node/deps/v8/test/mjsunit/mirror-error.js

// Copyright 2008 the V8 project authors. All rights reserved.
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// Flags: --expose-debug-as debug
// Test the mirror object for regular error objects

function MirrorRefCache(json_refs) {
  var tmp = eval('(' + json_refs + ')');
  this.refs_ = [];
  for (var i = 0; i < tmp.length; i++) {
    this.refs_[tmp[i].handle] = tmp[i];
  }
}

MirrorRefCache.prototype.lookup = function(handle) {
  return this.refs_[handle];
}

function testErrorMirror(e) {
  // Create mirror and JSON representation.
  var mirror = debug.MakeMirror(e);
  var serializer = debug.MakeMirrorSerializer();
  var json = JSON.stringify(serializer.serializeValue(mirror));
  var refs = new MirrorRefCache(
      JSON.stringify(serializer.serializeReferencedObjects()));

  // Check the mirror hierachy.
  assertTrue(mirror instanceof debug.Mirror);
  assertTrue(mirror instanceof debug.ValueMirror);
  assertTrue(mirror instanceof debug.ObjectMirror);
  assertTrue(mirror instanceof debug.ErrorMirror);

  // Check the mirror properties.
  assertTrue(mirror.isError());
  assertEquals('error', mirror.type());
  assertFalse(mirror.isPrimitive());
  assertEquals(mirror.message(), e.message, 'source');

  // Parse JSON representation and check.
  var fromJSON = eval('(' + json + ')');
  assertEquals('error', fromJSON.type);
  assertEquals('Error', fromJSON.className);
  if (e.message) {
    var found_message = false;
    for (var i in fromJSON.properties) {
      var p = fromJSON.properties[i];
      print(p.name);
      if (p.name == 'message') {
        assertEquals(e.message, refs.lookup(p.ref).value);
        found_message = true;
      }
    }
    assertTrue(found_message, 'Property message not found');
  }
  
  // Check the formatted text (regress 1231579).
  assertEquals(fromJSON.text, e.toString(), 'toString');
}


// Test Date values.
testErrorMirror(new Error());
testErrorMirror(new Error('This does not work'));
testErrorMirror(new Error(123+456));
testErrorMirror(new EvalError('EvalError'));
testErrorMirror(new RangeError('RangeError'));
testErrorMirror(new ReferenceError('ReferenceError'));
testErrorMirror(new SyntaxError('SyntaxError'));
testErrorMirror(new TypeError('TypeError'));
testErrorMirror(new URIError('URIError'));