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test: add comprehensive unit tests for MongoDB error handling (PR #99) (#100)
* 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). * ci: skip NuGet package generation during test runs Update the GitHub Actions workflow to add `-p:GeneratePackageOnBuild=false` to the dotnet test command. This prevents unnecessary package creation during CI test runs, improving build performance. The project has `<GeneratePackageOnBuild>true</GeneratePackageOnBuild>` set, which causes packages to be created on every build, including test runs. Packages are still properly created during the "Pack" step for releases. Benefits: - Faster CI test execution - Cleaner build output - Packages only created when actually needed (Release builds) * test: address CodeRabbit review suggestions Apply all CodeRabbit nitpick suggestions to improve test quality: 1. **Test Isolation**: Add [NonParallelizable] attribute to prevent concurrent test execution issues when using shared database name 2. **Dependency Management**: Add PrivateAssets="all" to NSubstitute package reference to prevent transitive dependency exposure 3. **Cleanup Optimization**: Remove redundant DropDatabase calls within test methods since cleanup is handled by [TearDown] 4. **Cross-Version Compatibility**: Fix TTL assertion type handling to support MongoDB's Int64/Double serialization variations across server versions by using Convert.ToInt64() 5. **Race Condition Testing**: Improve authenticity of race condition test by using Parallel.Invoke() to force genuine concurrent collection creation attempts, exercising the actual NamespaceExists error path All 12 tests continue to pass. These changes improve test robustness, reduce runtime overhead, and ensure compatibility across MongoDB versions.
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‎.github/workflows/deploy.yml‎

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useConfigFile: true
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- name: Run Tests
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run: dotnet test
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run: dotnet test -p:GeneratePackageOnBuild=false
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- name: Pack
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run: dotnet build -c Release -p:PackageVersion=${{ steps.gitversion.outputs.nuGetVersion }} -p:IncludeSymbols=true -p:SymbolPackageFormat=snupkg

‎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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[NonParallelizable]
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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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}
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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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}
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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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}
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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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// Act & Assert - Simulate race condition by calling verify concurrently
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// This forces actual NamespaceExists exceptions when multiple threads
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// try to create the same collection simultaneously
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var act = () => Parallel.Invoke(
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() => mongoDatabase.VerifyCollectionExists(collectionName),
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() => mongoDatabase.VerifyCollectionExists(collectionName),
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() => mongoDatabase.VerifyCollectionExists(collectionName)
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);
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act.Should().NotThrow("Should handle NamespaceExists error code gracefully during concurrent creation");
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// Verify the collection was created successfully
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mongoDatabase.CollectionExists(collectionName).Should().BeTrue();
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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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}
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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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// Convert to long to handle MongoDB's potential Int64 or Double serialization across versions
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Convert.ToInt64(ttlIndex!["expireAfterSeconds"].ToDouble())
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.Should().Be((long)expireTtl.TotalSeconds);
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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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}
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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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// Convert to long to handle MongoDB's potential Int64 or Double serialization across versions
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Convert.ToInt64(ttlIndex!["expireAfterSeconds"].ToDouble())
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.Should().Be((long)newExpireTtl.TotalSeconds,
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"Index should be recreated with new expiration time");
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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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}
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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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}
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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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// Convert to long to handle MongoDB's potential Int64 or Double serialization across versions
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Convert.ToInt64(ttlIndexes[0]["expireAfterSeconds"].ToDouble())
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.Should().Be((long)expireTtl.TotalSeconds);
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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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}
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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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}
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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" PrivateAssets="all" />
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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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