v8/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
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function MjsUnitAssertionError(message) {
  this.message = message;
  // This allows fetching the stack trace using TryCatch::StackTrace.
  this.stack = new Error("").stack;
}

/*
 * 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.
 */


MjsUnitAssertionError.prototype.toString = function () {
  return this.message + "\n\nStack: " + this.stack;
};


// Expected and found values the same objects, or the same primitive
// values.
// For known primitive values, please use assertEquals.
var assertSame;

// Expected and found values are identical primitive values or functions
// or similarly structured objects (checking internal properties
// of, e.g., Number and Date objects, the elements of arrays
// and the properties of non-Array objects).
var assertEquals;


// The difference between expected and found value is within certain tolerance.
var assertEqualsDelta;

// The found object is an Array with the same length and elements
// as the expected object. The expected object doesn't need to be an Array,
// as long as it's "array-ish".
var assertArrayEquals;

// The found object must have the same enumerable properties as the
// expected object. The type of object isn't checked.
var assertPropertiesEqual;

// Assert that the string conversion of the found value is equal to
// the expected string. Only kept for backwards compatability, please
// check the real structure of the found value.
var assertToStringEquals;

// Checks that the found value is true. Use with boolean expressions
// for tests that doesn't have their own assertXXX function.
var assertTrue;

// Checks that the found value is false.
var assertFalse;

// Checks that the found value is null. Kept for historical compatibility,
// please just use assertEquals(null, expected).
var assertNull;

// Checks that the found value is *not* null.
var assertNotNull;

// Assert that the passed function or eval code throws an exception.
// The optional second argument is an exception constructor that the
// thrown exception is checked against with "instanceof".
// The optional third argument is a message type string that is compared
// to the type property on the thrown exception.
var assertThrows;

// Assert that the passed function throws an exception.
// The exception is checked against the second argument using assertEquals.
var assertThrowsEquals;

// Assert that the passed function or eval code does not throw an exception.
var assertDoesNotThrow;

// Asserts that the found value is an instance of the constructor passed
// as the second argument.
var assertInstanceof;

// Assert that this code is never executed (i.e., always fails if executed).
var assertUnreachable;

// Assert that the function code is (not) optimized.  If "no sync" is passed
// as second argument, we do not wait for the concurrent optimization thread to
// finish when polling for optimization status.
// Only works with --allow-natives-syntax.
var assertOptimized;
var assertUnoptimized;

// Assert that a string contains another expected substring.
var assertContains;

// Assert that a string matches a given regex.
var assertMatches;


(function () {  // Scope for utility functions.

  var ObjectPrototypeToString = Object.prototype.toString;
  var NumberPrototypeValueOf = Number.prototype.valueOf;
  var BooleanPrototypeValueOf = Boolean.prototype.valueOf;
  var StringPrototypeValueOf = String.prototype.valueOf;
  var DatePrototypeValueOf = Date.prototype.valueOf;
  var RegExpPrototypeToString = RegExp.prototype.toString;
  var ArrayPrototypeMap = Array.prototype.map;
  var ArrayPrototypeJoin = Array.prototype.join;

  function classOf(object) {
    // Argument must not be null or undefined.
    var string = ObjectPrototypeToString.call(object);
    // String has format [object <ClassName>].
    return string.substring(8, string.length - 1);
  }


  function ValueOf(value) {
    switch (classOf(value)) {
      case "Number":
        return NumberPrototypeValueOf.call(value);
      case "String":
        return StringPrototypeValueOf.call(value);
      case "Boolean":
        return BooleanPrototypeValueOf.call(value);
      case "Date":
        return DatePrototypeValueOf.call(value);
      default:
        return value;
    }
  }


  function PrettyPrint(value) {
    switch (typeof value) {
      case "string":
        return JSON.stringify(value);
      case "number":
        if (value === 0 && (1 / value) < 0) return "-0";
        // FALLTHROUGH.
      case "boolean":
      case "undefined":
      case "function":
      case "symbol":
        return String(value);
      case "object":
        if (value === null) return "null";
        var objectClass = classOf(value);
        switch (objectClass) {
          case "Number":
          case "String":
          case "Boolean":
          case "Date":
            return objectClass + "(" + PrettyPrint(ValueOf(value)) + ")";
          case "RegExp":
            return RegExpPrototypeToString.call(value);
          case "Array":
            var mapped = ArrayPrototypeMap.call(value, PrettyPrintArrayElement);
            var joined = ArrayPrototypeJoin.call(mapped, ",");
            return "[" + joined + "]";
          case "Object":
            break;
          default:
            return objectClass + "()";
        }
        // [[Class]] is "Object".
        var name = value.constructor.name;
        if (name) return name + "()";
        return "Object()";
      default:
        return "-- unknown value --";
    }
  }


