Bug 1811130 - [cdp] Fix Target.setDiscoverTargets emitting targetCreated events with discover false r=webdriver-reviewers,whimboo

Target.setDiscoverTargets should only emit targetCreated events when ran
with discover as true. Also added tests for discover false.

Differential Revision: https://phabricator.services.mozilla.com/D167210

remote/cdp/domains/parent/Target.sys.mjs

@@ -99,14 +99,14 @@ export class Target extends Domain {
     if (discover) {
       targetList.on("target-created", this._onTargetCreated);
       targetList.on("target-destroyed", this._onTargetDestroyed);
+
+      for (const target of targetList) {
+        this._onTargetCreated("target-created", target);
+      }
     } else {
       targetList.off("target-created", this._onTargetCreated);
       targetList.off("target-destroyed", this._onTargetDestroyed);
     }
-
-    for (const target of targetList) {
-      this._onTargetCreated("target-created", target);
-    }
   }
 
   async createTarget(options = {}) {

remote/cdp/test/browser/target/browser_setDiscoverTargets.js

@@ -138,6 +138,45 @@ add_task(
   { createTab: false }
 );
 
+add_task(
+  async function noTargetsWithDiscoverFalse({ client }) {
+    const { Target } = client;
+
+    await loadURL(PAGE_TEST);
+
+    const targets = await getDiscoveredTargets(Target, { discover: false });
+    is(targets.length, 0, "Got 0 targets with discover false");
+  },
+  { createTab: false }
+);
+
+add_task(
+  async function noEventsWithDiscoverFalse({ client }) {
+    const { Target } = client;
+
+    await loadURL(PAGE_TEST);
+
+    const targets = [];
+    const unsubscribe = Target.targetCreated(target => {
+      targets.push(target.targetInfo);
+    });
+
+    await Target.setDiscoverTargets({
+      discover: false,
+    });
+
+    // Cannot use openTab() helper as it relies on the event
+    await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+    // Wait 1s for the event to possibly dispatch
+    await timeoutPromise(1000);
+
+    unsubscribe();
+    is(targets.length, 0, "Got 0 target created events with discover false");
+  },
+  { createTab: false }
+);
+
 add_task(
   async function targetInfoValues({ client }) {
     const { Target, target } = client;