Added some tests

tests/node_modules/tape/test/double_end/double.js

@@ -0,0 +1,13 @@
+'use strict';
+
+var test = require('../../');
+
+test('double end', function (t) {
+    function doEnd() {
+        t.end();
+    }
+
+    t.equal(1 + 1, 2);
+    t.end();
+    setTimeout(doEnd, 5);
+});