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


  function failWithMessage(message) {
    throw new MjsUnitAssertionError(message);
  }


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

    var foundText = PrettyPrint(found);
    if (expectedText.length <= 40 && foundText.length <= 40) {
      message += ": expected <" + expectedText + "> found <" + foundText + ">";
    } else {
      message += ":\nexpected:\n" + expectedText + "\nfound:\n" + foundText;
    }
    throw new MjsUnitAssertionError(message);
  }


  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;
  }


  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 RegExpPrototypeToString.call(a) ===
             RegExpPrototypeToString.call(b);
    }
    // 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 (ValueOf(a) !== ValueOf(b)) return false;
    }
    return deepObjectEquals(a, b);
  }

  assertSame = function assertSame(expected, found, name_opt) {
    // TODO(mstarzinger): We should think about using Harmony's egal operator
    // or the function equivalent Object.is() here.
    if (found === expected) {
      if (expected !== 0 || (1 / expected) === (1 / found)) return;
    } else if ((expected !== expected) && (found !== found)) {
      return;
    }
    fail(PrettyPrint(expected), found, name_opt);
  };


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


  assertEqualsDelta =
      function assertEqualsDelta(expected, found, delta, name_opt) {
    assertTrue(Math.abs(expected - found) <= delta, name_opt);
  };


  assertArrayEquals = 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);
      }
    }
  };


  assertPropertiesEqual = function assertPropertiesEqual(expected, found,
                                                         name_opt) {
    // Check properties only.
    if (!deepObjectEquals(expected, found)) {
      fail(expected, found, name_opt);
    }
  };


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


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


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


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


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


  assertThrows = 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);
      } else if (type_opt !== void 0) {
        failWithMessage("invalid use of assertThrows, maybe you want assertThrowsEquals");
      }
      if (arguments.length >= 3) {
        assertEquals(e.message, cause_opt);
      }
      // Success.
      return;
    }
    failWithMessage("Did not throw exception");
  };


  assertThrowsEquals = function assertThrowsEquals(fun, val) {
    try {
      fun();
    } catch(e) {
      assertEquals(val, e);
      return;
    }
    failWithMessage("Did not throw exception");
  };


  assertInstanceof = function assertInstanceof(obj, type) {
    if (!(obj instanceof type)) {
      var actualTypeName = null;
      var actualConstructor = Object.getPrototypeOf(obj).constructor;
      if (typeof actualConstructor === "function") {
        actualTypeName = actualConstructor.name || String(actualConstructor);
      }
      failWithMessage("Object <" + PrettyPrint(obj) + "> is not an instance of <" +
               (type.name || type) + ">" +
               (actualTypeName ? " but of <" + actualTypeName + ">" : ""));
    }
  };


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

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

  assertContains = function(sub, value, name_opt) {
    if (value == null ? (sub != null) : value.indexOf(sub) == -1) {
      fail("contains '" + String(sub) + "'", value, name_opt);
    }
  };

  assertMatches = function(regexp, str, name_opt) {
    if (!(regexp instanceof RegExp)) {
      regexp = new RegExp(regexp);
    }
    if (!str.match(regexp)) {
      fail("should match '" + regexp + "'", str, name_opt);
    }
  };

  var OptimizationStatusImpl = undefined;

  var OptimizationStatus = function(fun, sync_opt) {
    if (OptimizationStatusImpl === undefined) {
      try {
        OptimizationStatusImpl = new Function(
            "fun", "sync", "return %GetOptimizationStatus(fun, sync);");
      } catch (e) {
        throw new Error("natives syntax not allowed");
      }
    }
    return OptimizationStatusImpl(fun, sync_opt);
  }

  assertUnoptimized = function assertUnoptimized(fun, sync_opt, name_opt) {
    if (sync_opt === undefined) sync_opt = "";
    assertTrue(OptimizationStatus(fun, sync_opt) !== 1, name_opt);
  }

  assertOptimized = function assertOptimized(fun, sync_opt, name_opt) {
    if (sync_opt === undefined) sync_opt = "";
    assertTrue(OptimizationStatus(fun, sync_opt) !== 2, name_opt);
  }

})();