Events-MVC (example with htmx)

Events-MVC/Tests/Events.Tests.IntegrationTests/RegistrationsPageShould.cs

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+using System.Net;
+using Events.Tests.IntegrationTests.Infrastructure;
+
+namespace Events.Tests.IntegrationTests;
+
+public class RegistrationsPageShould
+{
+    [Fact]
+    public async Task ReturnEventSpecificRegistrationsForSelectedEvent()
+    {
+        await using var factory = new CustomWebApplicationFactory(TestDataSeeder.SeedRegistrationsScenario);
+        using var client = factory.CreateClient();
+
+        var response = await client.GetAsync("/Registrations?eventId=100");
+        var html = await response.Content.ReadAsStringAsync();
+
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+        Assert.Contains("Registrations for: Spring Games", html);
+        Assert.Contains("Ivan Horvat", html);
+        Assert.Contains("Johann Schmidt", html);
+        Assert.Contains("Croatia", html);
+        Assert.Contains("Germany", html);
+    }
+
+    [Fact]
+    public async Task ReturnFilteredPartialForHtmxRequestWithCountryFilter()
+    {
+        await using var factory = new CustomWebApplicationFactory(TestDataSeeder.SeedRegistrationsScenario);
+        using var client = factory.CreateClient();
+        client.DefaultRequestHeaders.Add(Events.MVC.Constants.HtmxHeaders.Request, "true");
+
+        var response = await client.GetAsync("/Registrations?eventId=100&filters=CountryCode==HR");
+        var html = await response.Content.ReadAsStringAsync();
+
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+        Assert.Contains("id=\"registrations-panel\"", html);
+        Assert.Contains("Ivan Horvat", html);
+        Assert.DoesNotContain("Johann Schmidt", html);
+        Assert.DoesNotContain("<html", html, StringComparison.OrdinalIgnoreCase);
+    }
+
+    [Fact]
+    public async Task ReturnOnlyMatchingCountrySuggestionsForPersonLookup()
+    {
+        await using var factory = new CustomWebApplicationFactory(TestDataSeeder.SeedRegistrationsScenario);
+        using var client = factory.CreateClient();
+
+        var response = await client.GetAsync("/Registrations/PersonSuggestions?personLookup=jo&countryFilter=DE");
+        var html = await response.Content.ReadAsStringAsync();
+
+        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+        Assert.Contains("Johann Schmidt", html);
+        Assert.Contains("Johann", html);
+        Assert.DoesNotContain("Ivan Horvat", html);
+        Assert.Contains("data-person-suggestion", html);
+    }
+}