Add backend test harness with mock SQLite

GameList.Tests/ResultsTests.cs

@@ -0,0 +1,35 @@
+using System.Net.Http.Json;
+using System.Text.Json;
+using GameList.Tests.Support;
+
+namespace GameList.Tests;
+
+public class ResultsTests
+{
+    [Fact]
+    public async Task Results_available_after_admin_unlocks()
+    {
+        using var factory = new TestWebApplicationFactory();
+        var admin = factory.CreateClientWithCookies();
+        await admin.RegisterAsync("admin", admin: true);
+
+        var player = factory.CreateClientWithCookies();
+        await player.RegisterAsync("player");
+        var suggestionId = await player.CreateSuggestionAsync("ResultGame");
+
+        await player.PostAsJsonAsync("/api/me/phase/next", new { });
+        await player.PostAsJsonAsync("/api/votes", new { SuggestionId = suggestionId, Score = 8 });
+        await player.PostAsJsonAsync("/api/votes/finalize", new { Final = true });
+
+        await admin.PostAsJsonAsync("/api/admin/results", new { resultsOpen = true });
+
+        await player.PostAsJsonAsync("/api/me/phase/next", new { });
+
+        var results = await player.GetFromJsonAsync<JsonElement>("/api/results");
+
+        Assert.True(results.GetArrayLength() >= 1);
+        var first = results[0];
+        Assert.Equal("ResultGame", first.GetProperty("Name").GetString());
+        Assert.Equal(8, (int)first.GetProperty("Average").GetDouble());
+    }
+}