Issue 7450 - Implement hide-if-contains-visible-text snippet

test/browser/elemHideEmulation.js

Index: test/browser/elemHideEmulation.js
===================================================================
--- a/test/browser/elemHideEmulation.js
+++ b/test/browser/elemHideEmulation.js
@@ -14,17 +14,17 @@
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 "use strict";
 
 const {ElemHideEmulation, setTestMode,
        getTestInfo} = require("../../lib/content/elemHideEmulation");
-const {timeout} = require("./_utils");
+const {timeout, expectHidden, expectVisible} = require("./_utils");
 
 const REFRESH_INTERVAL = 200;
 
 let testDocument = null;
 
 exports.setUp = function(callback)
 {
   setTestMode();
@@ -46,38 +46,16 @@
 };
 
 function unexpectedError(test, error)
 {
   console.error(error);
   test.ok(false, "Unexpected error: " + error);
 }
 
-function expectHidden(test, element, id)
-{
-  let withId = "";
-  if (typeof id != "undefined")
-    withId = ` with ID '${id}'`;
-
-  test.equal(
-    window.getComputedStyle(element).display, "none",
-    `The element${withId}'s display property should be set to 'none'`);
-}
-
-function expectVisible(test, element, id)
-{
-  let withId = "";
-  if (typeof id != "undefined")
-    withId = ` with ID '${id}'`;
-
-  test.notEqual(
-    window.getComputedStyle(element).display, "none",
-    `The element${withId}'s display property should not be set to 'none'`);
-}
-
 function expectProcessed(test, element, id = null)
 {
   let withId = "";
   if (id)
     withId = ` with ID '${id}'`;
 
   test.ok(
     getTestInfo().lastProcessedElements.has(element),