Reorganize tests by API and service concerns

RpgRoller.Tests/Api/SystemApiTests.cs

@@ -0,0 +1,33 @@
+using Microsoft.AspNetCore.Mvc.Testing;
+
+namespace RpgRoller.Tests;
+
+public sealed class SystemApiTests : ApiTestBase
+{
+    public SystemApiTests(WebApplicationFactory<Program> factory)
+        : base(factory)
+    {
+    }
+
+    [Fact]
+    public async Task RulesetAndSseEndpoints_ReturnExpectedResponses()
+    {
+        using var factory = CreateFactory(2, 2, 2);
+        using var client = factory.CreateClient(new WebApplicationFactoryClientOptions { AllowAutoRedirect = false });
+
+        var rulesets = await GetAsync<IReadOnlyList<RulesetDefinition>>(client, "/api/rulesets");
+        Assert.Equal(2, rulesets.Count);
+
+        await RegisterAsync(client, "sse", "Password123", "Sse User");
+        await LoginAsync(client, "sse", "Password123");
+
+        var campaign = await PostAsync<CreateCampaignRequest, CampaignSummary>(
+            client,
+            "/api/campaigns",
+            new CreateCampaignRequest("SSE", "d6"));
+
+        var sseResponse = await client.GetAsync($"/api/events/state?campaignId={campaign.Id}", HttpCompletionOption.ResponseHeadersRead);
+        Assert.Equal(HttpStatusCode.OK, sseResponse.StatusCode);
+        Assert.Equal("text/event-stream", sseResponse.Content.Headers.ContentType?.MediaType);
+    }
+}