snapshot of https://github.com/jitsi/jitsi-meet.git @ fd1749dd28f4138aa80234fc7f311b19aaffa0e7 (2026-09-15)

tests/specs/media/lastN.spec.ts

@@ -0,0 +1,78 @@
+import { setTestProperties } from '../../helpers/TestProperties';
+import { ensureFourParticipants, ensureThreeParticipants, ensureTwoParticipants } from '../../helpers/participants';
+
+setTestProperties(__filename, {
+    usesBrowsers: [ 'p1', 'p2', 'p3', 'p4' ]
+});
+
+describe('LastN', () => {
+    it('joining the meeting', async () => {
+        await ensureTwoParticipants({
+            configOverwrite: {
+                startWithAudioMuted: true,
+                startWithVideoMuted: true,
+                channelLastN: 1
+            },
+            skipInMeetingChecks: true
+        });
+
+        await ensureThreeParticipants({
+            configOverwrite: {
+                channelLastN: 1
+            },
+            skipInMeetingChecks: true,
+        });
+    });
+
+    it('checks', async () => {
+        const { p3 } = ctx;
+        const p3Toolbar = p3.getToolbar();
+
+        await p3.waitForSendMedia();
+
+        await ctx.p1.waitForRemoteVideo(await p3.getEndpointId());
+
+        // Mute audio on participant3.
+        await p3Toolbar.clickAudioMuteButton();
+
+        await ensureFourParticipants({
+            configOverwrite: {
+                channelLastN: 1
+            },
+            skipInMeetingChecks: true
+        });
+
+        const { p1, p2, p4 } = ctx;
+
+        await p4.waitForSendReceiveData();
+
+        // Mute audio on p4 and unmute p3.
+        await p4.getToolbar().clickAudioMuteButton();
+        await p3Toolbar.clickAudioUnmuteButton();
+
+        const p4EndpointId = await p4.getEndpointId();
+        const p3EndpointId = await p3.getEndpointId();
+
+        // Check if p1 starts receiving video from p3 and p4 shows up as ninja.
+        await p1.waitForNinjaIcon(p4EndpointId);
+        await p1.waitForRemoteVideo(p3EndpointId);
+
+        // At this point, mute video of p3 and others should be receiving p4's video.
+        // Mute p1's video
+        await p3Toolbar.clickVideoMuteButton();
+        await p3.getParticipantsPane().assertVideoMuteIconIsDisplayed(p3);
+        await p1.getParticipantsPane().assertVideoMuteIconIsDisplayed(p3);
+        await p1.waitForRemoteVideo(p4EndpointId);
+
+        // Unmute p3's video and others should switch to receiving p3's video.
+        await p3Toolbar.clickVideoUnmuteButton();
+        await p1.waitForRemoteVideo(p3EndpointId);
+        await p1.waitForNinjaIcon(p4EndpointId);
+
+        // Mute p3's audio and unmute p2's audio. Other endpoints should continue to receive video from p3
+        // even though p2 is the dominant speaker.
+        await p3Toolbar.clickAudioMuteButton();
+        await p2.getToolbar().clickAudioUnmuteButton();
+        await p1.waitForRemoteVideo(p3EndpointId);
+    });
+});