Crate dev_fixtures 

dev-fixtures

Repeatable test environments, sample data, and controlled inputs for Rust. Part of the dev-* verification suite.

Why

Tests are only useful if they are repeatable. AI agents in particular need fixtures that:

• Build the same way every time
• Clean themselves up
• Provide both happy-path and adversarial inputs

dev-fixtures provides primitives for building those environments.

Quick example

use dev_fixtures::TempProject;

let project = TempProject::new()
    .with_file("Cargo.toml", "[package]\nname = \"sample\"\n")
    .with_file("src/lib.rs", "pub fn answer() -> u32 { 42 }")
    .build()
    .unwrap();

// project.path() points at a temp directory.
// It is deleted automatically when `project` is dropped.

Modules

• tree — FileTree builder with workspace and symlink helpers.
• adversarial — generators for oversized, malformed, and unusual inputs.
• golden — snapshot-based verification with dev-report integration.
• mock — deterministic mock data (CSV, JSON, bytes).

Modules

adversarial

Adversarial input generators.

golden

Golden-file snapshot verification.

mock

Deterministic mock data generators.

tree

File-tree builders.

Structs

FixtureProducer

Producer wrapper that runs a self-test of fixture lifecycle and emits a Report.

TempProject

A temporary project directory that auto-cleans on drop.

TempProjectBuilder

Builder for TempProject.

Traits

Fixture

A trait for any fixture that can be set up and torn down.