# mock_instant
## mock_instant
This crate allows you to test Instant/Duration code, deterministically **_per thread_**.
If cross-thread determinism is required, enable the `sync` feature:
```toml
mock_instant = { version = "0.2", features = ["sync"] }
```
It provides a replacement `std::time::Instant` that uses a deterministic thread-local 'clock'
You can swap out the `std::time::Instant` with this one by doing something similar to:
```rust
#[cfg(test)]
use mock_instant::Instant;
#[cfg(not(test))]
use std::time::Instant;
```
## Example
```rust
use std::time::Duration;
let now = Instant::now();
MockClock::advance(Duration::from_secs(15));
MockClock::advance(Duration::from_secs(2));
// its been '17' seconds
assert_eq!(now.elapsed(), Duration::from_secs(17));
```
License: 0BSD