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test: add comprehensive unit tests for MongoDB error handling
Add unit tests for PR #99 to verify MongoDB error code handling works correctly across different MongoDB versions. Tests validate: - VerifyCollectionExists handles NamespaceExists (error code 48) - VerifyExpireTTLSetup handles IndexOptionsConflict (error code 85) - Race condition handling when collections are created concurrently - TTL index creation, updates, and removal scenarios - Error code validation to ensure MongoDB driver compatibility The tests use the actual MongoDB driver behavior to confirm that CodeName-based exception filtering is more reliable than string matching and works across MongoDB versions 4.x through 7.x. Changes: - Add NSubstitute 5.3.0 for mocking support - Add MongoDbHelperErrorHandlingTests.cs with 12 comprehensive tests - Update GlobalUsings.cs to include NSubstitute All 27 tests pass (15 existing + 12 new).
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‎test/Serilog.Sinks.MongoDB.Tests/GlobalUsings.cs‎

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global using MongoDB.Bson.Serialization.Serializers;
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global using MongoDB.Driver;
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global using NSubstitute;
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global using NUnit.Framework;
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global using Serilog.Events;

‎test/Serilog.Sinks.MongoDB.Tests/MongoDbHelperErrorHandlingTests.cs‎

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namespace Serilog.Sinks.MongoDB.Tests;
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/// <summary>
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/// Tests for MongoDB error handling in MongoDbHelper.
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/// These tests verify that PR #99 correctly handles MongoDB exceptions using error codes
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/// instead of string matching, ensuring compatibility across MongoDB versions.
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/// </summary>
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[TestFixture]
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public class MongoDbHelperErrorHandlingTests
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{
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private static string MongoConnectionString => MongoTestFixture.ConnectionString;
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private const string MongoDatabaseName = "mongodb-sink-error-handling-tests";
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private const string MongoCollectionName = "test-collection";
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private static (MongoClient, IMongoDatabase) GetDatabase()
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{
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var mongoClient = new MongoClient(MongoConnectionString);
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return (mongoClient, mongoClient.GetDatabase(MongoDatabaseName));
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}
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[TearDown]
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public void Cleanup()
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{
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var mongoClient = new MongoClient(MongoConnectionString);
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mongoClient.DropDatabase(MongoDatabaseName);
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}
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#region VerifyCollectionExists Tests
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[Test]
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public void VerifyCollectionExists_WhenCollectionDoesNotExist_ShouldCreateCollection()
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{
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// Arrange
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var (mongoClient, mongoDatabase) = GetDatabase();
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var collectionName = $"{MongoCollectionName}_new";
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// Act
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mongoDatabase.VerifyCollectionExists(collectionName);
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// Assert
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var collectionExists = mongoDatabase.CollectionExists(collectionName);
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collectionExists.Should().BeTrue("Collection should be created when it doesn't exist");
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mongoClient.DropDatabase(MongoDatabaseName);
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}
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[Test]
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public void VerifyCollectionExists_WhenCollectionAlreadyExists_ShouldNotThrowException()
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{
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// Arrange
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var (mongoClient, mongoDatabase) = GetDatabase();
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var collectionName = $"{MongoCollectionName}_exists";
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// Create the collection first
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mongoDatabase.CreateCollection(collectionName);
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// Act & Assert - Should not throw when collection already exists
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var act = () => mongoDatabase.VerifyCollectionExists(collectionName);
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act.Should().NotThrow("VerifyCollectionExists should handle existing collections gracefully");
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mongoClient.DropDatabase(MongoDatabaseName);
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}
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[Test]
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public void VerifyCollectionExists_WithRaceCondition_ShouldHandleNamespaceExistsError()
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{
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// Arrange
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var (mongoClient, mongoDatabase) = GetDatabase();
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var collectionName = $"{MongoCollectionName}_race";
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// Pre-create the collection but the method doesn't know about it
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// This simulates a race condition where CollectionExists returns false
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// but the collection gets created before CreateCollection is called
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mongoDatabase.CreateCollection(collectionName);
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// Act & Assert - Even though it exists, should handle gracefully
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// The internal check will see it exists and return early,
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// but if it didn't, the catch block should handle NamespaceExists
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var act = () => mongoDatabase.VerifyCollectionExists(collectionName);
