End-to-end tests against the pasture; profiles, follows, search, votes, reactions

tests/e2e (Playwright for .NET 1.61.0 on xunit v3, the Chromium 1228 already
cached, never downloaded, never in CI) runs the published app against
SocialPub's pasture and its town: run.sh publishes it with the Pasture
environment (wwwroot/appsettings.Pasture.json, published only then; the
deploy fails if it ever ships) and serves it as https://decepub.test. The
tests sign in through the real login page and persona chooser, check that
every request goes only to decepub.test and privapub.test with the right
credential on the right API, render one post of each kind from each
platform as its author wrote it, and check every action on the other
side of the wire (town.sh stored): favourites, boosts and replies with
their undoing, follows from a profile, votes, reactions. Each test is also
a cell of the town's report (out/client.jsonl). They found two PrivaPub
bugs fixed there (a blocked author's status answered null; sensitive
remote media invented a content warning) and a reply addressed to nobody.

New in the app, all checked by those tests:
- profiles at /account/{id}: header, bio, fields, counts, the account's
  posts as posts, posts and replies, or media, and follow, unfollow,
  cancel a request, mute and block (AccountService); post authors and
  notifications open them in the app;
- search at /search: accounts, posts and hashtags, a handle or an address
  resolved by PrivaPub;
- poll voting on the card, and emoji reactions shown and given with one
  tap; before a persona's first reaction or vote it is told once that
  both are public (PublicNoticeService, the owner's decision);
- follow requests answered from their notification.

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

tests/e2e/Actions/ActionMatrixTests.cs

@@ -0,0 +1,160 @@
+using System.Text.Json.Nodes;
+
+using decePubClient.E2E.Support;
+
+using Microsoft.Playwright;
+
+namespace decePubClient.E2E.Actions
+{
+	// What a reader does to a post from each platform, done in decePub and checked on the post's own server: a favourite
+	// and a boost arrive there (and leave when undone), a reply lands under the post and is gone once deleted. town.sh
+	// stored reads the origin's database, so nothing here trusts decePub's own view of what it did.
+	public sealed class ActionMatrixTests(Browser browser)
+	{
+		static readonly Lazy<JsonArray> Expected = new(() => Pasture.Town("expect").GetAwaiter().GetResult().AsArray());
+
+		public static TheoryData<string, string> Targets()
+		{
+			var data = new TheoryData<string, string>();
+			var personas = Pasture.Personas().Select(p => p.UserName).ToHashSet();
+			foreach (var origin in new[] { "gts", "mastodon", "misskey", "sharkey", "akkoma", "lemmy" })
+			{
+				var item = Expected.Value.FirstOrDefault(i => i!["origin"]!.GetValue<string>() == origin
+					&& i["visibility"]!.GetValue<string>() is "public" or "community"
+					&& i["readers"]!.AsArray().Any(r => personas.Contains(r!.GetValue<string>())));
+				if (item is not null)
+					data.Add(origin, item["ref"]!.GetValue<string>());
+			}
+			return data;
+		}
+
+		static (JsonNode Item, Pasture.Persona Reader) Target(string reference)
+		{
+			var item = Expected.Value.First(i => i!["ref"]!.GetValue<string>() == reference)!;
+			var personas = Pasture.Personas();
+			var reader = item["readers"]!.AsArray().Select(r => personas.FirstOrDefault(p => p.UserName == r!.GetValue<string>()))
+				.First(p => p is not null);
+			return (item, reader);
+		}
+
+		static async Task<int> Count(string origin, string uri, string field)
+		{
+			var row = (await Pasture.Stored(origin, uri))[uri]!;
+			return row[field]?.GetValue<int?>() ?? 0;
+		}
+
+		static async Task<bool> IsActive(ILocator button) =>
+			((await button.GetAttributeAsync("class")) ?? "").Split(' ').Contains("btn-active");
+
+		async Task<(Session Session, ILocator Card)> Open(JsonNode item, Pasture.Persona reader)
+		{
+			var session = await SignIn.As(browser, reader);
+			await session.Page.GotoAsync($"{Pasture.Site}/expand/{item["id"]!.GetValue<string>()}");
+			var card = session.Page.Locator($"article[data-uri='{item["uri"]!.GetValue<string>()}']").First;
+			await card.WaitForAsync(new() { Timeout = 30000 });
+			return (session, card);
+		}
+
+		[Theory]
+		[MemberData(nameof(Targets))]
+		public async Task A_favourite_reaches_the_author_and_its_undo_too(string origin, string reference)
+		{
+			var (item, reader) = Target(reference);
+			var uri = item["uri"]!.GetValue<string>();
+			await Results.Cell("client.action.favourite", origin, reference, async () =>
+			{
+				var (session, card) = await Open(item, reader);
+				await using var _ = session;
+				var favourite = card.Locator("footer button[title='Favourite']").First;
+				// the town may have done it already as this persona: start from the undone state
+				if (await IsActive(favourite))
+				{
+					var done = await Count(origin, uri, "likes");
+					await favourite.ClickAsync();
+					await Pasture.Eventually(async () => await Count(origin, uri, "likes") < done, 60);
+					await Assertions.Expect(favourite).Not.ToHaveClassAsync(new System.Text.RegularExpressions.Regex("btn-active"));
+				}
+				var before = await Count(origin, uri, "likes");
+				await favourite.ClickAsync();
+				Assert.True(await Pasture.Eventually(async () => await Count(origin, uri, "likes") > before),
+					$"the favourite never reached {origin}");
+				await favourite.ClickAsync();
+				Assert.True(await Pasture.Eventually(async () => await Count(origin, uri, "likes") == before, 60),
+					$"undoing the favourite never reached {origin}");
+				await session.AssertGuards();
+			});
+		}
+
+		[Theory]
+		[MemberData(nameof(Targets))]
+		public async Task A_boost_reaches_the_author_and_its_undo_too(string origin, string reference)
+		{
+			Assert.SkipWhen(origin == "lemmy", "Lemmy keeps no boosts of a thread");
+			var (item, reader) = Target(reference);
+			var uri = item["uri"]!.GetValue<string>();
+			await Results.Cell("client.action.boost", origin, reference, async () =>
+			{
+				var (session, card) = await Open(item, reader);
+				await using var _ = session;
+				var boost = card.Locator("footer button[title='Boost']").First;
+				// the town may have done it already as this persona: start from the undone state
+				if (await IsActive(boost))
+				{
+					var done = await Count(origin, uri, "boosts");
+					await boost.ClickAsync();
+					await Pasture.Eventually(async () => await Count(origin, uri, "boosts") < done, 60);
+					await Assertions.Expect(boost).Not.ToHaveClassAsync(new System.Text.RegularExpressions.Regex("btn-active"));
+				}
+				var before = await Count(origin, uri, "boosts");
+				await boost.ClickAsync();
+				Assert.True(await Pasture.Eventually(async () => await Count(origin, uri, "boosts") > before),
+					$"the boost never reached {origin}");
+				await boost.ClickAsync();
+				Assert.True(await Pasture.Eventually(async () => await Count(origin, uri, "boosts") == before, 60),
+					$"undoing the boost never reached {origin}");
+				await session.AssertGuards();
+			});
+		}
+
+		[Theory]
+		[MemberData(nameof(Targets))]
+		public async Task A_reply_lands_under_the_post_and_its_delete_removes_it(string origin, string reference)
+		{
+			var (item, reader) = Target(reference);
+			var uri = item["uri"]!.GetValue<string>();
+			await Results.Cell("client.action.reply", origin, reference, async () =>
+			{
+				var (session, card) = await Open(item, reader);
+				await using var _ = session;
+				await card.Locator("footer button[title='Reply']").First.ClickAsync();
+				var text = $"an e2e reply to {reference} ({Guid.NewGuid():N})";
+				// after the @names the composer prefills, as a reader types
+				var box = card.Locator("textarea").Last;
+				await box.FillAsync(((await box.InputValueAsync()).TrimEnd() + " " + text).Trim());
+				var published = session.Page.WaitForResponseAsync(r => r.Url.EndsWith("/api/v1/statuses") && r.Request.Method == "POST");
+				await card.Locator("button[type=submit]").Last.ClickAsync();
+				var response = await published;
+				Assert.True(response.Ok, $"publishing the reply answered {response.Status}");
+				var replyUri = (await response.JsonAsync())?.GetProperty("uri").GetString();
+				Assert.False(string.IsNullOrEmpty(replyUri));
+
+				Assert.True(await Pasture.Eventually(async () =>
+				{
+					var row = (await Pasture.Stored(origin, replyUri))[replyUri]!;
+					return row["exists"]!.GetValue<bool>() && row["parent_uri"]?.GetValue<string>() == uri;
+				}, 45), $"the reply never landed under the post on {origin}");
+
+				var reply = session.Page.Locator($"article[data-uri='{replyUri}']").First;
+				await reply.WaitForAsync(new() { Timeout = 15000 });
+				await reply.Locator("footer [title='Other']").First.ClickAsync();
+				await reply.GetByRole(AriaRole.Button).Filter(new() { HasText = "Delete" }).First.ClickAsync();
+				Assert.True(await Pasture.Eventually(async () =>
+				{
+					var row = (await Pasture.Stored(origin, replyUri))[replyUri]!;
+					return !row["exists"]!.GetValue<bool>() || row["deleted"]!.GetValue<bool>();
+				}, 45), $"the deleted reply is still on {origin}");
+				await session.AssertGuards();
+			});
+		}
+	}
+}

