package packer type TestArtifact struct{} func (*TestArtifact) BuilderId() string { return "bid" } func (*TestArtifact) Files() []string { return []string{"a", "b"} } func (*TestArtifact) Id() string { return "id" } func (*TestArtifact) String() string { return "string" } func (*TestArtifact) Destroy() error { return nil }