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node_modules/stack-chain/test/simple/format-tostring-non-generic.js

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+
+var test = require("tap").test;
+var chain = require('../../');
+var produce = require('../produce.js');
+
+// See issue https://github.com/AndreasMadsen/stack-chain/issues/12 for
+// a detailed explaination.
+
+test("formatter works for non-generic (non-safe) toString", function (t) {
+  var base = function () {}
+  base.toString = base.toString // sets base.toString to base[[proto]].toString
+  Object.setPrototypeOf(base, {}); // sets base[[proto]] = {}
+
+  var error = Object.create(base); // wrap base using prototype chain
+  Error.captureStackTrace(error); // prepear error.stack
+
+  t.equal(error.stack.split('\n').length, 11);
+  t.end();
+});