API: yuitest ArrayAssert.js (YUI Library)

# Yahoo! UI Library

### yuitest 2.8.1

Yahoo! UI Library > yuitest > ArrayAssert.js (source view)
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    //-----------------------------------------------------------------------------
    // ArrayAssert object
    //-----------------------------------------------------------------------------

    /**
     * The ArrayAssert object provides functions to test JavaScript array objects
     * for a variety of cases.
     *
     * @namespace YAHOO.util
     * @class ArrayAssert
     * @static
     */

    YAHOO.util.ArrayAssert = {

        /**
         * Asserts that a value is present in an array. This uses the triple equals
         * sign so no type cohersion may occur.
         * @param {Object} needle The value that is expected in the array.
         * @param {Array} haystack An array of values.
         * @param {String} message (Optional) The message to display if the assertion fails.
         * @method contains
         * @static
         */
        contains : function (needle /*:Object*/, haystack /*:Array*/,
                               message /*:String*/) /*:Void*/ {

            var found /*:Boolean*/ = false;
            var Assert = YAHOO.util.Assert;

            //begin checking values
            for (var i=0; i < haystack.length && !found; i++){
                if (haystack[i] === needle) {
                    found = true;
                }
            }

            if (!found){
                Assert.fail(Assert._formatMessage(message, "Value " + needle + " (" + (typeof needle) + ") not found in array [" + haystack + "]."));
            }
        },

        /**
         * Asserts that a set of values are present in an array. This uses the triple equals
         * sign so no type cohersion may occur. For this assertion to pass, all values must
         * be found.
         * @param {Object[]} needles An array of values that are expected in the array.
         * @param {Array} haystack An array of values to check.
         * @param {String} message (Optional) The message to display if the assertion fails.
         * @method containsItems
         * @static
         */
        containsItems : function (needles /*:Object[]*/, haystack /*:Array*/,
                               message /*:String*/) /*:Void*/ {

            //begin checking values
            for (var i=0; i < needles.length; i++){
                this.contains(needles[i], haystack, message);
            }
        },

        /**
         * Asserts that a value matching some condition is present in an array. This uses
         * a function to determine a match.
         * @param {Function} matcher A function that returns true if the items matches or false if not.
         * @param {Array} haystack An array of values.
         * @param {String} message (Optional) The message to display if the assertion fails.
         * @method containsMatch
         * @static
         */
        containsMatch : function (matcher /*:Function*/, haystack /*:Array*/,
                               message /*:String*/) /*:Void*/ {

            //check for valid matcher
            if (typeof matcher != "function"){
                throw new TypeError("ArrayAssert.containsMatch(): First argument must be a function.");
            }

            var found /*:Boolean*/ = false;
            var Assert = YAHOO.util.Assert;

            //begin checking values
            for (var i=0; i < haystack.length && !found; i++){
                if (matcher(haystack[i])) {
                    found = true;
                }
            }

            if (!found){
                Assert.fail(Assert._formatMessage(message, "No match found in array [" + haystack + "]."));
            }
        },

        /**
         * Asserts that a value is not present in an array. This uses the triple equals
         * sign so no type cohersion may occur.
         * @param {Object} needle The value that is expected in the array.
         * @param {Array} haystack An array of values.
         * @param {String} message (Optional) The message to display if the assertion fails.
         * @method doesNotContain
         * @static
         */
        doesNotContain : function (needle /*:Object*/, haystack /*:Array*/,
                               message /*:String*/) /*:Void*/ {

            var found /*:Boolean*/ = false;
            var Assert = YAHOO.util.Assert;

            //begin checking values
            for (var i=0; i < haystack.length && !found; i++){
                if (haystack[i] === needle) {
                    found = true;
                }
            }

            if (found){
                Assert.fail(Assert._formatMessage(message, "Value found in array [" + haystack + "]."));
            }
        },

