text: /*
   * tst.inherit.js: test that inheriting from VError and WError work as expected.
   */
  
  var mod_assert = require('assert');
  var mod_util = require('util');
  
  var mod_verror = require('../lib/verror');
  
  var VError = mod_verror.VError;
  var WError = mod_verror.WError;
  var err, suberr;
  
  function VErrorChild()
  {
  	VError.apply(this, Array.prototype.slice.call(arguments));
  }
  
  mod_util.inherits(VErrorChild, VError);
  VErrorChild.prototype.name = 'VErrorChild';
  
  
  function WErrorChild()
  {
  	WError.apply(this, Array.prototype.slice.call(arguments));
  }
  
  mod_util.inherits(WErrorChild, WError);
  WErrorChild.prototype.name = 'WErrorChild';
  
  
  suberr = new Error('root cause');
  err = new VErrorChild(suberr, 'top');
  mod_assert.ok(err instanceof Error);
  mod_assert.ok(err instanceof VError);
  mod_assert.ok(err instanceof VErrorChild);
  mod_assert.equal(err.cause(), suberr);
  mod_assert.equal(err.message, 'top: root cause');
  mod_assert.equal(err.toString(), 'VErrorChild: top: root cause');
  mod_assert.equal(err.stack.split('\n')[0], 'VErrorChild: top: root cause');
  
  suberr = new Error('root cause');
  err = new WErrorChild(suberr, 'top');
  mod_assert.ok(err instanceof Error);
  mod_assert.ok(err instanceof WError);
  mod_assert.ok(err instanceof WErrorChild);
  mod_assert.equal(err.cause(), suberr);
  mod_assert.equal(err.message, 'top');
  mod_assert.equal(err.toString(),
  	'WErrorChild: top; caused by Error: root cause');
  mod_assert.equal(err.stack.split('\n')[0],
  	'WErrorChild: top; caused by Error: root cause');
  
  
  // Test that `<Ctor>.toString()` uses the ctor name. I.e. setting
  // `<Ctor>.prototype.name` isn't necessary.
  function VErrorChildNoName() {
  	VError.apply(this, Array.prototype.slice.call(arguments));
  }
  mod_util.inherits(VErrorChildNoName, VError);
  err = new VErrorChildNoName('top');
  mod_assert.equal(err.toString(), 'VErrorChildNoName: top');
  
  function WErrorChildNoName() {
  	WError.apply(this, Array.prototype.slice.call(arguments));
  }
  mod_util.inherits(WErrorChildNoName, WError);
  err = new WErrorChildNoName('top');
  mod_assert.equal(err.toString(), 'WErrorChildNoName: top');
  
  
  // Test that `<Ctor>.prototype.name` can be used for the `.toString()`
  // when the ctor is anonymous.
  var VErrorChildAnon = function () {
  	VError.apply(this, Array.prototype.slice.call(arguments));
  };
  mod_util.inherits(VErrorChildAnon, VError);
  VErrorChildAnon.prototype.name = 'VErrorChildAnon';
  err = new VErrorChildAnon('top');
  mod_assert.equal(err.toString(), 'VErrorChildAnon: top');
  
  var WErrorChildAnon = function () {
  	WError.apply(this, Array.prototype.slice.call(arguments));
  };
  mod_util.inherits(WErrorChildAnon, WError);
  WErrorChildAnon.prototype.name = 'WErrorChildAnon';
  err = new WErrorChildAnon('top');
  mod_assert.equal(err.toString(), 'WErrorChildAnon: top');
  
  
  // Test get appropriate exception name in `.toString()` when reconstituting
  // an error instance a la:
  //    https://github.com/mcavage/node-fast/blob/master/lib/client.js#L215
  err = new VError('top');
  err.name = 'CustomNameError';
  mod_assert.equal(err.toString(), 'CustomNameError: top');
  
  err = new WError('top');
  err.name = 'CustomNameError';
  mod_assert.equal(err.toString(), 'CustomNameError: top');
  