This is a Browser Action API.
_assertContainsText will assert that an element contains the given text
_assertContainsText will log failures to the playback logs if the condition evaluates to false.
DO NOT USE THIS IN AN IF CONDITION as it does not return any value, and throws an exception if the condition is false
_assertContainsText(expectedText, element, message)
The parameters are:
_assertContainsText("Invalid Login", _div("login_section"), "Text was not present");
_assertContainsText(/[Ii]nvalid/, _div("login_section"), "Text was not present");
_assertContainsText("Invalid Login", _div("login_section"));
_assertContainsText(/[Ii]nvalid/, _div("login_section"));