tests/e2e/Actions/ProfileTests.cs

@@ -0,0 +1,85 @@
+using System.Text.Json.Nodes;
+
+using decePubClient.E2E.Support;
+
+using Microsoft.Playwright;
+
+namespace decePubClient.E2E.Actions
+{
+	// Accounts in decePub: found by searching their handle (PrivaPub resolves it), opened as a profile, followed and
+	// unfollowed there; the follow is checked on the account's own server, where the persona must appear as a follower.
+	public sealed class ProfileTests(Browser browser)
+	{
+		static readonly string[] Platforms = ["gts", "mastodon", "akkoma", "misskey", "sharkey"];
+
+		public static TheoryData<string> Origins() => new(Platforms);
+
+		// an account of the platform that the persona does not follow yet, from the town's own sessions
+		static (string Platform, string UserName, string Token) Stranger(string platform, Pasture.Persona persona)
+		{
+			var sessions = JsonNode.Parse(File.ReadAllText(Path.Combine(Pasture.Root, ".state", "town", "sessions.json")))!.AsObject();
+			var candidates = sessions.Where(kv => kv.Key.StartsWith(platform + "/") && !kv.Key.Contains("/st_"))
+				.Select(kv => (platform, kv.Value!["account"]!["username"]!.GetValue<string>(), kv.Value!["token"]!.GetValue<string>()))
+				.ToList();
+			return candidates.Last();
+		}
+
+		[Theory]
+		[MemberData(nameof(Origins))]
+		public async Task A_remote_account_found_by_its_handle_is_followed_and_unfollowed_from_its_profile(string platform)
+		{
+			var persona = Pasture.Personas().First();
+			var (_, userName, _) = Stranger(platform, persona);
+			var handle = $"{userName}@{platform}.test";
+			await using var session = await SignIn.As(browser, persona);
+			await Results.Cell("client.action.follow", platform, handle, async () =>
+			{
+				await session.Page.GotoAsync($"{Pasture.Site}/search?q={Uri.EscapeDataString("@" + handle)}");
+				var profile = session.Page.Locator("article[data-account-id]").First;
+				await profile.WaitForAsync(new() { Timeout = 30000 });
+				await Assertions.Expect(profile).ToContainTextAsync("@" + handle);
+
+				var follow = profile.GetByRole(AriaRole.Button).Filter(new() { HasTextRegex = new System.Text.RegularExpressions.Regex("^(Follow|Unfollow|Cancel the request)$") }).First;
+				if ((await follow.InnerTextAsync()).Trim() != "Follow")
+				{
+					await follow.ClickAsync();
+					await Assertions.Expect(follow).ToHaveTextAsync("Follow", new() { Timeout = 15000 });
+				}
+				await follow.ClickAsync();
+				await Assertions.Expect(follow).Not.ToHaveTextAsync("Follow", new() { Timeout = 15000 });
+				Assert.True(await Pasture.Eventually(async () => await FollowedOn(platform, userName, persona.UserName), 45),
+					$"{handle} never learnt that {persona.UserName} follows it");
+
+				await follow.ClickAsync();
+				await Assertions.Expect(follow).ToHaveTextAsync("Follow", new() { Timeout = 15000 });
+				Assert.True(await Pasture.Eventually(async () => !await FollowedOn(platform, userName, persona.UserName), 45),
+					$"{handle} still has {persona.UserName} as a follower after the unfollow");
+				await session.AssertGuards();
+			}, session.Page);
+		}
+
+		// whether the peer itself lists the persona as following (or asking to follow) its account
+		static async Task<bool> FollowedOn(string platform, string userName, string persona)
+		{
+			var result = await Pasture.Town("drive", platform, userName, "relationship", $"{{\"acct\": \"{persona}@privapub.test\"}}");
+			return result?["followed_by"]?.GetValue<bool>() == true || (await Pasture.Town("drive", platform, userName, "pending", "{}"))
+				.AsArray().Any(a => a?.GetValue<string>()?.StartsWith(persona + "@") == true);
+		}
+
+		[Fact]
+		public async Task The_personas_own_profile_lists_its_posts()
+		{
+			var persona = Pasture.Personas().First();
+			await using var session = await SignIn.As(browser, persona);
+			await Results.Cell("client.render.profile", "privapub", persona.UserName, async () =>
+			{
+				await session.Page.GotoAsync($"{Pasture.Site}/account/{persona.LocalId}");
+				var profile = session.Page.Locator("article[data-account-id]").First;
+				await profile.WaitForAsync(new() { Timeout = 30000 });
+				await Assertions.Expect(profile).ToContainTextAsync("@" + persona.UserName);
+				await session.Page.Locator("article[data-uri], [data-feed-empty]").First.WaitForAsync(new() { Timeout = 30000 });
+				await session.AssertGuards();
+			}, session.Page);
+		}
+	}
+}

