Bug 1650510 - Wait for requests to settle in all browser_aboutdebugging_addons_debug_* tests r=daisuke

Depends on D82362

Differential Revision: https://phabricator.services.mozilla.com/D82363

devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_console.js

@@ -82,5 +82,8 @@ async function toolboxTestScript(toolbox, devtoolsTab) {
   hud.ui.wrapper.dispatchEvaluateExpression("myWebExtensionAddonFunction()");
   await onMessage;
 
+  info("Wait for all pending requests to settle on the DevToolsClient");
+  await toolbox.target.client.waitForRequestsToSettle();
+
   await removeTab(devtoolsTab);
 }

devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_inspector.js

@@ -78,5 +78,8 @@ async function toolboxTestScript(toolbox, devtoolsTab) {
     "nodeActor has the expected inlineTextChild value"
   );
 
+  info("Wait for all pending requests to settle on the DevToolsClient");
+  await toolbox.target.client.waitForRequestsToSettle();
+
   await removeTab(devtoolsTab);
 }

devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_nobg.js

@@ -87,5 +87,8 @@ async function toolboxTestScript(toolbox, devtoolsTab) {
     "nodeActor has the expected inlineTextChild value"
   );
 
+  info("Wait for all pending requests to settle on the DevToolsClient");
+  await toolbox.target.client.waitForRequestsToSettle();
+
   await removeTab(devtoolsTab);
 }