Choosing Your Approach

Choosing Your Approach

At a Glance

Approach	Best For	DI Required?	Prod Changes?
InMemoryMongo.Create<T>()	Unit tests, simple scenarios	No	No
InMemoryMongo.Builder()	Multi-collection unit tests	No	No
UseInMemoryMongoDB()	Integration tests with DI	Yes	No
UseInMemoryMongoCollections()	Collection-only DI replacement	Yes	No
Custom factory	Advanced DI scenarios	Yes	No

Decision Flowchart

Are you using Dependency Injection?
├── No
│   ├── Single collection? → InMemoryMongo.Create<T>()
│   └── Multiple collections? → InMemoryMongo.Builder()
│
└── Yes
    ├── Need to replace IMongoClient + IMongoDatabase + IMongoCollection<T>?
    │   └── Yes → UseInMemoryMongoDB()
    │
    ├── Only need IMongoCollection<T> replacements?
    │   └── Yes → UseInMemoryMongoCollections()
    │
    └── Custom factory interface?
        └── Yes → Manual implementation (see Setup Guide Pattern 5)

Recommendation

For most projects, use:

• InMemoryMongo.Create<T>() for unit tests
• UseInMemoryMongoDB() for integration tests

These cover 90%+ of use cases with zero configuration.

See Also

• Setup Guide — Detailed patterns with code examples
• Getting Started — Quick start