test feature

[djc]

The design in 4383fcc seems a little surprising. What is the test feature intended to do? Is there a reason not to use #[cfg(test)] directly? It seems kinda strange that running the tests requires the test feature (otherwise a bunch of tests fail). Usually Cargo features should be additive, such that code compiles (and passes tests) whether the feature is enabled or not.

[mdecimus]

The test feature enables the mock resolver and disables all DNS lookups. I needed to be able to use this feature from outside the library but cargo does not yet support automatically enabling features when running cargo test. Anyway, I fixed it with the following workaround:

#[cfg(any(test, feature = "test"))]