The feed hears new posts as they come

decePub opens PrivaPub's streaming API (one WebSocket for the persona, its
token given as the socket's protocol, never in a URL) and subscribes to the
stream of the feed in view: home, a list, local, federated, a hashtag or
notifications. New posts wait behind the "new" button as polled ones did;
a deletion or an edit applies at once. Polling stays for the feeds PrivaPub
does not stream and for any feed while the socket is down, which opens again
after a pause growing to a minute. The e2e test sees a post made elsewhere
in seconds and its deletion take the card away.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

tests/e2e/Actions/StreamingTests.cs

@@ -0,0 +1,52 @@
+using System.Text.Json.Nodes;
+
+using decePubClient.E2E.Support;
+
+using Microsoft.Playwright;
+
+namespace decePubClient.E2E.Actions
+{
+	// The home feed hears of a new post and of its deletion through PrivaPub's streaming API, in seconds, where polling
+	// would take up to 45
+	public sealed class StreamingTests(Browser browser)
+	{
+		[Fact]
+		public async Task A_post_made_elsewhere_waits_behind_the_new_button_and_its_deletion_takes_it_away()
+		{
+			var persona = Pasture.Personas().First();
+			var text = $"streamed {Guid.NewGuid():N}"[..21];
+			await using var session = await SignIn.As(browser, persona);
+			var page = session.Page;
+			JsonNode post = null;
+			try
+			{
+				await Results.Cell("client.render.stream", "privapub", persona.UserName, async () =>
+				{
+					await page.GotoAsync($"{Pasture.Site}/");
+					await page.EvaluateAsync("() => localStorage.removeItem('FeedFilter')");
+					await page.GotoAsync($"{Pasture.Site}/");
+					await page.Locator("article[data-uri], [data-feed-empty]").First.WaitForAsync(new() { Timeout = 30000 });
+					// the stream opens once the first page is shown
+					await Task.Delay(1500);
+
+					post = await PersonaApi.Call(persona, "/api/v1/statuses", HttpMethod.Post, new JsonObject { ["status"] = text, ["visibility"] = "unlisted" });
+					var fresh = page.GetByRole(AriaRole.Button, new() { Name = "1 new" });
+					await fresh.WaitForAsync(new() { Timeout = 10000 });
+					await fresh.ClickAsync();
+					var card = page.Locator($"article[data-uri='{post!["uri"]!.GetValue<string>()}']");
+					await Assertions.Expect(card).ToContainTextAsync(text, new() { Timeout = 5000 });
+
+					await PersonaApi.Call(persona, $"/api/v1/statuses/{post["id"]!.GetValue<string>()}", HttpMethod.Delete);
+					post = null;
+					await Assertions.Expect(card).ToHaveCountAsync(0, new() { Timeout = 10000 });
+					await session.AssertGuards();
+				}, page);
+			}
+			finally
+			{
+				if (post is not null)
+					await PersonaApi.Call(persona, $"/api/v1/statuses/{post["id"]!.GetValue<string>()}", HttpMethod.Delete);
+			}
+		}
+	}
+}