Where is testing source for BTreeSet?

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1

This is a silly one, I feel stupid! The BTreeSet tests have this:

use crate::testing::crash_test::{CrashTestDummy, Panic};
use crate::testing::rng::DeterministicRng;

But I cannot find the source for the testing module. Where is it?

2

Oh typical, after looking for 20 minutes I could not find it, now I asked I found it in 2 minutes here:

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