    t.go:106: 2024-11-18 07:44:25.939 [debu]  w2: dial tcp  addr_port="[fd7a:115c:a1e0:46cc:bd8e:400d:1bc6:f6ac]:35565"    t.go:106: 2024-11-18 07:44:25.943 [debu]  w1.net.netstack: netstack: could not connect to local server at 127.0.0.1:35565 (or [::1]:35565)%!(EXTRA *net.OpError=dial tcp [::1]:35565: connect: connection refused)    conn_test.go:146:        Error Trace:/Users/spike/repos/coder/tailnet/conn_test.go:146        Error:      Received unexpected error:                    connect tcp [fd7a:115c:a1e0:46cc:bd8e:400d:1bc6:f6ac]:35565: connection was refused        Test:       TestTailnet/ForcesWebSockets    t.go:106: 2024-11-18 07:44:25.945 [info]  w1: closing tailnet Conn    t.go:106: 2024-11-18 07:44:25.945 [debu]  w1: closing configMaps configLoop    t.go:106: 2024-11-18 07:44:25.945 [debu]  w1: closing nodeUpdater updateLoop    t.go:106: 2024-11-18 07:44:25.945 [debu]  w1: closed netstack    conn_test.go:135:        Error Trace:/Users/spike/repos/coder/tailnet/conn_test.go:135                    /Users/spike/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.22.8.darwin-arm64/src/runtime/asm_arm64.s:1222        Error:      Received unexpected error:                    connection closed:                        github.com/coder/coder/v2/tailnet.init                            <autogenerated>:1        Test:       TestTailnet/ForcesWebSocketspanic: runtime error: invalid memory address or nil pointer dereference[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x1039771dc]goroutine 2224 [running]:github.com/coder/coder/v2/tailnet_test.TestTailnet.func3.2()/Users/spike/repos/coder/tailnet/conn_test.go:136 +0x7ccreated by github.com/coder/coder/v2/tailnet_test.TestTailnet.func3 in goroutine 109/Users/spike/repos/coder/tailnet/conn_test.go:133 +0x7dc

Test didn't synchronize listening on the port before dialing it.

It also has a nil pointer deference when the test fails, which causes a bunch of unrelated output. Also fixed.