When writing files to the InMemory store, can I control the last_modified date for unit testing?

[thekatze]

I’m developing a service that compacts Parquet files in cloud storage and use the InMemory store for end-to-end testing. It works well for validating state after writes, but it currently lacks the ability to control or mock the last_modified timestamp of stored objects.

Currently, put in the InMemory store implementation always sets last_modified using Utc::now(), with no clear way to override it.

Is there an existing mechanism to override this behavior that I missed?
If not, should we introduce a time provider API? For example:

let mock_time = Arc::new(MockTimeProvider::new(Utc::now()));
let store = InMemory::new().with_time_provider(mock_time.clone());

store.put();
mock_time.advance(TimeDelta::hours(1));
store.put();

Proof of concept gist

This would enable tests that depend on time-based logic, such as verifying lockfile expiration or deleting files older than a certain age.

If this approach is acceptable, I’m willing to open a PR implementing it.