go test -run=TestHelloworld
go test -bench=BenchmarkHelloworld
go test -timeout 30s cmap -run ^(TestMap)$
test -benchmem -run=^$ cmap -bench ^(BenchmarkMapGet)$
go test -run=TestHelloworld
go test -bench=BenchmarkHelloworld
go test -timeout 30s cmap -run ^(TestMap)$
test -benchmem -run=^$ cmap -bench ^(BenchmarkMapGet)$