Unit test fails in golang:1.13-alpine due to path assumption

[bnevis-i]

🐞 Bug Report

Affected Services

security-file-token-provider (security-secretstore-setup)

Description and Minimal Reproduction

Currently in the Jenkins job, the tests run on the physical host. In the new pipeline everything runs in the context of the golang:1.13-alpine image. When I switched to this the go test command started failing in this test:

00:03:26.562  --- FAIL: TestCreatesFile (0.00s)
00:03:26.562      tokenprovider_linux_test.go:55: 
00:03:26.562          	Error Trace:	tokenprovider_linux_test.go:55
00:03:26.562          	Error:      	Received unexpected error:
00:03:26.562          	            	open /tmp/tokenprovider_linux_test.dat: no such file or directory
00:03:26.562          	Test:       	TestCreatesFile
00:03:26.562  FAIL
00:03:26.562  coverage: 26.2% of statements
00:03:26.562  FAIL	github.com/edgexfoundry/edgex-go/internal/security/secretstore	0.034s

After lots of trial and error I traced to the issue to this line in this file: internal/security/secretstore/tokenprovider_linux_test.go

TokenProvider:     "/usr/bin/touch"

docker run --rm -it golang:1.13-alpine sh
$ /usr/bin/touch
sh: /usr/bin/touch: not found

In alpine touch is not at this path.