refactor: refactors the MongoDB fixture and improves the configuration

Author: https-richardy

Tests/Integration/Fixtures/MongoDatabaseFixture.cs

@@ -2,37 +2,41 @@ namespace HttpsRichardy.Federation.TestSuite.Integration.Fixtures;
 
 public sealed class MongoDatabaseFixture : IAsyncLifetime
 {
-    public string ConnectionString { get; private set; } = string.Empty;
-    public string DatabaseName { get; private set; } = "federation-integration-tests";
-
-    private readonly IContainer _container;
+    public string ConnectionString { get; private set; } = default!;
+    public string DatabaseName { get; private set; } = AppDomain.CurrentDomain.FriendlyName;
 
     public IMongoDatabase Database { get; private set; } = default!;
     public IMongoClient Client { get; private set; } = default!;
 
-    public MongoDatabaseFixture()
-    {
-        _container = new ContainerBuilder("mongo:latest")
-            .WithCleanUp(true)
-            .WithExposedPort(27017)
-            .WithPortBinding(0, 27017)
-            .WithEnvironment("MONGO_INITDB_ROOT_USERNAME", "admin")
-            .WithEnvironment("MONGO_INITDB_ROOT_PASSWORD", "admin")
-            .Build();
-    }
-
-    public async Task DisposeAsync()
-    {
-        await _container.StopAsync();
-    }
-
+    // build a container with the official mongo image
+    // see more: https://dotnet.testcontainers.org/
+    private readonly IContainer _container = new ContainerBuilder("mongo:latest")
+        .WithCleanUp(true)
+        .WithExposedPort(27017)
+        .WithPortBinding(0, 27017)
+        .WithEnvironment("MONGO_INITDB_ROOT_USERNAME", "admin")
+        .WithEnvironment("MONGO_INITDB_ROOT_PASSWORD", "admin")
+        .Build();
+
+    public async Task DisposeAsync() => await _container.StopAsync();
     public async Task InitializeAsync()
     {
         await _container.StartAsync();
 
         var hostPort = _container.GetMappedPublicPort(27017);
-
-        ConnectionString = $"mongodb://admin:admin@localhost:{hostPort}/{DatabaseName}?authSource=admin";
+        var url = new MongoUrlBuilder
+        {
+            Scheme = ConnectionStringScheme.MongoDB,
+            Server = new MongoServerAddress("localhost", hostPort),
+            Username = "admin",
+            Password = "admin",
+            AuthenticationSource = "admin",
+            DatabaseName = DatabaseName
+        };
+
+        // mongo database connection string format:
+        // https://www.mongodb.com/docs/manual/reference/connection-string/
+        ConnectionString = url.ToString();
 
         Client = new MongoClient(ConnectionString);
         Database = Client.GetDatabase(DatabaseName);
@@ -44,9 +48,9 @@ public async Task CleanDatabaseAsync()
             .ListCollectionNames()
             .ToListAsync();
 
-        foreach (var collectionName in collections)
+        foreach (var collection in collections)
         {
-            await Database.DropCollectionAsync(collectionName);
+            await Database.DropCollectionAsync(collection);
         }
     }
 }