Fixed/enhanced unit tests for filterHtml() in Sandbox API
Fixed/enhanced unit tests for filterHtml() in Sandbox API

Fixed: I was using the undefined function getAttributeValue() instead of
getAttribute().

Enhanced: I added an assertion before a unit test to check that the initial
value matches expectations, I added a test on 'lang' attribute added to element
without language.

eric-brechemier/lb_js_scalableApp,eric-brechemier/lb_js_scalableApp,eric-brechemier/lb_js_scalableApp