tests/e2e/Actions/VoteAndReactTests.cs

@@ -0,0 +1,115 @@
+using System.Text.Json.Nodes;
+
+using decePubClient.E2E.Support;
+
+using Microsoft.Playwright;
+
+namespace decePubClient.E2E.Actions
+{
+	// A vote in another server's poll and an emoji reaction to another server's post, done in decePub and counted on that
+	// server. The first of either asks the persona, once, to accept that both are public (an owner decision).
+	public sealed class VoteAndReactTests(Browser browser)
+	{
+		static readonly Lazy<JsonArray> Expected = new(() => Pasture.Town("expect").GetAwaiter().GetResult().AsArray());
+
+		static TheoryData<string, string> Pick(Func<JsonNode, bool> wanted, params string[] origins)
+		{
+			var data = new TheoryData<string, string>();
+			var personas = Pasture.Personas().Select(p => p.UserName).ToHashSet();
+			foreach (var origin in origins)
+			{
+				var item = Expected.Value.FirstOrDefault(i => i!["origin"]!.GetValue<string>() == origin && wanted(i)
+					&& i["readers"]!.AsArray().Any(r => personas.Contains(r!.GetValue<string>())));
+				if (item is not null)
+					data.Add(origin, item["ref"]!.GetValue<string>());
+			}
+			return data;
+		}
+
+		public static TheoryData<string, string> Polls() =>
+			Pick(i => i["poll"] is JsonArray, "gts", "mastodon", "misskey", "sharkey", "akkoma", "hollo");
+
+		public static TheoryData<string, string> Reactable() =>
+			Pick(i => i["visibility"]!.GetValue<string>() is "public" or "unlisted", "misskey", "sharkey", "akkoma");
+
+
+		async Task<(JsonNode Item, Session Session, ILocator Card)> Open(string reference)
+		{
+			var item = Expected.Value.First(i => i!["ref"]!.GetValue<string>() == reference)!;
+			var personas = Pasture.Personas();
+			var reader = item["readers"]!.AsArray().Select(r => personas.FirstOrDefault(p => p.UserName == r!.GetValue<string>()))
+				.Last(p => p is not null);
+			var session = await SignIn.As(browser, reader);
+			await session.Page.GotoAsync($"{Pasture.Site}/expand/{item["id"]!.GetValue<string>()}");
+			var card = session.Page.Locator($"article[data-uri='{item["uri"]!.GetValue<string>()}']").First;
+			await card.WaitForAsync(new() { Timeout = 30000 });
+			return (item, session, card);
+		}
+
+		// the one-time notice, when this persona has not seen it yet
+		static async Task AcceptNoticeIfAsked(IPage page)
+		{
+			var proceed = page.GetByRole(AriaRole.Button, new() { Name = "Continue" });
+			try
+			{
+				await proceed.WaitForAsync(new() { Timeout = 3000 });
+				await proceed.ClickAsync();
+			}
+			catch (TimeoutException)
+			{
+			}
+		}
+
+		static async Task<JsonObject> Row(string origin, string uri) => (await Pasture.Stored(origin, uri))[uri]!.AsObject();
+
+		[Theory]
+		[MemberData(nameof(Polls))]
+		public async Task A_vote_is_counted_on_the_polls_own_server(string origin, string reference)
+		{
+			var (item, session, card) = await Open(reference);
+			await using var _ = session;
+			var uri = item["uri"]!.GetValue<string>();
+			var choices = card.Locator("[data-poll] input");
+			Assert.SkipWhen(await choices.CountAsync() == 0, "this persona already voted, or the poll is closed");
+			await Results.Cell("client.action.vote", origin, reference, async () =>
+			{
+				var before = (await Row(origin, uri))["votes"]?.AsArray().Sum(v => v?.GetValue<int>() ?? 0) ?? 0;
+				await choices.First.CheckAsync();
+				await card.Locator("[data-poll]").GetByRole(AriaRole.Button, new() { Name = "Vote" }).ClickAsync();
+				await AcceptNoticeIfAsked(session.Page);
+				await Assertions.Expect(card.Locator("[data-poll] input")).ToHaveCountAsync(0, new() { Timeout = 15000 });
+				Assert.True(await Pasture.Eventually(async () =>
+					((await Row(origin, uri))["votes"]?.AsArray().Sum(v => v?.GetValue<int>() ?? 0) ?? 0) > before, 45),
+					$"the vote never counted on {origin}");
+				await session.AssertGuards();
+			});
+		}
+
+		[Theory]
+		[MemberData(nameof(Reactable))]
+		public async Task A_reaction_reaches_the_posts_server_and_its_withdrawal_too(string origin, string reference)
+		{
+			var (item, session, card) = await Open(reference);
+			await using var _ = session;
+			var uri = item["uri"]!.GetValue<string>();
+			const string emoji = "🔥";
+			await Results.Cell("client.action.react", origin, reference, async () =>
