Add tests for ClosureOnce. #41
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We check that we can call a ClosureOnce once successfully, but it’s an error to call it twice. Normally if this error occurs, the program exits (code 2), because it isn’t safe to panic when calling a callback. However, in cfg(test) this error results in a panic so that we can test the error using #[should_panic].
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We check that we can call a
ClosureOnceonce successfully, but calling it a second time is an error. Normally if this error occurs, the program exits (code 2), because it isn’t safe to panic when calling an FFI callback. However, incfg(test)this error instead causes a panic, so that we can test the error using#[should_panic].