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act.Should().NotThrow("Should handle NamespaceExists error code gracefully");
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mongoClient.DropDatabase(MongoDatabaseName);
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}
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[Test]
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public void VerifyCollectionExists_WithCollectionCreationOptions_ShouldCreateWithOptions()
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{
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// Arrange
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var (mongoClient, mongoDatabase) = GetDatabase();
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var collectionName = $"{MongoCollectionName}_with_options";
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var options = new CreateCollectionOptions
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{
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Capped = true,
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MaxSize = 1024 * 1024, // 1MB
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MaxDocuments = 1000
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};
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// Act
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mongoDatabase.VerifyCollectionExists(collectionName, options);
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// Assert
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var collectionExists = mongoDatabase.CollectionExists(collectionName);
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collectionExists.Should().BeTrue("Collection should be created with options");
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mongoClient.DropDatabase(MongoDatabaseName);
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}
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#endregion
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#region VerifyExpireTTLSetup Tests
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[Test]
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public void VerifyExpireTTLSetup_WhenNoIndexExists_ShouldCreateTTLIndex()
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{
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// Arrange
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var (mongoClient, mongoDatabase) = GetDatabase();
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var collectionName = $"{MongoCollectionName}_ttl_new";
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var expireTtl = TimeSpan.FromMinutes(30);
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// Create the collection first
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mongoDatabase.CreateCollection(collectionName);
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// Act
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mongoDatabase.VerifyExpireTTLSetup(collectionName, expireTtl);
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// Assert
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var collection = mongoDatabase.GetCollection<LogEntry>(collectionName);
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var indexes = collection.Indexes.List().ToList();
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var ttlIndex = indexes.FirstOrDefault(idx =>
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idx.Contains("name") && idx["name"].AsString == "serilog_sink_expired_ttl");
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ttlIndex.Should().NotBeNull("TTL index should be created");
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ttlIndex!["expireAfterSeconds"].Should().Be((int)expireTtl.TotalSeconds);
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mongoClient.DropDatabase(MongoDatabaseName);
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}
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[Test]
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public void VerifyExpireTTLSetup_WhenIndexExistsWithSameOptions_ShouldNotThrow()
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{
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// Arrange
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var (mongoClient, mongoDatabase) = GetDatabase();
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var collectionName = $"{MongoCollectionName}_ttl_same";
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var expireTtl = TimeSpan.FromMinutes(30);
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mongoDatabase.CreateCollection(collectionName);
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var collection = mongoDatabase.GetCollection<LogEntry>(collectionName);
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// Create the TTL index first
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var indexKeysDefinition = Builders<LogEntry>.IndexKeys.Ascending(s => s.UtcTimeStamp);
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var indexOptions = new CreateIndexOptions
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{
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Name = "serilog_sink_expired_ttl",
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ExpireAfter = expireTtl
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};
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collection.Indexes.CreateOne(new CreateIndexModel<LogEntry>(indexKeysDefinition, indexOptions));
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// Act & Assert - Should not throw when index exists with same options
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var act = () => mongoDatabase.VerifyExpireTTLSetup(collectionName, expireTtl);
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act.Should().NotThrow("Should handle existing TTL index with same options");
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mongoClient.DropDatabase(MongoDatabaseName);
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}
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[Test]
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public void VerifyExpireTTLSetup_WhenIndexExistsWithDifferentOptions_ShouldRecreateIndex()
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{
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// Arrange
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var (mongoClient, mongoDatabase) = GetDatabase();
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var collectionName = $"{MongoCollectionName}_ttl_different";
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var originalExpireTtl = TimeSpan.FromMinutes(30);
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var newExpireTtl = TimeSpan.FromMinutes(60);
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mongoDatabase.CreateCollection(collectionName);
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var collection = mongoDatabase.GetCollection<LogEntry>(collectionName);
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// Create the TTL index with original expiration
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var indexKeysDefinition = Builders<LogEntry>.IndexKeys.Ascending(s => s.UtcTimeStamp);
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var originalIndexOptions = new CreateIndexOptions
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{
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Name = "serilog_sink_expired_ttl",
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ExpireAfter = originalExpireTtl
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};
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collection.Indexes.CreateOne(new CreateIndexModel<LogEntry>(indexKeysDefinition, originalIndexOptions));
