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node_modules/buffer/test/node/test-buffer-inheritance.js 824 Bytes
aaac7fed   liuqimichale   add
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  'use strict';
  var Buffer = require('../../').Buffer;
  
  
  
  var assert = require('assert');
  
  
  function T(n) {
    var 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() {
    var cntr = 0;
    for (var i = 0; i < this.length; i++)
      cntr += this[i];
    return cntr;
  };
  
  
  var vals = [new T(4), T(4)];
  
  vals.forEach(function(t) {
    assert.equal(t.constructor, T);
    assert.equal(Object.getPrototypeOf(t), T.prototype);
    assert.equal(Object.getPrototypeOf(Object.getPrototypeOf(t)),
      Buffer.prototype);
  
    t.fill(5);
    var cntr = 0;
    for (var i = 0; i < t.length; i++)
      cntr += t[i];
    assert.equal(t.length * 5, cntr);
  
    // Check this does not throw
    t.toString();
  });