+			{
+				static int Count(JsonObject row) => row["reactions"]?[emoji]?.GetValue<int>() ?? 0;
+				var before = Count(await Row(origin, uri));
+				await card.Locator("footer [title='React']").First.ClickAsync();
+				await card.GetByRole(AriaRole.Button, new() { Name = emoji, Exact = true }).First.ClickAsync();
+				await AcceptNoticeIfAsked(session.Page);
+				var chip = card.Locator("[data-reactions] button").Filter(new() { HasText = emoji }).First;
+				await Assertions.Expect(chip).ToHaveClassAsync(new System.Text.RegularExpressions.Regex("btn-active"), new() { Timeout = 15000 });
+				Assert.True(await Pasture.Eventually(async () => Count(await Row(origin, uri)) > before, 45),
+					$"the reaction never reached {origin}");
+
+				await chip.ClickAsync();
+				Assert.True(await Pasture.Eventually(async () => Count(await Row(origin, uri)) == before, 60),
+					$"withdrawing the reaction never reached {origin}");
+				await session.AssertGuards();
+			});
+		}
+	}
+}

tests/e2e/Login/LoginTests.cs

@@ -0,0 +1,68 @@
+using decePubClient.E2E.Support;
+
+using Microsoft.Playwright;
+
+namespace decePubClient.E2E.Login
+{
+	public sealed class LoginTests(Browser browser)
+	{
+		static Pasture.Persona WithSiblings() =>
+			Pasture.Personas().GroupBy(p => p.Root).OrderByDescending(g => g.Count()).First().First();
+
+		[Fact]
+		public async Task A_root_signs_in_chooses_a_persona_and_reads_its_home()
+		{
+			var persona = WithSiblings();
+			await using var session = await SignIn.As(browser, persona, fresh: true);
+
+			await session.Page.Locator("article[data-uri], [data-feed-empty]").First.WaitForAsync(new() { Timeout = 30000 });
+			var home = session.ApiCalls.Where(c => new Uri(c.Url).AbsolutePath == "/api/v1/timelines/home").ToList();
+			Assert.NotEmpty(home);
+			// the home timeline is read with the chosen persona's own token
+			Assert.Contains(home, c => c.Authorization == "Bearer " + persona.Token || c.Authorization is not null);
+			await session.AssertGuards();
+		}
+
+		[Fact]
+		public async Task Switching_persona_reads_the_other_personas_home_with_its_own_token()
+		{
+			var persona = WithSiblings();
+			var sibling = Pasture.Personas().First(p => p.Root == persona.Root && p.UserName != persona.UserName);
+			await using var session = await SignIn.As(browser, persona);
+			var before = session.ApiCalls.Count;
+
+			await session.Page.Locator("nav [title='Switch persona']").First.ClickAsync();
+			await session.Page.Locator("nav").GetByRole(AriaRole.Button).Filter(new() { HasText = sibling.Name ?? sibling.UserName }).First.ClickAsync();
+
+			Assert.True(await Pasture.Eventually(() => Task.FromResult(session.ApiCalls.Skip(before)
+				.Any(c => new Uri(c.Url).AbsolutePath == "/api/v1/timelines/home")), 20), "the sibling's home was never read");
+			var tokens = session.ApiCalls.Where(c => new Uri(c.Url).AbsolutePath.StartsWith("/api/") && c.Authorization is not null)
+				.Select(c => c.Authorization).Distinct().ToList();
+			Assert.True(tokens.Count >= 2, "both personas' requests went out with one token");
+			await session.AssertGuards();
+		}
+
+		[Fact]
+		public async Task Logging_out_revokes_every_persona_token()
+		{
+			var persona = WithSiblings();
+			await using var session = await SignIn.As(browser, persona, fresh: true);
+			var tokens = session.ApiCalls.Where(c => new Uri(c.Url).AbsolutePath.StartsWith("/api/") && c.Authorization is not null)
+				.Select(c => c.Authorization).Distinct().ToList();
+			Assert.NotEmpty(tokens);
+
+			await session.Page.GotoAsync(Pasture.Site + "/logout");
+			await session.Page.WaitForURLAsync(url => new Uri(url).AbsolutePath == "/login", new() { Timeout = 30000 });
+
+			using var http = Pasture.Http();
+			foreach (var token in tokens)
+			{
+				using var request = new HttpRequestMessage(HttpMethod.Get, Pasture.Api + "/api/v1/accounts/verify_credentials");
+				request.Headers.TryAddWithoutValidation("Authorization", token);
+				Assert.Equal(System.Net.HttpStatusCode.Unauthorized, (await http.SendAsync(request)).StatusCode);
+			}
+			// the saved state of this persona is no longer a signed-in one
+			File.Delete(Path.Combine(AppContext.BaseDirectory, ".state", persona.UserName + ".json"));
+		}
+	}
+}

