TEST Adds acceptance test for Wait Until Page Does Not Contain

Author: deiga

test/acceptance/keywords/waiting.txt

@@ -12,6 +12,10 @@ Wait Until Page Contains
     Wait Until Page Contains  New Content  2 s
     Run Keyword And Expect Error  Text 'invalid' did not appear in 100 milliseconds  Wait Until Page Contains  invalid  0.1
 
+Wait Until Page Does Not Contain
+    Wait Until Page Does Not Contain  This is content  2 s
+    Run Keyword And Expect Error  Text 'Inititally hidden' did not disappear in 100 milliseconds  Wait Until Page Does Not Contain  Inititally hidden  0.1
+
 Wait Until Page Contains Element
     [Documentation]  Tests also that format characters (e.g. %c) are handled correctly in error messages
     Wait Until Page Contains Element  new div  2 seconds