[bug] build-time test fail in chroot

[werdahias]

I'm packaging go-paths-helper for Debian as prerequisite for arduino-cli. It builds fine, however the tests fail like this:

  dh_auto_test -O--builddirectory=_build -O--buildsystem=golang
	cd _build && go test -vet=off -v -p 14 github.com/arduino/go-paths-helper
=== RUN   TestGzipGunzip
--- PASS: TestGzipGunzip (0.00s)
=== RUN   TestListConstructors
--- PASS: TestListConstructors (0.00s)
=== RUN   TestListSorting
--- PASS: TestListSorting (0.00s)
=== RUN   TestListFilters
--- PASS: TestListFilters (0.00s)
=== RUN   TestPathNew
--- PASS: TestPathNew (0.00s)
=== RUN   TestPath
--- PASS: TestPath (0.00s)
=== RUN   TestResetStatCacheWhenFollowingSymlink
--- PASS: TestResetStatCacheWhenFollowingSymlink (0.00s)
=== RUN   TestIsInsideDir
--- PASS: TestIsInsideDir (0.00s)
=== RUN   TestReadFileAsLines
--- PASS: TestReadFileAsLines (0.00s)
=== RUN   TestCanonicaTempDir
--- PASS: TestCanonicaTempDir (0.00s)
=== RUN   TestCopyDir
--- PASS: TestCopyDir (0.00s)
=== RUN   TestParents
--- PASS: TestParents (0.00s)
=== RUN   TestFilterDirs
--- PASS: TestFilterDirs (0.00s)
=== RUN   TestFilterOutDirs
   paths_test.go:313: 
       	Error Trace:	/build/reproducible-path/golang-github-arduino-go-paths-helper-1.13.1/_build/src/github.com/arduino/go-paths-helper/paths_test.go:313
       	Error:      	"[testdata/broken_symlink/dir_1/file2 testdata/broken_symlink/dir_1/linked_dir testdata/broken_symlink/dir_1/linked_dir/file1 testdata/broken_symlink/dir_1/linked_file testdata/broken_symlink/dir_1/real_dir testdata/broken_symlink/dir_1/real_dir/file1]" should have 7 item(s), but has 6
       	Test:       	TestFilterOutDirs
--- FAIL: TestFilterOutDirs (0.00s)
=== RUN   TestEquivalentPaths
--- PASS: TestEquivalentPaths (0.00s)
=== RUN   TestCanonicalize
--- PASS: TestCanonicalize (0.00s)
=== RUN   TestRelativeTo
--- PASS: TestRelativeTo (0.00s)
=== RUN   TestWriteToTempFile
--- PASS: TestWriteToTempFile (0.00s)
=== RUN   TestCopyToSamePath
--- PASS: TestCopyToSamePath (0.00s)
=== RUN   TestProcessWithinContext
--- PASS: TestProcessWithinContext (0.40s)
=== RUN   TestKillProcessGroupOnLinux
--- PASS: TestKillProcessGroupOnLinux (1.00s)
=== RUN   TestReadDirRecursive
--- PASS: TestReadDirRecursive (0.00s)
=== RUN   TestReadDirRecursiveSymLinkLoop
directories symlink loop detected
directories symlink loop detected
--- PASS: TestReadDirRecursiveSymLinkLoop (0.00s)
=== RUN   TestReadDirFiltered
--- PASS: TestReadDirFiltered (0.00s)
=== RUN   TestReadDirRecursiveFiltered
--- PASS: TestReadDirRecursiveFiltered (0.00s)
=== RUN   TestReadDirRecursiveLoopDetection
   readdir_test.go:312: 
       	Error Trace:	/build/reproducible-path/golang-github-arduino-go-paths-helper-1.13.1/_build/src/github.com/arduino/go-paths-helper/readdir_test.go:312
       	Error:      	"[testdata/loops/regular_3/dir1 testdata/loops/regular_3/dir1/file1 testdata/loops/regular_3/dir2 testdata/loops/regular_3/dir2/dir1 testdata/loops/regular_3/dir2/dir1/file1 testdata/loops/regular_3/dir2/file2]" should have 7 item(s), but has 6
       	Test:       	TestReadDirRecursiveLoopDetection
--- FAIL: TestReadDirRecursiveLoopDetection (0.07s)
FAIL
FAIL	github.com/arduino/go-paths-helper	1.481s
FAIL
dh_auto_test: error: cd _build && go test -vet=off -v -p 14 github.com/arduino/go-paths-helper returned exit code 1

The build runs inside a chroot; any pointers to why the test fails here ? Looks like a one-off bug to me