Dev.to
7/8/2026

Stop writing a test-data builder for every class in .NET
Short summary
XModelBuilder is a .NET library that generates fluent test-data builders for any C# class, eliminating the need to write a separate builder per class. It supports deep property paths, indexers, seeded random data via Bogus/Faker integration, and DI-registered per-type defaults. The library also includes an untyped layer for Gherkin table integration, making it useful for BDD-style test scenarios.
- •XModelBuilder provides fluent builders for any C# class without per-class boilerplate
- •Supports deep paths, indexers, seeded fakers, and BuildMany for batch creation
- •Includes untyped layer for Gherkin tables and BDD scenarios
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