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A fully featured, in-process fake for the Google Cloud BigQuery SDK for .NET — purpose-built for fast, reliable component and integration testing.

No external processes, no Docker, no network — just add the NuGet package and go:

// Dependency Injection (WebApplicationFactory / integration tests)
serviceCollection.UseInMemoryBigQuery();

// Direct instantiation (full SDK fidelity)
using var bq = InMemoryBigQuery.Create("test-project", "my_dataset", ds =>
{
    ds.AddTable("users", new TableSchemaBuilder
    {
        { "id", BigQueryDbType.Int64 },
        { "name", BigQueryDbType.String },
    }.Build());
});

Full support for dataset/table CRUD, streaming inserts, SQL queries (325+ GoogleSQL functions), DML, DDL, views, parameterised queries, fault injection, request/query logging, and more.

Documentation

Guide	Description
Getting Started	Installation, quick start, first test
How It Works	HTTP interception strategy, SDK pipeline details
Setup Guide	Direct instantiation, DI integration, builder pattern
SQL Queries	GoogleSQL reference — clauses, operators, 325+ built-in functions
Features	Streaming inserts, DML, DDL, views, partitioning, fault injection, and more
API Reference	Complete class and method reference
Known Limitations	Limitations, behavioural differences, and intentionally out-of-scope areas
Troubleshooting	Common errors and how to fix them
Seeding Data	Builder callbacks, SDK methods, state persistence
State Persistence	Export/import table state as JSON