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

test/browser/snippets.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * 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 library = require("../../lib/content/snippets.js");
-const {timeout} = require("./_utils");
+const {timeout, expectHidden, expectVisible} = require("./_utils");
 
 // We need this stub for the injector.
 window.browser = {
   runtime: {
     getURL: () => ""
   }
 };
 
 async function runSnippet(test, snippetName, ...args)
 {
@@ skipping 199 matching lines @@
 
   if (e && msg)
   {
     test.equals(e.textContent, "", "result element should be empty");
     test.equals(msg.textContent, "ReferenceError",
                 "There should have been an error");
   }
 
   test.done();
 };
+
+exports.testHideIfContainsVisibleText = async function(test)
+{
+  document.body.innerHTML = `  <style type="text/css">
+    body {
+      margin: 0;
+      padding: 0;
+    }
+    .transparent {
+      opacity: 0;
+      position: absolute;
+      display: block;
+    }
+    .zerosize {
+      font-size: 0;
+    }
+    div {
+      display: block;
+    }
+    .a {
+      display: inline-block;
+      white-space: pre-wrap;
+    }
+    .disp_none {
+      display: none;
+    }
+    .vis_hid {
+      visibility: hidden;
+    }
+    .vis_collapse {
+      visibility: collapse;
+    }
+    .same_colour {
+      color: rgb(255,255,255);
+      background-color: rgb(255,255,255);
+    }
+    #label {
+      overflow-wrap: break-word;
+    }
+  </style>
+    <div id="parent">
+       <div id="middle">
+         <div id="middle1"><div id="inside" class="inside"></div></div>
+       </div>
+       <div id="sibling">
+         <div id="tohide">to hide \ud83d\ude42!</div>
+       </div>
+       <div id="sibling2">
+         <div id="sibling21"><div id="sibling211" class="inside">Ad*</div></div>
+       </div>
+      <div id="label"><div id="content"><div class="a transparent">Sp</div><div class="a">Sp</div><div class="a zerosize">S</div><div class="a transparent">on</div><div class="a">on</div><div class="a zerosize">S</div></div></div>
+      <div id="label2"><div class="a vis_hid">Visibility: hidden</div><div class="a">S</div><div class="a vis_collapse">Visibility: collapse</div><div class="a">p</div><div class="a disp_none">Display: none</div><div class="a">o</div><div class="a same_colour">Same colour</div><div class="a">n</div></div>
+      <article id="article"><div style="display: none"><div>Spon</div></div></article>
+      <article id="article2"><div><div>Spon</div></div></article>
+    </div>`;
+
+  await runSnippet(
+    test, "hide-if-contains-visible-text", "Spon", "#parent > div"
+  );
+
+  let element = document.getElementById("label");
+  expectHidden(test, element, "label");
+  element = document.getElementById("label2");
+  expectHidden(test, element, "label2");
+
+  element = document.getElementById("article");
+  expectVisible(test, element, "article");
+  element = document.getElementById("article2");
+  expectVisible(test, element, "article2");
+
+  test.done();
+};