test-util-inspect.js

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var common = require('../common');
var assert = require('assert');
var util = require('util');

// test the internal isDate implementation
var Date2 = require('vm').runInNewContext('Date');
var d = new Date2();
var orig = util.inspect(d);
Date2.prototype.foo = 'bar';
var after = util.inspect(d);
assert.equal(orig, after);

// test for sparse array
var a = ['foo', 'bar', 'baz'];
assert.equal(util.inspect(a), "[ 'foo', 'bar', 'baz' ]");
delete a[1];
assert.equal(util.inspect(a), "[ 'foo', , 'baz' ]");
assert.equal(util.inspect(a, true), "[ 'foo', , 'baz', [length]: 3 ]");
assert.equal(util.inspect(new Array(5)), '[ , , , ,  ]');

// test for property descriptors
var getter = Object.create(null, {
  a: {
    get: function() { return 'aaa'; }
  }
});
var setter = Object.create(null, {
  b: {
    set: function() {}
  },
});
var getterAndSetter = Object.create(null, {
  c: {
    get: function() { return 'ccc'; },
    set: function() {}
  }
});
assert.equal(util.inspect(getter, true), "{ [a]: [Getter] }");
assert.equal(util.inspect(setter, true), "{ [b]: [Setter] }");
assert.equal(util.inspect(getterAndSetter, true), "{ [c]: [Getter/Setter] }");

// exceptions should print the error message, not "{}"
assert.equal(util.inspect(new Error()), '[Error]');
assert.equal(util.inspect(new Error('FAIL')), '[Error: FAIL]');
assert.equal(util.inspect(new TypeError('FAIL')), '[TypeError: FAIL]');
assert.equal(util.inspect(new SyntaxError('FAIL')), '[SyntaxError: FAIL]');
try {
  undef();
} catch (e) {
  assert.equal(util.inspect(e), '[ReferenceError: undef is not defined]');
}
var ex = util.inspect(new Error('FAIL'), true);
assert.ok(ex.indexOf('[Error: FAIL]') != -1);
assert.ok(ex.indexOf('[stack]') != -1);
assert.ok(ex.indexOf('[message]') != -1);
assert.ok(ex.indexOf('[arguments]') != -1);
assert.ok(ex.indexOf('[type]') != -1);

// GH-1941
// should not throw:
assert.equal(util.inspect(Object.create(Date.prototype)), '{}');

// GH-1944
assert.doesNotThrow(function() {
  var d = new Date();
  d.toUTCString = null;
  util.inspect(d);
});

assert.doesNotThrow(function() {
  var r = /regexp/;
  r.toString = null;
  util.inspect(r);
});

// GH-2225
var x = { inspect: util.inspect };
assert.ok(util.inspect(x).indexOf('inspect') != -1);