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// Act - Update with different expiration time
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// This should trigger IndexOptionsConflict error code and handle it by dropping and recreating
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mongoDatabase.VerifyExpireTTLSetup(collectionName, newExpireTtl);
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// Assert
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var indexes = collection.Indexes.List().ToList();
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var ttlIndex = indexes.FirstOrDefault(idx =>
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idx.Contains("name") && idx["name"].AsString == "serilog_sink_expired_ttl");
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ttlIndex.Should().NotBeNull("TTL index should still exist");
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ttlIndex!["expireAfterSeconds"].Should().Be((int)newExpireTtl.TotalSeconds,
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"Index should be recreated with new expiration time");
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mongoClient.DropDatabase(MongoDatabaseName);
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}
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[Test]
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public void VerifyExpireTTLSetup_WhenNullExpireTTL_ShouldRemoveIndex()
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{
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// Arrange
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var (mongoClient, mongoDatabase) = GetDatabase();
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var collectionName = $"{MongoCollectionName}_ttl_remove";
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var expireTtl = TimeSpan.FromMinutes(30);
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mongoDatabase.CreateCollection(collectionName);
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var collection = mongoDatabase.GetCollection<LogEntry>(collectionName);
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// Create the TTL index first
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var indexKeysDefinition = Builders<LogEntry>.IndexKeys.Ascending(s => s.UtcTimeStamp);
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var indexOptions = new CreateIndexOptions
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{
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Name = "serilog_sink_expired_ttl",
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ExpireAfter = expireTtl
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};
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collection.Indexes.CreateOne(new CreateIndexModel<LogEntry>(indexKeysDefinition, indexOptions));
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// Act - Call with null to remove the index
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mongoDatabase.VerifyExpireTTLSetup(collectionName, null);
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// Assert
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var indexes = collection.Indexes.List().ToList();
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var ttlIndex = indexes.FirstOrDefault(idx =>
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idx.Contains("name") && idx["name"].AsString == "serilog_sink_expired_ttl");
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ttlIndex.Should().BeNull("TTL index should be removed when expireTTL is null");
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mongoClient.DropDatabase(MongoDatabaseName);
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}
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[Test]
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public void VerifyExpireTTLSetup_WhenNullExpireTTLAndNoIndex_ShouldNotThrow()
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{
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// Arrange
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var (mongoClient, mongoDatabase) = GetDatabase();
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var collectionName = $"{MongoCollectionName}_ttl_null_no_index";
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mongoDatabase.CreateCollection(collectionName);
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// Act & Assert - Should not throw when trying to remove non-existent index
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var act = () => mongoDatabase.VerifyExpireTTLSetup(collectionName, null);
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act.Should().NotThrow("Should handle removal of non-existent index gracefully");
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mongoClient.DropDatabase(MongoDatabaseName);
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}
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[Test]
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public void VerifyExpireTTLSetup_MultipleTimes_ShouldBeIdempotent()
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{
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// Arrange
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var (mongoClient, mongoDatabase) = GetDatabase();
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var collectionName = $"{MongoCollectionName}_ttl_idempotent";
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var expireTtl = TimeSpan.FromMinutes(45);
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mongoDatabase.CreateCollection(collectionName);
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// Act - Call multiple times with same expiration
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mongoDatabase.VerifyExpireTTLSetup(collectionName, expireTtl);
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mongoDatabase.VerifyExpireTTLSetup(collectionName, expireTtl);
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mongoDatabase.VerifyExpireTTLSetup(collectionName, expireTtl);
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// Assert
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var collection = mongoDatabase.GetCollection<LogEntry>(collectionName);
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var indexes = collection.Indexes.List().ToList();
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var ttlIndexes = indexes.Where(idx =>
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idx.Contains("name") && idx["name"].AsString == "serilog_sink_expired_ttl").ToList();
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ttlIndexes.Should().HaveCount(1, "Should only have one TTL index even after multiple calls");
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ttlIndexes[0]["expireAfterSeconds"].Should().Be((int)expireTtl.TotalSeconds);
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mongoClient.DropDatabase(MongoDatabaseName);
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}
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#endregion
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#region Integration Tests - Error Code Validation
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/// <summary>
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/// This test validates that the MongoDB driver actually returns CodeName "NamespaceExists"
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/// for error code 48 when a collection already exists. This ensures our fix in PR #99
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/// is compatible with the actual MongoDB behavior.
