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If a crate has tests, I often look at some of those right after the documentation. (Not the "corner case" tests, but the "correct behavior" tests.) And if a crate has other crates depending on it, I'll look at a couple of its high-profile users for large-scale examples.
This also has some risk depending on how old the crate is. The first thing I wrote at all for Diesel was a test, and tests from those days haven't really been touched unless they stopped compiling, meaning they don't look anything like what I'd expect real code to look like
