test: add comprehensive unit tests for MongoDB error handling (PR #99) #100
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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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WalkthroughThe pull request adds comprehensive test coverage for MongoDB error handling in MongoDbHelper. A new test suite with 12 test methods validates collection creation, TTL index management, and exception handling. The NSubstitute mocking library was added as a test dependency to support these tests. Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes The review requires understanding 12 distinct test scenarios with varying MongoDB error handling paths, mock setup across multiple tests, and validation of specific MongoDB error codes (NamespaceExists, IndexOptionsConflict). While the tests follow consistent patterns, each scenario requires individual reasoning about expected behavior and error conditions. Possibly related PRs
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Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
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🧹 Nitpick comments (6)
test/Serilog.Sinks.MongoDB.Tests/Serilog.Sinks.MongoDB.Tests.csproj (1)
16-16: Optional: mark test-only dependency as PrivateAssets.Prevents accidental transitive exposure if the test project is referenced elsewhere (rare, but safe).
- <PackageReference Include="NSubstitute" Version="5.3.0" /> + <PackageReference Include="NSubstitute" Version="5.3.0" PrivateAssets="all" />test/Serilog.Sinks.MongoDB.Tests/MongoDbHelperErrorHandlingTests.cs (5)
8-16: Avoid cross-test interference: use NonParallelizable or per-test DB names.Current constant DB name plus per-test drops risks flaky behavior if tests run in parallel. Two options:
- Easiest: mark the fixture as non-parallelizable.
- Better isolation: generate a unique DB name per test (e.g., in SetUp) and use it in GetDatabase and TearDown.
[TestFixture] + [NonParallelizable] public class MongoDbHelperErrorHandlingTests { - private const string MongoDatabaseName = "mongodb-sink-error-handling-tests"; + // Option A (keep NonParallelizable): keep constant name. + private const string MongoDatabaseName = "mongodb-sink-error-handling-tests"; + + // Option B (per-test isolation): + // private string _dbName = null!; + // + // [SetUp] + // public void SetUp() => _dbName = $"mongodb_sink_tests_{Guid.NewGuid():N}"; + // + // private (MongoClient, IMongoDatabase) GetDatabase() + // { + // var mongoClient = new MongoClient(MongoConnectionString); + // return (mongoClient, mongoClient.GetDatabase(_dbName)); + // } + // + // [TearDown] + // public void Cleanup() + // { + // var mongoClient = new MongoClient(MongoConnectionString); + // mongoClient.DropDatabase(_dbName); + // }If your NUnit settings already disable parallelization globally, Option A alone is sufficient. Otherwise prefer Option B.
46-47: Remove redundant DropDatabase calls inside tests.You already drop the DB in [TearDown]. The extra drops increase runtime and can amplify race risks.
- mongoClient.DropDatabase(MongoDatabaseName); + // Dropped in [TearDown]Also applies to: 63-64, 84-85, 107-108, 137-138, 164-165, 201-202, 234-235, 250-251, 277-278, 326-327, 374-375
66-85: “Race condition” test doesn’t exercise the catch path; make it truly concurrent.As written, the early existence check returns before CreateCollection, so no NamespaceExists path is exercised. Drive real concurrency to validate the handler.
- [Test] - public void VerifyCollectionExists_WithRaceCondition_ShouldHandleNamespaceExistsError() - { - // Arrange - var (mongoClient, mongoDatabase) = GetDatabase(); - var collectionName = $"{MongoCollectionName}_race"; - - // Pre-create the collection but the method doesn't know about it - // This simulates a race condition where CollectionExists returns false - // but the collection gets created before CreateCollection is called - mongoDatabase.CreateCollection(collectionName); - - // Act & Assert - Even though it exists, should handle gracefully - // The internal check will see it exists and return early, - // but if it didn't, the catch block should handle NamespaceExists - var act = () => mongoDatabase.VerifyCollectionExists(collectionName); - act.Should().NotThrow("Should handle NamespaceExists error code gracefully"); - } + [Test] + public void VerifyCollectionExists_WithRaceCondition_ShouldHandleNamespaceExistsError() + { + // Arrange + var (_, mongoDatabase) = GetDatabase(); + var collectionName = $"{MongoCollectionName}_race"; + + // Act: run two concurrent creations to force one CreateCollection to hit NamespaceExists + Action a = () => mongoDatabase.VerifyCollectionExists(collectionName); + Action b = () => mongoDatabase.VerifyCollectionExists(collectionName); + + // Assert + Action act = () => Parallel.Invoke(a, b); + act.Should().NotThrow("Concurrent VerifyCollectionExists calls must tolerate NamespaceExists"); + mongoDatabase.CollectionExists(collectionName).Should().BeTrue(); + }
132-136: Make TTL comparisons robust to BSON numeric type (int/long/double).Some servers/drivers serialize expireAfterSeconds as Int64 or Double. Normalize before asserting.
