Bug 1572271 - Part 1: Force a GC during the cleanup of antitracking tests since there is not enough idle time between these tests for GCs to kick in naturally; r=baku

This prevents a whole host of OOM issues from occurring intermittently
when running these tests.

Differential Revision: https://phabricator.services.mozilla.com/D42654

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

toolkit/components/antitracking/test/browser/antitracking_head.js

@@ -9,6 +9,18 @@
 
 var gFeatures = undefined;
 
+/**
+ * Force garbage collection.
+ */
+function forceGC() {
+  SpecialPowers.gc();
+  SpecialPowers.forceShrinkingGC();
+  SpecialPowers.forceCC();
+  SpecialPowers.gc();
+  SpecialPowers.forceShrinkingGC();
+  SpecialPowers.forceCC();
+}
+
 this.AntiTracking = {
   runTestInNormalAndPrivateMode(
     name,
@@ -605,6 +617,10 @@ this.AntiTracking = {
       if (cleanupFunction) {
         await cleanupFunction();
       }
+
+      // While running these tests we typically do not have enough idle time to do
+      // GC reliably, so force it here.
+      forceGC();
     });
   },
 

toolkit/components/antitracking/test/browser/dynamicfpi_head.js

@@ -120,6 +120,11 @@ this.DynamicFPIHelper = {
       if (cleanupFunction) {
         await cleanupFunction();
       }
+
+      // While running these tests we typically do not have enough idle time to do
+      // GC reliably, so force it here.
+      /* import-globals-from antitracking_head.js */
+      forceGC();
     });
   },
 };

toolkit/components/antitracking/test/browser/partitionedstorage_head.js

@@ -335,6 +335,11 @@ this.PartitionedStorageHelper = {
       if (cleanupFunction) {
         await cleanupFunction();
       }
+
+      // While running these tests we typically do not have enough idle time to do
+      // GC reliably, so force it here.
+      /* import-globals-from antitracking_head.js */
+      forceGC();
     });
   },
 };

toolkit/components/antitracking/test/browser/storageprincipal_head.js

@@ -123,6 +123,11 @@ this.StoragePrincipalHelper = {
         await cleanupFunction();
       }
       UrlClassifierTestUtils.cleanupTestTrackers();
+
+      // While running these tests we typically do not have enough idle time to do
+      // GC reliably, so force it here.
+      /* import-globals-from antitracking_head.js */
+      forceGC();
     });
   },
 };