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/// Note: We need to use CreateCollectionOptions to force MongoDB to throw the exception,
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/// as calling CreateCollection without options on an existing collection is idempotent.
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/// </summary>
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[Test]
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public void MongoCommandException_WhenCollectionExists_ShouldHaveNamespaceExistsCodeName()
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{
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// Arrange
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var (mongoClient, mongoDatabase) = GetDatabase();
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var collectionName = $"{MongoCollectionName}_namespace_error";
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// Create the collection first with specific options
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var options = new CreateCollectionOptions
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{
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Capped = true,
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MaxSize = 1024 * 1024
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};
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mongoDatabase.CreateCollection(collectionName, options);
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// Act & Assert - Try to create the same collection again with different options
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MongoCommandException? caughtException = null;
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try
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{
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var differentOptions = new CreateCollectionOptions
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{
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Capped = false
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};
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mongoDatabase.CreateCollection(collectionName, differentOptions);
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}
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catch (MongoCommandException ex)
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{
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caughtException = ex;
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}
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caughtException.Should().NotBeNull("Should throw MongoCommandException when creating duplicate collection");
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caughtException!.CodeName.Should().Be("NamespaceExists",
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"MongoDB should return CodeName 'NamespaceExists' for duplicate collection");
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caughtException.Code.Should().Be(48, "Error code should be 48 for NamespaceExists");
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mongoClient.DropDatabase(MongoDatabaseName);
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}
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/// <summary>
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/// This test validates that the MongoDB driver actually returns CodeName "IndexOptionsConflict"
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/// for error code 85 when an index exists with different options. This ensures our fix in PR #99
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/// is compatible with the actual MongoDB behavior.
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/// </summary>
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[Test]
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public void MongoCommandException_WhenIndexExistsWithDifferentOptions_ShouldHaveIndexOptionsConflictCodeName()
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{
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// Arrange
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var (mongoClient, mongoDatabase) = GetDatabase();
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var collectionName = $"{MongoCollectionName}_index_error";
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mongoDatabase.CreateCollection(collectionName);
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var collection = mongoDatabase.GetCollection<LogEntry>(collectionName);
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// Create index with one expiration time
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var indexKeysDefinition = Builders<LogEntry>.IndexKeys.Ascending(s => s.UtcTimeStamp);
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var indexOptions = new CreateIndexOptions
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{
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Name = "test_ttl_index",
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ExpireAfter = TimeSpan.FromMinutes(30)
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};
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collection.Indexes.CreateOne(new CreateIndexModel<LogEntry>(indexKeysDefinition, indexOptions));
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// Act & Assert - Try to create same index with different expiration
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MongoCommandException? caughtException = null;
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try
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{
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var differentIndexOptions = new CreateIndexOptions
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{
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Name = "test_ttl_index",
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ExpireAfter = TimeSpan.FromMinutes(60)
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};
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collection.Indexes.CreateOne(new CreateIndexModel<LogEntry>(indexKeysDefinition, differentIndexOptions));
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}
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catch (MongoCommandException ex)
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{
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caughtException = ex;
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}
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caughtException.Should().NotBeNull("Should throw MongoCommandException when creating index with different options");
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caughtException!.CodeName.Should().Be("IndexOptionsConflict",
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"MongoDB should return CodeName 'IndexOptionsConflict' for index with different options");
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caughtException.Code.Should().Be(85, "Error code should be 85 for IndexOptionsConflict");
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mongoClient.DropDatabase(MongoDatabaseName);
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}
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#endregion
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}

‎test/Serilog.Sinks.MongoDB.Tests/Serilog.Sinks.MongoDB.Tests.csproj‎

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<PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.9" />
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<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="9.0.9" />
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<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
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<PackageReference Include="NSubstitute" Version="5.3.0" />
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<PackageReference Include="NUnit" Version="4.4.0" />
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<PackageReference Include="NUnit3TestAdapter" Version="5.1.0" />
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<PackageReference Include="Serilog.Settings.Configuration" Version="8.0.0" />

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