        /**
         * Asserts that a set of values are not present in an array. This uses the triple equals
         * sign so no type cohersion may occur. For this assertion to pass, all values must
         * not be found.
         * @param {Object[]} needles An array of values that are not expected in the array.
         * @param {Array} haystack An array of values to check.
         * @param {String} message (Optional) The message to display if the assertion fails.
         * @method doesNotContainItems
         * @static
         */
        doesNotContainItems : function (needles /*:Object[]*/, haystack /*:Array*/,
                               message /*:String*/) /*:Void*/ {

            for (var i=0; i < needles.length; i++){
                this.doesNotContain(needles[i], haystack, message);
            }

        },

        /**
         * Asserts that no values matching a condition are present in an array. This uses
         * a function to determine a match.
         * @param {Function} matcher A function that returns true if the items matches or false if not.
         * @param {Array} haystack An array of values.
         * @param {String} message (Optional) The message to display if the assertion fails.
         * @method doesNotContainMatch
         * @static
         */
        doesNotContainMatch : function (matcher /*:Function*/, haystack /*:Array*/,
                               message /*:String*/) /*:Void*/ {

            //check for valid matcher
            if (typeof matcher != "function"){
                throw new TypeError("ArrayAssert.doesNotContainMatch(): First argument must be a function.");
            }

            var found /*:Boolean*/ = false;
            var Assert = YAHOO.util.Assert;

            //begin checking values
            for (var i=0; i < haystack.length && !found; i++){
                if (matcher(haystack[i])) {
                    found = true;
                }
            }

            if (found){
                Assert.fail(Assert._formatMessage(message, "Value found in array [" + haystack + "]."));
            }
        },

        /**
         * Asserts that the given value is contained in an array at the specified index.
         * This uses the triple equals sign so no type cohersion will occur.
         * @param {Object} needle The value to look for.
         * @param {Array} haystack The array to search in.
         * @param {int} index The index at which the value should exist.
         * @param {String} message (Optional) The message to display if the assertion fails.
         * @method indexOf
         * @static
         */
        indexOf : function (needle /*:Object*/, haystack /*:Array*/, index /*:int*/, message /*:String*/) /*:Void*/ {

            //try to find the value in the array
            for (var i=0; i < haystack.length; i++){
                if (haystack[i] === needle){
                    YAHOO.util.Assert.areEqual(index, i, message || "Value exists at index " + i + " but should be at index " + index + ".");
                    return;
                }
            }

            var Assert = YAHOO.util.Assert;

            //if it makes it here, it wasn't found at all
            Assert.fail(Assert._formatMessage(message, "Value doesn't exist in array [" + haystack + "]."));
        },

        /**
         * Asserts that the values in an array are equal, and in the same position,
         * as values in another array. This uses the double equals sign
         * so type cohersion may occur. Note that the array objects themselves
         * need not be the same for this test to pass.
         * @param {Array} expected An array of the expected values.
         * @param {Array} actual Any array of the actual values.
         * @param {String} message (Optional) The message to display if the assertion fails.
         * @method itemsAreEqual
         * @static
         */
        itemsAreEqual : function (expected /*:Array*/, actual /*:Array*/,
                               message /*:String*/) /*:Void*/ {

            //one may be longer than the other, so get the maximum length
            var len /*:int*/ = Math.max(expected.length, actual.length || 0);
            var Assert = YAHOO.util.Assert;

            //begin checking values
            for (var i=0; i < len; i++){
                Assert.areEqual(expected[i], actual[i],
                    Assert._formatMessage(message, "Values in position " + i + " are not equal."));
            }
        },

