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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//       with the distribution.
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function MjsUnitAssertionError(message) {
  this.message = message;
}

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 fail(expected, found, name_opt) {
  var start;
  if (name_opt) {
    // Fix this when we ditch the old test runner.
    start = "Fail" + "ure (" + name_opt + "): ";
  } else {
    start = "Fail" + "ure:";
  }
  throw new MjsUnitAssertionError(start + " expected <" + expected + "> found <" + found + ">");
}


function deepEquals(a, b) {
  if (a == b) return true;
  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;
  }
  return false;
}


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 assertThrows(code) {
  var threwException = true;
  try {
    eval(code);
    threwException = false;
  } catch (e) {
    // 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 {
    eval(code);
  } catch (e) {
    assertTrue(false, "threw an exception");
  }
}


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);
}