auto_tests/tests/MoreAsserts.js

   1 // Copyright (c) 2011 Google, Inc.
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   9 //
  10 // The above copyright notice and this permission notice shall be included in
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  12 //
  13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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  19 // THE SOFTWARE.
  20
  21
  22 /**
  23  * @fileoverview Additional assertions.
  24  *
  25  * @author konigsberg@google.com (Robert Konigsberg)
  26  */
  27
  28 /**
  29  * Asserts that two doubles (or two arrays of doubles) are equal
  30  * to within a positive delta.
  31  */
  32 function assertEqualsDelta(msg, expected, actual, epsilon) {
  33   var args = this.argsWithOptionalMsg_(arguments, 4);
  34   jstestdriver.assertCount++;
  35   msg = args[0];
  36   expected = args[1];
  37   actual = args[2];
  38   epsilon = args[3];
  39
  40   if (!compareDelta_(expected, actual, epsilon)) {
  41     this.fail(msg + 'expected ' + epsilon + ' within ' +
  42               this.prettyPrintEntity_(expected) +
  43               ' but was ' + this.prettyPrintEntity_(actual) + '');
  44   }
  45   return true;
  46 };
  47
  48
  49 function compareDelta_(expected, actual, epsilon) {
  50   var compareDouble = function(e,a,d) {
  51     return Math.abs(e - a) <= d;
  52   }
  53   if (expected === actual) {
  54     return true;
  55   }
  56
  57   if (typeof expected == "number" ||
  58       typeof actual == "number" ||
  59       !expected || !actual) {
  60     return compareDouble(expected, actual, epsilon);
  61   }
  62
  63   if (isElement_(expected) || isElement_(actual)) {
  64     return false;
  65   }
  66
  67   var key = null;
  68   var actualLength   = 0;
  69   var expectedLength = 0;
  70
  71   try {
  72     // If an array is expected the length of actual should be simple to
  73     // determine. If it is not it is undefined.
  74     if (jstestdriver.jQuery.isArray(actual)) {
  75       actualLength = actual.length;
  76     } else {
  77       // In case it is an object it is a little bit more complicated to
  78       // get the length.
  79       for (key in actual) {
  80         if (actual.hasOwnProperty(key)) {
  81           ++actualLength;
  82         }
  83       }
  84     }
  85
  86     // Arguments object
  87     if (actualLength == 0 && typeof actual.length == "number") {
  88       actualLength = actual.length;
  89
  90       for (var i = 0, l = actualLength; i < l; i++) {
  91         if (!(i in actual)) {
  92           actualLength = 0;
  93           break;
  94         }
  95       }
  96     }
  97
  98     for (key in expected) {
  99       if (expected.hasOwnProperty(key)) {
 100         if (!compareDelta_(expected[key], actual[key], epsilon)) {
 101           return false;
 102         }
 103
 104         ++expectedLength;
 105       }
 106     }
 107
 108     if (expectedLength != actualLength) {
 109       return false;
 110     }
 111
 112     return expectedLength == 0 ? expected.toString() == actual.toString() : true;
 113   } catch (e) {
 114     return false;
 115   }
 116 };
 117