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test/parallel/test-buffer-inheritance.js

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+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+
+function T(n) {
+  const ui8 = new Uint8Array(n);
+  Object.setPrototypeOf(ui8, T.prototype);
+  return ui8;
+}
+Object.setPrototypeOf(T.prototype, Buffer.prototype);
+Object.setPrototypeOf(T, Buffer);
+
+T.prototype.sum = function sum() {
+  let cntr = 0;
+  for (let i = 0; i < this.length; i++)
+    cntr += this[i];
+  return cntr;
+};
+
+
+const vals = [new T(4), T(4)];
+
+vals.forEach(function(t) {
+  assert.strictEqual(t.constructor, T);
+  assert.strictEqual(Object.getPrototypeOf(t), T.prototype);
+  assert.strictEqual(Object.getPrototypeOf(Object.getPrototypeOf(t)),
+                     Buffer.prototype);
+
+  t.fill(5);
+  let cntr = 0;
+  for (let i = 0; i < t.length; i++)
+    cntr += t[i];
+  assert.strictEqual(cntr, t.length * 5);
+
+  // Check this does not throw
+  t.toString();
+});