- ttlIndex!["expireAfterSeconds"].Should().Be((int)expireTtl.TotalSeconds); + Convert.ToInt64(ttlIndex!["expireAfterSeconds"].ToDouble()) + .Should().Be((long)expireTtl.TotalSeconds);- ttlIndex!["expireAfterSeconds"].Should().Be((int)newExpireTtl.TotalSeconds, - "Index should be recreated with new expiration time"); + Convert.ToInt64(ttlIndex!["expireAfterSeconds"].ToDouble()) + .Should().Be((long)newExpireTtl.TotalSeconds, + "Index should be recreated with new expiration time");- ttlIndexes[0]["expireAfterSeconds"].Should().Be((int)expireTtl.TotalSeconds); + Convert.ToInt64(ttlIndexes[0]["expireAfterSeconds"].ToDouble()) + .Should().Be((long)expireTtl.TotalSeconds);Also applies to: 197-200, 274-276
88-106: Optional: assert collection options were honored.You verify existence but not that Capped/MaxSize/MaxDocuments persisted. Consider validating via listCollections filter.
var spec = mongoDatabase.ListCollections( new ListCollectionsOptions { Filter = new BsonDocument("name", collectionName) }) .FirstOrDefault(); spec.Should().NotBeNull(); spec!["options"]["capped"].AsBoolean.Should().BeTrue(); spec["options"]["size"].ToInt64().Should().Be(1024 * 1024); spec["options"]["max"].ToInt64().Should().Be(1000);
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📒 Files selected for processing (3)
test/Serilog.Sinks.MongoDB.Tests/GlobalUsings.cs(1 hunks)test/Serilog.Sinks.MongoDB.Tests/MongoDbHelperErrorHandlingTests.cs(1 hunks)test/Serilog.Sinks.MongoDB.Tests/Serilog.Sinks.MongoDB.Tests.csproj(1 hunks)
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🧬 Code graph analysis (1)
test/Serilog.Sinks.MongoDB.Tests/MongoDbHelperErrorHandlingTests.cs (2)
src/Serilog.Sinks.MongoDB/Sinks/MongoDB/MongoDBSinkBase.cs (1)
IMongoDatabase(67-87)src/Serilog.Sinks.MongoDB/Helpers/MongoDbHelpers.cs (3)
VerifyCollectionExists(47-65)CollectionExists(33-39)VerifyExpireTTLSetup(67-119)
🔇 Additional comments (1)
test/Serilog.Sinks.MongoDB.Tests/GlobalUsings.cs (1)
16-17: LGTM: global using aligns with new test dependency.No issues; consistent with csproj changes.
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)
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.
Update version and release notes for v7.2.0 release: Changes: - MongoDB v7.x compatibility fix using error codes (#98, #99) Thanks to @ntark for the PR! - Comprehensive unit tests for error handling (#100) - CI workflow optimization Updated files: - CHANGES.md: Added v7.2.0 release notes with contributor attribution - README.md: Updated "What's New" section and added link to CHANGES.md - Serilog.Sinks.MongoDB.csproj: Bumped version to 7.2.0, updated copyright year to 2025, and updated PackageReleaseNotes
Summary
This PR adds comprehensive unit tests to validate the MongoDB error handling fix introduced in PR #99, which changed from string-based error matching to using MongoDB error codes (
CodeName).Motivation
PR #99 fixed a critical bug where error handling failed in MongoDB 7.x due to changes in error message format. These tests ensure:
Changes
Test Coverage (12 new tests)
✅ VerifyCollectionExists Error Handling
✅ VerifyExpireTTLSetup Error Handling
✅ MongoDB Driver Error Code Validation
CodeName = "NamespaceExists"for error code 48CodeName = "IndexOptionsConflict"for error code 85Dependencies
Test Results
Key Features
Related
Reviewer Notes
All tests use the existing test infrastructure (MongoTestFixture with EphemeralMongo). The tests exercise real MongoDB operations to ensure the error code handling is accurate and reliable.
Summary by CodeRabbit
Tests
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