--- /dev/null
+var filter = require('..');
+var test = require('tape');
+
+test('filter', function(t) {
+ var arr = [1, 2, 3, 4, 5];
+ delete arr.filter;
+ var even = filter(arr, function(el) {
+ return el % 2 == 0;
+ });
+ t.deepEqual(even, [2, 4]);
+ t.end();
+});