Struct LabTestConfig 

pub struct LabTestConfig {
    pub seed: u64,
    pub chaos_enabled: bool,
    pub chaos_intensity: f64,
    pub max_steps: Option<u64>,
    pub capture_traces: bool,
}

Configuration for Lab-based deterministic testing.

This configuration controls how the Lab runtime executes tests, including virtual time, chaos injection, and deterministic scheduling.

Example

use fastapi_core::testing::{LabTestConfig, LabTestClient};

// Basic deterministic test
let config = LabTestConfig::new(42);
let client = LabTestClient::with_config(my_handler, config);

// With chaos injection for stress testing
let config = LabTestConfig::new(42).with_light_chaos();
let client = LabTestClient::with_config(my_handler, config);

Fields

seed: u64

Seed for deterministic scheduling.

chaos_enabled: bool

Whether to enable chaos injection.

chaos_intensity: f64

Chaos intensity (0.0 = none, 1.0 = max).

max_steps: Option<u64>

Maximum steps before timeout (prevents infinite loops).

capture_traces: bool

Whether to capture traces for debugging.

Implementations

impl LabTestConfig

pub fn new(seed: u64) -> Self

Creates a new Lab test configuration with the given seed.

pub fn with_light_chaos(self) -> Self

Enables light chaos injection (1% cancel, 5% delay).

Suitable for CI pipelines - catches obvious bugs without excessive flakiness.

pub fn with_heavy_chaos(self) -> Self

Enables heavy chaos injection (10% cancel, 20% delay).

Suitable for thorough stress testing before releases.

pub fn with_chaos_intensity(self, intensity: f64) -> Self

Sets custom chaos intensity (0.0 to 1.0).

pub fn with_max_steps(self, max: u64) -> Self

Sets the maximum number of steps before timeout.

pub fn without_step_limit(self) -> Self

Disables the step limit (use with caution).

pub fn with_traces(self) -> Self

Enables trace capture for debugging.

Trait Implementations

impl Clone for LabTestConfig

fn clone(&self) -> LabTestConfig

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for LabTestConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for LabTestConfig

fn default() -> Self

Returns the “default value” for a type.