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riccardom
947e25288f
Moving discovery to first use regressed the privileged suites on the three platforms that always build an ICE bind: Darwin, FreeBSD and Windows time out in TestWGIface_UpdateAddr, TestRecreation, TestEngine_SSH and TestEngine_MultiplePeers, while Linux stays green because a host with the WireGuard kernel module takes the kernel-device branch and never drives the mux that asks for interfaces. interfaceFilter probes with wgctrl every interface the disallow list does not already exclude. Discovering at construction ran that probe before the caller had an overlay interface of its own; discovering at first use runs it after, so on a userspace WireGuard platform the probe reaches the UAPI socket of the same process. The tests reach it because they construct with a nil disallow list, where the client passes DefaultInterfaceBlacklist and its own interface is excluded by prefix. Restore the original timing with an explicit warm-up. The constructors stay infallible and the error is still reported by the accessor that needs the interfaces, so the contract this branch is about is unchanged.