test/mjsunit/mjsunit.js

// Copyright 2008 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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//       with the distribution.
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//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
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function MjsUnitAssertionError(message) {
  this.message = message;
  // This allows fetching the stack trace using TryCatch::StackTrace.
  this.stack = new Error("").stack;
}

MjsUnitAssertionError.prototype.toString = function () {
  return this.message;
}

/*
 * This file is included in all mini jsunit test cases.  The test
 * framework expects lines that signal failed tests to start with
 * the f-word and ignore all other lines.
 */

function MjsUnitToString(value) {
  switch (typeof value) {
    case "string":
      return JSON.stringify(value);
    case "number":
      if (value === 0 && (1 / value) < 0) return "-0";
    case "boolean":
    case "null":
    case "undefined":
    case "function":
      return String(value);
    case "object":
      if (value === null) return "null";
      var clazz = Object.prototype.toString.call(value);
      clazz = clazz.substring(8, clazz.length - 1);
      switch (clazz) {
        case "Number":
        case "String":
        case "Boolean":
        case "Date":
          return clazz + "(" + MjsUnitToString(value.valueOf()) + ")";
        case "RegExp":
          return value.toString();
        case "Array":
          return "[" + value.map(MjsUnitArrayElementToString).join(",") + "]";
        case "Object":
          break;
        default:
          return clazz + "()";
      }
      // [[Class]] is "Object".
      var constructor = value.constructor.name;
      if (name) return name + "()";
      return "Object()";
    default:
      return "-- unknown value --";
  }
}


function MjsUnitArrayElementToString(value, index, array) {
  if (value === undefined && !(index in array)) return "";
  return MjsUnitToString(value);
}


function fail(expected, found, name_opt) {
  var message = "Fail" + "ure";
  if (name_opt) {
    // Fix this when we ditch the old test runner.
    message += " (" + name_opt + ")";
  }

  message += ": expected <" + MjsUnitToString(expected) +
      "> found <" + MjsUnitToString(found) + ">";
  throw new MjsUnitAssertionError(message);
}


function deepObjectEquals(a, b) {
  var aProps = [];
  for (var key in a)
    aProps.push(key);
  var bProps = [];
  for (var key in b)
    bProps.push(key);
  aProps.sort();
  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;
}


function deepEquals(a, b) {
  if (a == b) {
    // Check for -0.
    if (a === 0 && b === 0) return (1 / a) === (1 / b);
    return true;
  }
  if (typeof a == "number" && typeof b == "number" && isNaN(a) && isNaN(b)) {
    return true;
  }
  if (a == null || b == null) return false;
  if (a.constructor === RegExp || b.constructor === RegExp) {
    return (a.constructor === b.constructor) && (a.toString() === b.toString());
  }
  if ((typeof a) !== 'object' || (typeof b) !== 'object' ||
      (a === null) || (b === null))
    return false;
  if (a.constructor === Array) {
    if (b.constructor !== Array)
      return false;
    if (a.length != b.length)
      return false;
    for (var i = 0; i < a.length; i++) {
      if (i in a) {
        if (!(i in b) || !(deepEquals(a[i], b[i])))
          return false;
      } else if (i in b) {
        return false;
      }
    }
    return true;
  } else {
    return deepObjectEquals(a, b);
  }
}


function assertSame(expected, found, name_opt) {
  if (found !== expected) {
    fail(expected, found, name_opt);
  }
}


function assertEquals(expected, found, name_opt) {
  if (!deepEquals(found, expected)) {
    fail(expected, found, name_opt);
  }
}


function assertArrayEquals(expected, found, name_opt) {
  var start = "";
  if (name_opt) {
    start = name_opt + " - ";
  }
  assertEquals(expected.length, found.length, start + "array length");
  if (expected.length == found.length) {
    for (var i = 0; i < expected.length; ++i) {
      assertEquals(expected[i], found[i], start + "array element at index " + i);
    }
  }
}


function assertTrue(value, name_opt) {
  assertEquals(true, value, name_opt);
}


function assertFalse(value, name_opt) {
  assertEquals(false, value, name_opt);
}


function assertNaN(value, name_opt) {
  if (!isNaN(value)) {
    fail("NaN", value, name_opt);
  }
}


function assertNull(value, name_opt) {
  if (value !== null) {
    fail("null", value, name_opt);
  }
}


function assertNotNull(value, name_opt) {
  if (value === null) {
    fail("not null", value, name_opt);
  }
}


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);
    // Do nothing.
  }
  if (!threwException) assertTrue(false, "did not throw exception");
}


function assertInstanceof(obj, type) {
  if (!(obj instanceof type)) {
    assertTrue(false, "Object <" + obj + "> is not an instance of <" + type + ">");
  }
}


function assertDoesNotThrow(code) {
  try {
    if (typeof code == 'function') {
      code();
    } else {
      eval(code);
    }
  } catch (e) {
    assertTrue(false, "threw an exception: " + (e.message || e));
  }
}


function assertUnreachable(name_opt) {
  // Fix this when we ditch the old test runner.
  var message = "Fail" + "ure: unreachable";
  if (name_opt) {
    message += " - " + name_opt;
  }
  throw new MjsUnitAssertionError(message);
}