Marcotmp
Marcotmp

Reputation: 71

What is the right way to compare as3 objects using hamcrest

I'm trying to compare two objects to see if they are the same using hamcrest for flex-unit, but when the object has sub objects, it just throws an error:

Error: Expected: (An array containing <[object Object]>
but: an array containing <[object Object]> was <[object Object]>

I want it to do an assertThat(..., hasProperties(...)); on the sub object.

Is there a way to get that or should i create a custom matcher?

EDIT

An example of the object structure i want to test:

var expected:Object = {
    number:1.3,
    array:[{
        prop1:"val1", prop2:"val2"
    }]
    anObject:{
        propA:1, propB:2
    },
}

var objectUnderTest:Object = {
    number:1.3,
    array:[{
        prop1:"val1", prop2:"val2"
    }]
    anObject:{
        propA:1, propB:2
    },
}

assertThat("should be the same", objectUnderTest, hasProperties(expected));

since the expected and objectUnderTest have the same structure, the test should pass, but is returning the error:

Error: Expected: (An array containing <[object Object]>
but: an array containing <[object Object]> was <[object Object]>

Also, if there is a way to compare two JSON strings will be fine too.

EDIT2

This is my final version after djib help:

package com
{
    public function assertEqualsObjects(message:String, object1:Object, object2:Object):Boolean
    {
        // we have to run it both ways (1-2, 2-1)
        return (compare(object1, object2, message + ": object") && compare(object2, object1, message + ": extra"));
    }
}

import org.flexunit.asserts.fail;

function compare(object1:Object, object2:Object, parent:String):Boolean
{
    var count:int = 0;

    for (var s:String in object1)
    {
        count ++;
        if (!object2.hasOwnProperty(s))
        {
            fail(parent + "." + s + " expected: " + object1[s] + " but was: undefined");
            return false;
        }
        if (!compare(object1[s], object2[s], parent + "." + s))
        {
            fail(parent + "." + s + " expected: " + object1[s] + " but was: " + object2[s]);
            return false;
        }
    }

    if (count == 0 && object1 != object2) // if object has no properties, compare their actual values
    {
        fail(parent + " expected: " + object1 + " but was: " + object2);
        return false;
    }

    return true;
}

Upvotes: 0

Views: 1541

Answers (1)

djib
djib

Reputation: 646

I've put this code together. Recursion is the key ^^

        // our two objects to compare ...
        var obj1 = {
            number:1.3,
            array:[{prop1:"val1", prop2:"val2"}],
            anObject:{propA:1, propB:2}
        };

        var obj2 = {
            number:1.3,
            array:[{prop1:"val1", prop2:"val2"}],
            anObject:{propA:1, propB:2}
        };

        trace(isSame(obj1, obj2)); // -> true


    function isSame(object1:Object, object2:Object):Boolean
    {
        // we have to run it both ways (1-2, 2-1)
        return (compare(object1, object2) && compare(object2, object1));
    }

    function compare(object1:Object, object2:Object):Boolean
    {
        var count:int = 0;

        for (var s:String in object1)
        {
            count ++;
            if (object2[s] == undefined)
                return false;
            if (!compare(object1[s], object2[s]))
                return false;
        }

        if (count == 0 && object1 != object2) // if object has no properties, compare their actual values
        return false;

        return true;
    }

Upvotes: 0

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