Bug 1585582 - Set appcache prefs on before start to prevent races in tests. r=baku

Differential Revision: https://phabricator.services.mozilla.com/D47977

--HG--
extra : moz-landing-system : lando

browser/base/content/test/sanitize/browser.ini

@@ -3,6 +3,9 @@ support-files=
   head.js
   dummy.js
   dummy_page.html
+prefs=
+  browser.cache.offline.enable=true
+  browser.cache.offline.storage.enable=true
 
 [browser_purgehistory_clears_sh.js]
 [browser_sanitize-formhistory.js]

browser/base/content/test/sanitize/browser_sanitizeDialog.js

@@ -490,8 +490,6 @@ add_task(async function test_form_entries() {
 
 // Test for offline cache deletion
 add_task(async function test_offline_cache() {
-  Services.prefs.setBoolPref("browser.cache.offline.enable", true);
-  Services.prefs.setBoolPref("browser.cache.offline.storage.enable", true);
   // Prepare stuff, we will work with www.example.com
   var URL = "http://www.example.com";
   var URI = makeURI(URL);
@@ -570,8 +568,6 @@ add_task(async function test_offline_cache() {
     cacheListener
   );
   await wh.promiseClosed;
-  Services.prefs.clearUserPref("browser.cache.offline.enable");
-  Services.prefs.clearUserPref("browser.cache.offline.storage.enable");
 });
 
 // Test for offline apps permission deletion

testing/profiles/web-platform/user.js

@@ -40,3 +40,7 @@ user_pref("dom.animations-api.implicit-keyframes.enabled", true);
 // sometime wpt runs test even before the document becomes visible, which would
 // delay video.play() and cause play() running in wrong order.
 user_pref("media.block-autoplay-until-in-foreground", false);
+user_pref("media.block-autoplay-until-in-foreground", false);
+// Enable AppCache globally for now whilst it's being removed in Bug 1584984
+user_pref("browser.cache.offline.storage.enable", true);
+user_pref("browser.cache.offline.enable", true);

toolkit/forgetaboutsite/test/unit/test_removeDataFromDomain.js

@@ -406,8 +406,6 @@ async function test_push_cleared() {
   const { PushService } = serviceExports;
   const userAgentID = "bd744428-f125-436a-b6d0-dd0c9845837f";
   const channelID = "0ef2ad4a-6c49-41ad-af6e-95d2425276bf";
-  Services.prefs.setBoolPref("browser.cache.offline.storage.enable", true);
-  Services.prefs.setBoolPref("browser.cache.offline.enable", true);
 
   let db = PushServiceWebSocket.newPushDB();
 
@@ -557,11 +555,19 @@ var tests = [
 
   // Storage
   test_storage_cleared,
-
-  // Cache
-  test_cache_cleared,
 ];
 
+// Cache
+//
+// Due to these prefs being static, setting them doesn't make a difference in time for the test
+// As we are removing AppCache in Bug 1584984 this will just be removed soon.
+if (
+  Services.prefs.getBoolPref("browser.cache.offline.enable") &&
+  Services.prefs.getBoolPref("browser.cache.offline.storage.enable")
+) {
+  tests.push(test_cache_cleared);
+}
+
 function run_test() {
   for (let i = 0; i < tests.length; i++) {
     add_task(tests[i]);

toolkit/forgetaboutsite/test/unit/xpcshell.ini

@@ -1,5 +1,4 @@
 [DEFAULT]
-prefs = [browser.cache.offline.enable = true, browser.cache.offline.storage.enable=true]
 head = head_forgetaboutsite.js ../../../../dom/push/test/xpcshell/head.js
 skip-if = toolkit == 'android'
 support-files =