples/utils.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cubicweb/devtools/test/data/static/js_examples/utils.js	Sat Jan 16 13:48:51 2016 +0100
@@ -0,0 +1,29 @@
+function datetuple(d) {
+    return [d.getFullYear(), d.getMonth()+1, d.getDate(), 
+	    d.getHours(), d.getMinutes()];
+}
+    
+function pprint(obj) {
+    print('{');
+    for(k in obj) {
+	print('  ' + k + ' = ' + obj[k]);
+    }
+    print('}');
+}
+
+function arrayrepr(array) {
+    return '[' + array.join(', ') + ']';
+}
+    
+function assertArrayEquals(array1, array2) {
+    if (array1.length != array2.length) {
+	throw new crosscheck.AssertionFailure(array1.join(', ') + ' != ' + array2.join(', '));
+    }
+    for (var i=0; i<array1.length; i++) {
+	if (array1[i] != array2[i]) {
+	    
+	    throw new crosscheck.AssertionFailure(arrayrepr(array1) + ' and ' + arrayrepr(array2)
+						 + ' differs at index ' + i);
+	}
+    }
+}