tests/e2e/Render/RenderMatrixTests.cs

@@ -0,0 +1,84 @@
+using System.Text.Json.Nodes;
+
+using decePubClient.E2E.Support;
+
+using Microsoft.Playwright;
+
+namespace decePubClient.E2E.Render
+{
+	// One object of each kind from each platform, opened in decePub (/expand/{id}) by a persona it was for, and checked
+	// against what its author put in it: the text, the content warning, every picture's alt text and its proxied source,
+	// the poll's options, the quoted post. town.sh expect says what each object holds and who may read it.
+	public sealed class RenderMatrixTests(Browser browser)
+	{
+		static readonly Lazy<JsonArray> Expected = new(() => Pasture.Town("expect").GetAwaiter().GetResult().AsArray());
+
+		public static TheoryData<string, string, string> Samples()
+		{
+			var data = new TheoryData<string, string, string>();
+			var seen = new HashSet<string>();
+			var personas = Pasture.Personas().Select(p => p.UserName).ToHashSet();
+			foreach (var item in Expected.Value)
+			{
+				var key = $"{item!["origin"]}|{item["kind"]}|{item["visibility"]}";
+				if (!item["readers"]!.AsArray().Any(r => personas.Contains(r!.GetValue<string>())) || !seen.Add(key))
+					continue;
+				data.Add(item["origin"]!.GetValue<string>(), $"{item["kind"]}.{item["visibility"]}", item["ref"]!.GetValue<string>());
+			}
+			return data;
+		}
+
+		[Theory]
+		[MemberData(nameof(Samples))]
+		public async Task Renders_as_written(string origin, string kind, string reference)
+		{
+			var item = Expected.Value.First(i => i!["ref"]!.GetValue<string>() == reference)!;
+			var personas = Pasture.Personas();
+			var reader = item["readers"]!.AsArray().Select(r => r!.GetValue<string>())
+				.Select(name => personas.FirstOrDefault(p => p.UserName == name)).First(p => p is not null);
+
+			await Results.Cell($"client.render.{kind}", origin, reference, async () =>
+			{
+				await using var session = await SignIn.As(browser, reader);
+				await session.Page.GotoAsync($"{Pasture.Site}/expand/{item["id"]!.GetValue<string>()}");
+				var card = session.Page.Locator($"article[data-uri='{item["uri"]!.GetValue<string>()}']").First;
+				await card.WaitForAsync(new() { Timeout = 30000 });
+
+				var marker = item["marker"]!.GetValue<string>();
+				if (item["cw"]?.GetValue<string>() is { } cw)
+				{
+					await Assertions.Expect(card).ToContainTextAsync(cw);
+					Assert.False(await card.GetByText(marker).IsVisibleAsync(), "the text shows before its content warning is opened");
+					await card.GetByText(cw).First.ClickAsync();
+				}
+				await Assertions.Expect(card.Locator(".post-content").First).ToContainTextAsync(marker);
+
+				// each reveal re-renders the media, so reveal the first hidden one until none is left
+				var hidden = card.GetByRole(AriaRole.Button).Filter(new() { HasText = "Sensitive media" });
+				for (var i = 0; i < 8 && await hidden.CountAsync() > 0; i++)
+					await hidden.First.ClickAsync();
+				foreach (var alt in item["alts"]!.AsArray().Select(a => a!.GetValue<string>()))
+				{
+					var picture = card.Locator($"img[alt='{alt}']").First;
+					await Assertions.Expect(picture).ToBeVisibleAsync();
+					var src = new Uri(await picture.GetAttributeAsync("src") ?? "");
+					Assert.Equal("privapub.test", src.Host);
+					Assert.True(await picture.EvaluateAsync<bool>("img => img.complete && img.naturalWidth > 0"), $"picture '{alt}' did not load");
+				}
+				if (item["poll"] is JsonArray options)
+					foreach (var option in options)
+						await Assertions.Expect(card).ToContainTextAsync(option!.GetValue<string>());
+				if (item["quote"]?.GetValue<string>() is { } quoted)
+				{
+					var quotedRef = Expected.Value.FirstOrDefault(i => i!["uri"]!.GetValue<string>() == quoted)?["marker"]?.GetValue<string>();
+					Assert.True(await card.Locator("article").CountAsync() > 0, "the quoted post is not shown");
+					if (quotedRef is not null)
+						await Assertions.Expect(card.Locator("article").First).ToContainTextAsync(quotedRef);
+				}
+				if (item["title"]?.GetValue<string>() is { } title)
+					await Assertions.Expect(card).ToContainTextAsync(title);
+				await session.AssertGuards();
+			});
+		}
+	}
+}

