Merge pull request #63 from kberg/master

[dygraphs.git] / auto_tests / tests / MoreAsserts.js

// Copyright (c) 2011 Google, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.


/** 
 * @fileoverview Additional assertions.
 *
 * @author konigsberg@google.com (Robert Konigsberg)
 */

/**
 * Asserts that two doubles (or two arrays of doubles) are equal
 * to within a positive delta.
 */
function assertEqualsDelta(msg, expected, actual, epsilon) {
  var args = this.argsWithOptionalMsg_(arguments, 4);
  jstestdriver.assertCount++;
  msg = args[0];
  expected = args[1];
  actual = args[2];
  epsilon = args[3];

  if (!compareDelta_(expected, actual, epsilon)) {
    this.fail(msg + 'expected ' + epsilon + ' within ' +
              this.prettyPrintEntity_(expected) +
              ' but was ' + this.prettyPrintEntity_(actual) + '');
  }
  return true;
};


function compareDelta_(expected, actual, epsilon) {
  var compareDouble = function(e,a,d) {
    return Math.abs(e - a) <= d;
  }
  if (expected === actual) {
    return true;
  }

  if (typeof expected == "number" ||
      typeof actual == "number" ||
      !expected || !actual) {
    return compareDouble(expected, actual, epsilon);
  }

  if (isElement_(expected) || isElement_(actual)) {
    return false;
  }

  var key = null;
  var actualLength   = 0;
  var expectedLength = 0;

  try {
    // If an array is expected the length of actual should be simple to
    // determine. If it is not it is undefined.
    if (jstestdriver.jQuery.isArray(actual)) {
      actualLength = actual.length;
    } else {
      // In case it is an object it is a little bit more complicated to
      // get the length.
      for (key in actual) {
        if (actual.hasOwnProperty(key)) {
          ++actualLength;
        }
      }
    }

    // Arguments object
    if (actualLength == 0 && typeof actual.length == "number") {
      actualLength = actual.length;

      for (var i = 0, l = actualLength; i < l; i++) {
        if (!(i in actual)) {
          actualLength = 0;
          break;
        }
      }
    }

    for (key in expected) {
      if (expected.hasOwnProperty(key)) {
        if (!compareDelta_(expected[key], actual[key], epsilon)) {
          return false;
        }

        ++expectedLength;
      }
    }

    if (expectedLength != actualLength) {
      return false;
    }

    return expectedLength == 0 ? expected.toString() == actual.toString() : true;
  } catch (e) {
    return false;
  }
};