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Harry Harpham 61ac021c5d wgengine/magicsock: assume network up for tests ... Without this, any test relying on underlying use of magicsock will fail without network connectivity, even when the test logic has no need for a network connection. Tests currently in this bucket include many in tstest/integration and in tsnet. Further explanation: ipn only becomes Running when it sees at least one live peer or DERP connection: 0cc1b2ff76/ipn/ipnlocal/local.go (L5861-L5866) When tests only use a single node, they will never see a peer, so the node has to wait to see a DERP server. magicsock sets the preferred DERP server in updateNetInfo(), but this function returns early if the network is down. 0cc1b2ff76/wgengine/magicsock/magicsock.go (L1053-L1106) Because we're checking the real network, this prevents ipn from entering "Running" and causes the test to fail or hang. In tests, we can assume the network is up unless we're explicitly testing the behaviour of tailscaled when the network is down. We do something similar in magicsock/derp.go, where we assume we're connected to control unless explicitly testing otherwise: 7d2101f352/wgengine/magicsock/derp.go (L166-L177) This is the template for the changes to `networkDown()`. Fixes #17122 Co-authored-by: Alex Chan <alexc@tailscale.com> Signed-off-by: Harry Harpham <harry@tailscale.com>		2 weeks ago
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featureknob	all: remove AUTHORS file and references to it	3 months ago
logknob	all: remove AUTHORS file and references to it	3 months ago
envknob.go	wgengine/magicsock: assume network up for tests	2 weeks ago
envknob_nottest.go	all: remove AUTHORS file and references to it	3 months ago
envknob_testable.go	all: remove AUTHORS file and references to it	3 months ago