Bug 1070751 - [system] unit test refactoring for new version chai.assert api

test_agent used very old version chai library version=0.5.3
in the current version=1.9.1 deepEqual take prototype into consideration
 old chai version OK in anything throw, not check message!!, new chai check message - this message in tested source file! 


Mon, 22 Sep 2014 05:09:13 -0700 от Julien Wajsberg <notifications@github.com>:
>In apps/system/test/unit/ftu_ping_test.js:
>> @@ -306,7 +306,7 @@ suite('FtuPing', function() {
>            .returns(false);
>        MockNavigatorMozMobileConnections.mAddMobileConnection();
>        assert.throw(function() { FtuPing.checkMobileNetwork(); },
> -                   /No mobile connections/);
> +                   /No unlocked or active SIM cards found/);
>these changes do not look chai-related. Do you know why this is needed?
>—
>Reply to this email directly or  view it on GitHub .

С уважением, Волков Вячеслав!