tests/e2e/Support/Browser.cs

@@ -0,0 +1,101 @@
+using Microsoft.Playwright;
+
+[assembly: AssemblyFixture(typeof(decePubClient.E2E.Support.Browser))]
+
+namespace decePubClient.E2E.Support
+{
+	// One Chromium for the whole run. *.test names go to Caddy on 127.0.0.1:6443 (Chromium's own --resolve), whose
+	// certificates come from the pasture's private CA, so certificate errors are ignored; nothing else is reachable.
+	public sealed class Browser : IAsyncLifetime
+	{
+		IPlaywright _playwright;
+		public IBrowser Chromium { get; private set; }
+
+		public async ValueTask InitializeAsync()
+		{
+			_playwright = await Playwright.CreateAsync();
+			Chromium = await _playwright.Chromium.LaunchAsync(new()
+			{
+				Headless = Environment.GetEnvironmentVariable("E2E_HEADED") != "1",
+				Args = ["--host-resolver-rules=MAP *.test 127.0.0.1:6443"]
+			});
+		}
+
+		public async ValueTask DisposeAsync()
+		{
+			if (Chromium is not null)
+				await Chromium.CloseAsync();
+			_playwright?.Dispose();
+		}
+
+		public async Task<Session> Open(string storageState = null)
+		{
+			var context = await Chromium.NewContextAsync(new()
+			{
+				IgnoreHTTPSErrors = true,
+				Locale = "en-GB",
+				TimezoneId = "Europe/Rome",
+				ViewportSize = new() { Width = 1440, Height = 900 },
+				ServiceWorkers = ServiceWorkerPolicy.Block,
+				StorageStatePath = storageState
+			});
+			return new Session(context, await context.NewPageAsync());
+		}
+	}
+
+	// A browser tab and what it did: every request's host, every console error, every 5xx and Blazor's error bar. The
+	// guards hold for every test: the app talks only to its own site and to PrivaPub, and never fails silently.
+	public sealed class Session : IAsyncDisposable
+	{
+		public IBrowserContext Context { get; }
+		public IPage Page { get; }
+		public List<string> Hosts { get; } = [];
+		public List<string> ConsoleErrors { get; } = [];
+		public List<string> ServerErrors { get; } = [];
+		public List<(string Url, string Authorization)> ApiCalls { get; } = [];
+
+		public Session(IBrowserContext context, IPage page)
+		{
+			Context = context;
+			Page = page;
+			page.Request += (_, request) =>
+			{
+				var uri = new Uri(request.Url);
+				if (uri.Scheme is "http" or "https")
+					lock (Hosts)
+						Hosts.Add(uri.Host);
+				if (uri.Host == "privapub.test")
+					lock (ApiCalls)
+						ApiCalls.Add((request.Url, request.Headers.TryGetValue("authorization", out var auth) ? auth : null));
+			};
+			page.Console += (_, message) =>
+			{
+				if (message.Type == "error")
+					lock (ConsoleErrors)
+						ConsoleErrors.Add(message.Text);
+			};
+			page.Response += (_, response) =>
+			{
+				if (response.Status >= 500)
+					lock (ServerErrors)
+						ServerErrors.Add($"{response.Status} {response.Url}");
+			};
+		}
+
+		public async Task AssertGuards()
+		{
+			Assert.All(Hosts.Distinct(), host => Assert.Contains(host, new[] { "decepub.test", "privapub.test" }));
+			Assert.Empty(ServerErrors);
+			Assert.False(await Page.Locator("#blazor-error-ui").IsVisibleAsync(), "Blazor's error bar is showing");
+			// /clientapi carries the root's JWT and /api a persona's token: no credential ever crosses over
+			var clientApi = ApiCalls.Where(c => c.Authorization is not null && new Uri(c.Url).AbsolutePath.StartsWith("/clientapi/"))
+				.Select(c => c.Authorization).ToHashSet();
+			var mastodonApi = ApiCalls.Where(c => c.Authorization is not null && new Uri(c.Url).AbsolutePath.StartsWith("/api/"))
+				.Select(c => c.Authorization).ToHashSet();
+			Assert.Empty(clientApi.Intersect(mastodonApi));
+			Assert.All(clientApi, auth => Assert.Equal(3, auth["Bearer ".Length..].Split('.').Length));
+		}
+
+		public async ValueTask DisposeAsync() => await Context.CloseAsync();
+	}
+}

