"go test ./..." meet error

When I try to using ‘go test ./…’ within .drone.yml, it will meet error sometimes:

.drone.yml

kind: pipeline
name: default

workspace:
  base: /go
  path: src/ai-apiserver

steps:
- name: test
  image: golang:1.11
  commands: 
  - go test ./...

and the result of activity feed is as following:

Any idea about this?