test: remove surplus test

exist-app/tests.xqm

@@ -226,13 +226,6 @@ function tests:html-creation($document as xs:string, $page as xs:string) as elem
 };
 
 
-declare
-    %test:assertExists
-function tests:compress-text() as xs:base64Binary {
-    tapi:compress-to-zip()
-};
-
-
 declare
     %test:args("ahiqar_sample")
     %test:assertEquals("text/xml")