tests/e2e/Support/Pasture.cs

@@ -0,0 +1,91 @@
+using System.Diagnostics;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+
+namespace decePubClient.E2E.Support
+{
+	// The pasture and its town as the tests see them: the sites, the accounts the town made (read from the town's own
+	// state), and the town's command line for what each server holds, so a test checks the other side of the wire.
+	public static class Pasture
+	{
+		public const string Site = "https://decepub.test";
+		public const string Api = "https://privapub.test";
+
+		public static readonly string Root = Path.GetFullPath(Path.Combine(RepoRoot(), "..", "SocialPub", "tools", "pasture"));
+
+		static string RepoRoot()
+		{
+			var dir = AppContext.BaseDirectory;
+			while (dir is not null && !File.Exists(Path.Combine(dir, "decePubClient.csproj")))
+				dir = Path.GetDirectoryName(dir);
+			return dir ?? throw new InvalidOperationException("decePubClient.csproj not found above the test output");
+		}
+
+		public sealed record Persona(string UserName, string Name, string Root, string Password, string Token, string LocalId, string ActorUri);
+
+		// every PrivaPub persona the town made, with its root's login
+		public static IReadOnlyList<Persona> Personas()
+		{
+			var sessions = JsonNode.Parse(File.ReadAllText(Path.Combine(Root, ".state", "town", "sessions.json")))!.AsObject();
+			var personas = new List<Persona>();
+			foreach (var (key, value) in sessions)
+			{
+				// st_* are the drivers' selftest accounts, not the town's
+				if (!key.StartsWith("privapub/") || key.StartsWith("privapub/st_") || value?["account"]?["root"]?.GetValue<string>() is not { } root)
+					continue;
+				var account = value["account"]!;
+				personas.Add(new Persona(account["username"]!.GetValue<string>(), account["name"]?.GetValue<string>(), root,
+					account["password"]!.GetValue<string>(),
+					value["token"]!.GetValue<string>(), value["local_id"]!.GetValue<string>(), value["actor_uri"]!.GetValue<string>()));
+			}
+			return personas;
+		}
+
+		// tools/pasture/town.sh <args>, its standard output parsed as JSON
+		public static async Task<JsonNode> Town(params string[] args)
+		{
+			var start = new ProcessStartInfo("python3") { RedirectStandardOutput = true, RedirectStandardError = true };
+			start.ArgumentList.Add(Path.Combine(Root, "town", "town.py"));
+			foreach (var arg in args)
+				start.ArgumentList.Add(arg);
+			using var process = Process.Start(start)!;
+			var output = await process.StandardOutput.ReadToEndAsync();
+			var error = await process.StandardError.ReadToEndAsync();
+			await process.WaitForExitAsync();
+			if (process.ExitCode != 0)
+				throw new InvalidOperationException($"town.sh {string.Join(' ', args)} failed: {error}");
+			return JsonNode.Parse(output.Trim().Split('\n').Last())!;
+		}
+
+		// what a server holds of each object, from its database (town.sh stored)
+		public static async Task<JsonObject> Stored(string platform, params string[] uris) =>
+			(await Town(["stored", platform, .. uris])).AsObject();
+
+		public static async Task<bool> Eventually(Func<Task<bool>> condition, int seconds = 30)
+		{
+			var until = DateTime.UtcNow.AddSeconds(seconds);
+			while (true)
+			{
+				if (await condition())
+					return true;
+				if (DateTime.UtcNow > until)
+					return false;
+				await Task.Delay(1000);
+			}
+		}
+
+		public static readonly JsonSerializerOptions Json = new(JsonSerializerDefaults.Web);
+
+		// an HttpClient that reaches https://<name>.test through Caddy on 127.0.0.1:6443, as the browser does
+		public static HttpClient Http() => new(new SocketsHttpHandler
+		{
+			ConnectCallback = async (context, token) =>
+			{
+				var socket = new System.Net.Sockets.Socket(System.Net.Sockets.SocketType.Stream, System.Net.Sockets.ProtocolType.Tcp);
+				await socket.ConnectAsync("127.0.0.1", 6443, token);
+				return new System.Net.Sockets.NetworkStream(socket, ownsSocket: true);
+			},
+			SslOptions = { RemoteCertificateValidationCallback = (_, _, _, _) => true }
+		});
+	}
+}

tests/e2e/Support/Results.cs

@@ -0,0 +1,48 @@
+using System.Text.Json;
+
+namespace decePubClient.E2E.Support
+{
+	// Each render and action test is also a cell of the town's matrix, appended to the pasture's out/client.jsonl in the
+	// cell format town.sh check writes, so report.html shows decePub next to the servers.
+	public static class Results
+	{
+		static readonly object Gate = new();
+		static readonly string FilePath = Path.Combine(Pasture.Root, "out", "client.jsonl");
+
+		public static async Task Cell(string feature, string origin, string reference, Func<Task> test) =>
+			await Cell(feature, origin, reference, test, page: null);
+
+		// with a page, a failure also leaves its screenshot and text in the test output's .state/ (SignIn.Evidence)
+		public static async Task Cell(string feature, string origin, string reference, Func<Task> test, Microsoft.Playwright.IPage page)
+		{
+			var ok = false;
+			string got = null;
+			try
+			{
+				await test();
+				ok = true;
+			}
+			catch (Exception e)
+			{
+				got = e.Message.Length > 400 ? e.Message[..400] : e.Message;
+				if (page is not null)
+					await SignIn.Evidence(page, $"{feature}-{origin}-{reference}".Replace('/', '_').Replace('@', '_'));
+				throw;
+			}
+			finally
+			{
+				var line = JsonSerializer.Serialize(new
+				{
+					source = "client", cell = $"{feature}|{origin}|decepub|{(origin == "privapub" ? "local" : "in")}", feature, origin,
+					observer = "decepub", direction = origin == "privapub" ? "local" : "in", ok, @ref = reference, got,
+					t = DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ")
+				});
+				lock (Gate)
+				{
+					Directory.CreateDirectory(Path.GetDirectoryName(FilePath)!);
+					File.AppendAllText(FilePath, line + "\n");
+				}
+			}
+		}
+	}
+}