        /**
         * Asserts that the values in an array are equivalent, and in the same position,
         * as values in another array. This uses a function to determine if the values
         * are equivalent. Note that the array objects themselves
         * need not be the same for this test to pass.
         * @param {Array} expected An array of the expected values.
         * @param {Array} actual Any array of the actual values.
         * @param {Function} comparator A function that returns true if the values are equivalent
         *      or false if not.
         * @param {String} message (Optional) The message to display if the assertion fails.
         * @return {Void}
         * @method itemsAreEquivalent
         * @static
         */
        itemsAreEquivalent : function (expected /*:Array*/, actual /*:Array*/,
                               comparator /*:Function*/, message /*:String*/) /*:Void*/ {

            //make sure the comparator is valid
            if (typeof comparator != "function"){
                throw new TypeError("ArrayAssert.itemsAreEquivalent(): Third argument must be a function.");
            }

            //one may be longer than the other, so get the maximum length
            var len /*:int*/ = Math.max(expected.length, actual.length || 0);

            //begin checking values
            for (var i=0; i < len; i++){
                if (!comparator(expected[i], actual[i])){
                    throw new YAHOO.util.ComparisonFailure(YAHOO.util.Assert._formatMessage(message, "Values in position " + i + " are not equivalent."), expected[i], actual[i]);
                }
            }
        },

        /**
         * Asserts that an array is empty.
         * @param {Array} actual The array to test.
         * @param {String} message (Optional) The message to display if the assertion fails.
         * @method isEmpty
         * @static
         */
        isEmpty : function (actual /*:Array*/, message /*:String*/) /*:Void*/ {
            if (actual.length > 0){
                var Assert = YAHOO.util.Assert;
                Assert.fail(Assert._formatMessage(message, "Array should be empty."));
            }
        },

        /**
         * Asserts that an array is not empty.
         * @param {Array} actual The array to test.
         * @param {String} message (Optional) The message to display if the assertion fails.
         * @method isNotEmpty
         * @static
         */
        isNotEmpty : function (actual /*:Array*/, message /*:String*/) /*:Void*/ {
            if (actual.length === 0){
                var Assert = YAHOO.util.Assert;
                Assert.fail(Assert._formatMessage(message, "Array should not be empty."));
            }
        },

        /**
         * Asserts that the values in an array are the same, and in the same position,
         * as values in another array. This uses the triple equals sign
         * so no type cohersion will occur. Note that the array objects themselves
         * need not be the same for this test to pass.
         * @param {Array} expected An array of the expected values.
         * @param {Array} actual Any array of the actual values.
         * @param {String} message (Optional) The message to display if the assertion fails.
         * @method itemsAreSame
         * @static
         */
        itemsAreSame : function (expected /*:Array*/, actual /*:Array*/,
                              message /*:String*/) /*:Void*/ {

            //one may be longer than the other, so get the maximum length
            var len /*:int*/ = Math.max(expected.length, actual.length || 0);
            var Assert = YAHOO.util.Assert;

            //begin checking values
            for (var i=0; i < len; i++){
                Assert.areSame(expected[i], actual[i],
                    Assert._formatMessage(message, "Values in position " + i + " are not the same."));
            }
        },

        /**
         * Asserts that the given value is contained in an array at the specified index,
         * starting from the back of the array.
         * This uses the triple equals sign so no type cohersion will occur.
         * @param {Object} needle The value to look for.
         * @param {Array} haystack The array to search in.
         * @param {int} index The index at which the value should exist.
         * @param {String} message (Optional) The message to display if the assertion fails.
         * @method lastIndexOf
         * @static
         */
        lastIndexOf : function (needle /*:Object*/, haystack /*:Array*/, index /*:int*/, message /*:String*/) /*:Void*/ {

            var Assert = YAHOO.util.Assert;

            //try to find the value in the array
            for (var i=haystack.length; i >= 0; i--){
                if (haystack[i] === needle){
                    Assert.areEqual(index, i, Assert._formatMessage(message, "Value exists at index " + i + " but should be at index " + index + "."));
                    return;
                }
            }

            //if it makes it here, it wasn't found at all
            Assert.fail(Assert._formatMessage(message, "Value doesn't exist in array."));
        }

    };

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