Initial

tests/ClaudeMailbox.Tests/MailboxEndToEndTests.cs

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+using System.Net;
+using System.Net.Http.Json;
+using System.Text.Json;
+
+namespace ClaudeMailbox.Tests;
+
+public sealed class MailboxEndToEndTests
+{
+    [Fact]
+    public async Task Health_Returns_Ok()
+    {
+        await using var host = await TestHost.StartAsync();
+
+        var res = await host.Client.GetAsync("/health");
+        res.EnsureSuccessStatusCode();
+
+        var body = await res.Content.ReadFromJsonAsync<JsonElement>();
+        Assert.Equal("ok", body.GetProperty("status").GetString());
+    }
+
+    [Fact]
+    public async Task Send_Without_Header_Is_BadRequest()
+    {
+        await using var host = await TestHost.StartAsync();
+
+        var res = await host.Client.PostAsJsonAsync("/v1/send", new { to = "anyone", body = "hi" });
+        Assert.Equal(HttpStatusCode.BadRequest, res.StatusCode);
+    }
+
+    [Fact]
+    public async Task Two_Mailboxes_Coordinate()
+    {
+        await using var host = await TestHost.StartAsync();
+        using var backend = host.NewClientFor("backend");
+        using var frontend = host.NewClientFor("frontend");
+
+        // backend sends to frontend
+        var send = await backend.PostAsJsonAsync("/v1/send", new { to = "frontend", body = "API shape changed" });
+        send.EnsureSuccessStatusCode();
+
+        // frontend peeks — expects 1
+        var peek1 = await frontend.GetFromJsonAsync<JsonElement>("/v1/peek?name=frontend");
+        Assert.Equal(1, peek1.GetProperty("pending").GetInt32());
+
+        // frontend consumes
+        var check = await frontend.PostAsync("/v1/check-inbox?name=frontend", null);
+        check.EnsureSuccessStatusCode();
+        var messages = await check.Content.ReadFromJsonAsync<JsonElement>();
+        Assert.Equal(1, messages.GetArrayLength());
+        var msg = messages[0];
+        Assert.Equal("backend", msg.GetProperty("from").GetString());
+        Assert.Equal("API shape changed", msg.GetProperty("body").GetString());
+
+        // peek again — expects 0
+        var peek2 = await frontend.GetFromJsonAsync<JsonElement>("/v1/peek?name=frontend");
+        Assert.Equal(0, peek2.GetProperty("pending").GetInt32());
+    }
+
+    [Fact]
+    public async Task Check_Inbox_Rejects_Mismatched_Identity()
+    {
+        await using var host = await TestHost.StartAsync();
+        using var backend = host.NewClientFor("backend");
+        using var frontend = host.NewClientFor("frontend");
+
+        await backend.PostAsJsonAsync("/v1/send", new { to = "frontend", body = "hello" });
+
+        // backend tries to consume frontend's inbox — must be rejected
+        var bad = await backend.PostAsync("/v1/check-inbox?name=frontend", null);
+        Assert.Equal(HttpStatusCode.Forbidden, bad.StatusCode);
+    }
+
+    [Fact]
+    public async Task List_Returns_Known_Mailboxes()
+    {
+        await using var host = await TestHost.StartAsync();
+        using var a = host.NewClientFor("alpha");
+        using var b = host.NewClientFor("beta");
+
+        // Touch both mailboxes by having each peek its own inbox
+        await a.GetAsync("/v1/peek?name=alpha");
+        await b.GetAsync("/v1/peek?name=beta");
+
+        // /v1/list is the only endpoint that works without X-Mailbox
+        var list = await host.Client.GetFromJsonAsync<JsonElement>("/v1/list");
+        var names = new List<string>();
+        foreach (var elem in list.EnumerateArray())
+            names.Add(elem.GetProperty("name").GetString()!);
+
+        Assert.Contains("alpha", names);
+        Assert.Contains("beta", names);
+    }
+}