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

test/browser/snippets.js

Index: test/browser/snippets.js
===================================================================
--- a/test/browser/snippets.js
+++ b/test/browser/snippets.js
@@ -13,17 +13,17 @@
  *
  * 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 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: () => ""
   }
 };
 
@@ -233,8 +233,93 @@
   {
     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"><a href="foo"><div>Spon</div></a>Visit us</div></article>
+      <article id="article2"><div><a href="foo"><div>Spon</div></a>By this</div></article>
+      <article id="article3"><div><a href="foo"><div>by Writer</div></a> about the Sponsorship.</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");
+
+  await runSnippet(
+    test, "hide-if-contains-visible-text", "Spon", "#parent > article", "a"
+  );
+
+  element = document.getElementById("article");
+  expectHidden(test, element, "article");
+  element = document.getElementById("article2");
+  expectHidden(test, element, "article2");
+  element = document.getElementById("article3");
+  expectVisible(test, element, "article3");
+
+  test.done();
+};