TestGenerateFromEvents race condition

[adrianlzt]

Several executions of the generator_test.go returns different outputs (I have deleted the rest of _test.go files).

$ go version  
go version go1.7.5 linux/amd64

$ git log -1
commit cb6223c73c82c4fbecae3a8d972d856ed6f026db

$ go test -v                 
=== RUN   TestGenerateFromEvents
--- FAIL: TestGenerateFromEvents (0.58s)
	generator_test.go:204: expected: 8dfafdbc3a40.5. got: 8dfafdbc3a40.6
	generator_test.go:204: expected: 8dfafdbc3a40.6. got: 8dfafdbc3a40.7
	generator_test.go:204: expected: 8dfafdbc3a40.7. got: 8dfafdbc3a40.5
FAIL
exit status 1
FAIL	_/var/tmp/docker-gen	0.584s

$ go test -v
=== RUN   TestGenerateFromEvents
--- PASS: TestGenerateFromEvents (0.58s)
PASS
ok  	_/var/tmp/docker-gen	0.585s

$ go test -v
=== RUN   TestGenerateFromEvents
--- FAIL: TestGenerateFromEvents (0.60s)
	generator_test.go:204: expected: 8dfafdbc3a40.6. got: 8dfafdbc3a40.7
	generator_test.go:204: expected: 8dfafdbc3a40.7. got: 8dfafdbc3a40.6
FAIL
exit status 1
FAIL	_/var/tmp/docker-gen	0.601s

$ go test -v          
=== RUN   TestGenerateFromEvents
--- PASS: TestGenerateFromEvents (0.58s)
PASS
ok  	_/var/tmp/docker-gen	0.585s

$ go test -v
=== RUN   TestGenerateFromEvents
--- PASS: TestGenerateFromEvents (0.58s)
PASS
ok  	_/var/tmp/docker-gen	0.585s

$ go test -v
=== RUN   TestGenerateFromEvents
--- PASS: TestGenerateFromEvents (0.58s)
PASS
ok  	_/var/tmp/docker-gen	0.585s

$ go test -v
=== RUN   TestGenerateFromEvents
--- FAIL: TestGenerateFromEvents (0.58s)
	generator_test.go:204: expected: 8dfafdbc3a40.6. got: 8dfafdbc3a40.7
	generator_test.go:204: expected: 8dfafdbc3a40.7. got: 8dfafdbc3a40.6
FAIL
exit status 1
FAIL	_/var/tmp/docker-gen	0.586s