launchpad.net/ubuntu-push/client/service tests fail when GOMAXPROCS>1

This is true with Go 1.4 too, but the default has changed with 1.5:

mwhudson@glamdring:ubuntu-push$ ~/go1.4/bin/go test -a -c launchpad.net/ubuntu-push/client/service
mwhudson@glamdring:ubuntu-push$ for i in 1 2 3 4 5 6 7 8 9 10; do GOMAXPROCS=4 ./service.test 2>/dev/null | egrep 'PASS|FAIL'; done
FAIL: <autogenerated>:80: ualPostalSuite.TestHandleMMUActionsDispatches
--- FAIL: TestService-4 (0.04s)
FAIL
FAIL: <autogenerated>:41: trivialPostalSuite.TestHandleMMUActionsDispatches
--- FAIL: TestService-4 (0.04s)
FAIL
--- FAIL: TestService-4 (0.04s)
FAIL
--- FAIL: TestService-4 (0.04s)
FAIL
FAIL: <autogenerated>:80: ualPostalSuite.TestHandleMMUActionsDispatches
--- FAIL: TestService-4 (0.04s)
FAIL
PASS
FAIL: <autogenerated>:41: trivialPostalSuite.TestHandleMMUActionsDispatches
--- FAIL: TestService-4 (0.05s)
FAIL
PASS
--- FAIL: TestService-4 (0.04s)
FAIL
FAIL: <autogenerated>:41: trivialPostalSuite.TestHandleMMUActionsDispatches
--- FAIL: TestService-4 (0.05s)
FAIL

I don't know if more thinking is more appropriate, but putting runtime.GOMAXPROCS(1) into TestService fixes this.