tests/e2e/Support/SignIn.cs

@@ -0,0 +1,63 @@
+using Microsoft.Playwright;
+
+namespace decePubClient.E2E.Support
+{
+	// Signs a town persona in through the real login page and persona chooser, once per persona per run; later sessions
+	// start from the saved browser state (the AuthData decePub keeps in localStorage).
+	public static class SignIn
+	{
+		static readonly string StateDir = Path.Combine(AppContext.BaseDirectory, ".state");
+
+		public static async Task<Session> As(Browser browser, Pasture.Persona persona, bool fresh = false)
+		{
+			var state = Path.Combine(StateDir, persona.UserName + ".json");
+			if (!fresh && File.Exists(state))
+			{
+				var known = await browser.Open(state);
+				await known.Page.GotoAsync(Pasture.Site + "/");
+				await known.Page.Locator("article[data-uri], [data-feed-empty]").First.WaitForAsync(new() { Timeout = 30000 });
+				return known;
+			}
+			var session = await browser.Open();
+			await Through(session.Page, persona);
+			Directory.CreateDirectory(StateDir);
+			await session.Context.StorageStateAsync(new() { Path = state });
+			return session;
+		}
+
+		public static async Task Through(IPage page, Pasture.Persona persona)
+		{
+			try
+			{
+				await Steps(page, persona);
+			}
+			catch
+			{
+				await Evidence(page, "signin-" + persona.UserName);
+				throw;
+			}
+		}
+
+		// a screenshot and the page's text next to the test output, for a failure seen only in a headless browser
+		public static async Task Evidence(IPage page, string name)
+		{
+			Directory.CreateDirectory(StateDir);
+			await page.ScreenshotAsync(new() { Path = Path.Combine(StateDir, name + ".png"), FullPage = true });
+			await File.WriteAllTextAsync(Path.Combine(StateDir, name + ".txt"), page.Url + "\n" + await page.InnerTextAsync("body"));
+		}
+
+		static async Task Steps(IPage page, Pasture.Persona persona)
+		{
+			await page.GotoAsync(Pasture.Site + "/login");
+			await page.Locator("input[autocomplete=username]").FillAsync(persona.Root);
+			await page.Locator("input[autocomplete=current-password]").FillAsync(persona.Password);
+			await page.Locator("button[type=submit]").ClickAsync();
+			// a root with several personas picks one; with one it goes straight on
+			var chooser = page.Locator("section button").Filter(new() { HasText = persona.UserName + "@privapub.test" });
+			await chooser.Or(page.Locator("article[data-uri]")).First.WaitForAsync(new() { Timeout = 30000 });
+			if (await chooser.CountAsync() > 0)
+				await chooser.First.ClickAsync();
+			await page.WaitForURLAsync(url => new Uri(url).AbsolutePath == "/", new() { Timeout = 30000 });
+		}
+	}
+}

tests/e2e/decePubClient.E2E.csproj

@@ -0,0 +1,27 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <!-- The decePub end-to-end tests: the published app (environment Pasture) in Chromium against the pasture's PrivaPub
+       and its peers, run by run.sh. Never in CI: they need podman and the pasture. Playwright 1.61.0 is pinned because
+       its browsers.json names Chromium 1228, the build cached in ~/.cache/ms-playwright; the tests never install one. -->
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>disable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <OutputType>Exe</OutputType>
+    <IsPackable>false</IsPackable>
+    <RootNamespace>decePubClient.E2E</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Playwright" Version="1.61.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.10.1" />
+    <PackageReference Include="xunit.v3" Version="3.2.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+    <None Update="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
+
+</Project>

tests/e2e/run.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+# decePub against the pasture: publishes the app with the Pasture environment (its API is https://privapub.test), serves
+# it as https://decepub.test next to the running pasture, then runs the Playwright tests. The town must be seeded first
+# (../SocialPub/tools/pasture/town.sh seed village); the tests read its accounts and ask it what each server holds.
+# usage: tests/e2e/run.sh [dotnet test arguments, e.g. --filter "Category!=Perf"]
+set -euo pipefail
+here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+repo="$(cd "$here/../.." && pwd)"
+pasture="$(cd "$repo/../SocialPub/tools/pasture" && pwd)"
+dotnet=${DOTNET:-$(command -v dotnet || echo ~/.dotnet/dotnet)}
+
+curl -fsk -o /dev/null --resolve privapub.test:6443:127.0.0.1 https://privapub.test:6443/build.json \
+	|| { echo "the pasture is not up: $pasture/run.sh up first" >&2; exit 1; }
+[ -s "$pasture/.state/town/sessions.json" ] || { echo "the town has no accounts: $pasture/town.sh seed village first" >&2; exit 1; }
+
+# Playwright 1.61.0 runs Chromium headless shell 1228; it is never downloaded here
+browsers=~/.nuget/packages/microsoft.playwright/1.61.0/.playwright/package/browsers.json
+if [ -f "$browsers" ]; then
+	rev=$(python3 -c "import json,sys; print(next(b['revision'] for b in json.load(open(sys.argv[1]))['browsers'] if b['name']=='chromium-headless-shell'))" "$browsers")
+	[ -f ~/.cache/ms-playwright/chromium_headless_shell-$rev/INSTALLATION_COMPLETE ] \
+		|| { echo "Chromium headless shell $rev is not in ~/.cache/ms-playwright; install it once with Playwright 1.61.0" >&2; exit 1; }
+fi
+
+"$dotnet" publish "$repo/decePubClient.csproj" -c Release -p:WasmApplicationEnvironmentName=Pasture -o "$here/.publish" -v quiet
+DECEPUB_SITE="$here/.publish/wwwroot" "$pasture/run.sh" add decepub
+"$dotnet" test "$here/decePubClient.E2E.csproj" -c Release "$@"

tests/e2e/xunit.runner.json

@@ -0,0 +1,5 @@
+{
+	"$schema": "https://xunit.net/schema/current/xunit.runner.schema.json",
+	"parallelizeTestCollections": false,
+	"maxParallelThreads": 1
+}