Testprojekt hinzugefügt & umfassende Server-Tests

Neues Testprojekt SlipItIn.Server.Tests erstellt und in die Solution eingebunden. Unit- und Integrationstests für AuthController, DbSeeder, GameHub und GameService implementiert. TestDbHelper für InMemory-DbContexts und Testdaten hinzugefügt. Tests prüfen Erfolgs- und Fehlerfälle inkl. Validierungen, Fehlerbehandlung und DB-Zustände.

SlipItIn.Server.Tests/DbSeederTests.cs

@@ -0,0 +1,61 @@
+using SlipItIn.Server.Data;
+
+namespace SlipItIn.Server.Tests;
+
+public class DbSeederTests
+{
+    [Fact]
+    public async Task SeedAsync_SeedsUsersAndPhrases_WhenDatabaseIsEmpty()
+    {
+        var factory = TestDbHelper.CreateFactory();
+        using var db = factory.CreateDbContext();
+
+        await DbSeeder.SeedAsync(db);
+
+        Assert.Equal(2, db.Users.Count());
+        Assert.True(db.Phrases.Count() >= 5);
+        Assert.All(db.Phrases, p => Assert.True(p.IsActive));
+    }
+
+    [Fact]
+    public async Task SeedAsync_DoesNothing_WhenUsersAlreadyExist()
+    {
+        var factory = TestDbHelper.CreateFactory();
+        using var db = factory.CreateDbContext();
+        TestDbHelper.SeedUser(db);
+
+        await DbSeeder.SeedAsync(db);
+
+        Assert.Equal(1, db.Users.Count());
+        Assert.Empty(db.Phrases);
+    }
+
+    [Fact]
+    public async Task SeedAsync_DoesNothing_WhenPhrasesAlreadyExist()
+    {
+        var factory = TestDbHelper.CreateFactory();
+        using var db = factory.CreateDbContext();
+        TestDbHelper.SeedPhrases(db, 1);
+
+        await DbSeeder.SeedAsync(db);
+
+        Assert.Equal(1, db.Users.Count()); // nur der Creator-User des Phrase-Seedings
+        Assert.Equal(1, db.Phrases.Count());
+    }
+
+    [Fact]
+    public async Task SeedAsync_IsIdempotent_WhenCalledTwice()
+    {
+        var factory = TestDbHelper.CreateFactory();
+        using var db = factory.CreateDbContext();
+
+        await DbSeeder.SeedAsync(db);
+        var userCount = db.Users.Count();
+        var phraseCount = db.Phrases.Count();
+
+        await DbSeeder.SeedAsync(db);
+
+        Assert.Equal(userCount, db.Users.Count());
+        Assert.Equal(phraseCount, db.Phrases.Count());
+    }
+}