first commit

node_modules/stack-chain/test/simple/non-extensible-errors.js

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+var test = require("tap").test;
+var chain = require('../../');
+
+test("non extensible Error objects don't throw", function(t) {
+  var error = new Error("don't extend me");
+  Object.preventExtensions(error)
+  t.doesNotThrow(function() {
+    error.stack;
+  });
+  t.end();
+});
+
+test('stack is correct on non extensible error object', function (t) {
+  var error = new Error("don't extend me");
+  Object.preventExtensions(error);
+
+  chain.format.replace(function () {
+    return 'good';
+  });
+
+  try {
+    t.equal(error.stack, 'good');
+  } catch (e) { t.ifError(e); }
+
+  chain.format.restore();
+
+  t.end();
+});
+