test/intl/assert.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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//       notice, this list of conditions and the following disclaimer.
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// Some methods are taken from v8/test/mjsunit/mjsunit.js

/**
 * Compares two objects for key/value equality.
 * Returns true if they are equal, false otherwise.
 */
function deepObjectEquals(a, b) {
  var aProps = Object.keys(a);
  aProps.sort();
  var bProps = Object.keys(b);
  bProps.sort();
  if (!deepEquals(aProps, bProps)) {
    return false;
  }
  for (var i = 0; i < aProps.length; i++) {
    if (!deepEquals(a[aProps[i]], b[aProps[i]])) {
      return false;
    }
  }
  return true;
}


/**
 * Compares two JavaScript values for type and value equality.
 * It checks internals of arrays and objects.
 */
function deepEquals(a, b) {
  if (a === b) {
    // Check for -0.
    if (a === 0) return (1 / a) === (1 / b);
    return true;
  }
  if (typeof a != typeof b) return false;
  if (typeof a == 'number') return isNaN(a) && isNaN(b);
  if (typeof a !== 'object' && typeof a !== 'function') return false;
  // Neither a nor b is primitive.
  var objectClass = classOf(a);
  if (objectClass !== classOf(b)) return false;
  if (objectClass === 'RegExp') {
    // For RegExp, just compare pattern and flags using its toString.
    return (a.toString() === b.toString());
  }
  // Functions are only identical to themselves.
  if (objectClass === 'Function') return false;
  if (objectClass === 'Array') {
    var elementCount = 0;
    if (a.length != b.length) {
      return false;
    }
    for (var i = 0; i < a.length; i++) {
      if (!deepEquals(a[i], b[i])) return false;
    }
    return true;
  }
  if (objectClass == 'String' || objectClass == 'Number' ||
      objectClass == 'Boolean' || objectClass == 'Date') {
    if (a.valueOf() !== b.valueOf()) return false;
  }
  return deepObjectEquals(a, b);
}


/**
 * Throws an exception, and prints the values in case of error.
 */
function fail(expected, found) {
  // TODO(cira): Replace String with PrettyPrint for objects and arrays.
  var message = 'Failure: expected <' + String(expected) + '>, found <' +
      String(found) + '>.';
  throw new Error(message);
}


/**
 * Throws if two variables have different types or values.
 */
function assertEquals(expected, found) {
  if (!deepEquals(expected, found)) {
    fail(expected, found);
  }
}


/**
 * Throws if value is false.
 */
function assertTrue(value) {
  assertEquals(true, value)
}


/**
 * Throws if value is true.
 */
function assertFalse(value) {
  assertEquals(false, value);
}


/**
 * Returns true if code throws specified exception.
 */
function assertThrows(code, type_opt, cause_opt) {
  var threwException = true;
  try {
    if (typeof code == 'function') {
      code();
    } else {
      eval(code);
    }
    threwException = false;
  } catch (e) {
    if (typeof type_opt == 'function') {
      assertInstanceof(e, type_opt);
    }
    if (arguments.length >= 3) {
      assertEquals(e.type, cause_opt);
    }
    // Success.
    return;
  }
  throw new Error("Did not throw exception");
}


/**
 * Throws an exception if code throws.
 */
function assertDoesNotThrow(code, name_opt) {
  try {
    if (typeof code == 'function') {
      code();
    } else {
      eval(code);
    }
  } catch (e) {
    fail("threw an exception: ", e.message || e, name_opt);
  }
}


/**
 * Throws if obj is not of given type.
 */
function assertInstanceof(obj, type) {
  if (!(obj instanceof type)) {
    var actualTypeName = null;
    var actualConstructor = Object.prototypeOf(obj).constructor;
    if (typeof actualConstructor == "function") {
      actualTypeName = actualConstructor.name || String(actualConstructor);
    }
    throw new Error('Object <' + obj + '> is not an instance of <' +
         (type.name || type) + '>' +
         (actualTypeName ? ' but of < ' + actualTypeName + '>' : ''));
  }
}