dh_auto_test failed because of changing dir

[Tong Sun <suntong001@users.sourceforge.net>]

Hi,

My Go code builds fine under travis-ci
https://travis-ci.org/go-easygen/easygen/builds/407328951?utm_source=github_status&utm_medium=notification

I.e.,

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$ go test -v ./...
=== RUN   TestStringManipulation
--- PASS: TestStringManipulation (0.00s)
=== RUN   ExampleProcess0_list0StrTemplate
--- PASS: ExampleProcess0_list0StrTemplate (0.00s)
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However, when I'm building it (with gbp buildpackage) within my
packaging process, `dh_auto_test` failed, and I think it's because
`dh_auto_test` change dir from my default code place first:

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github.com/go-easygen/easygen
github.com/go-easygen/easygen/egVar
github.com/go-easygen/easygen/egCal
github.com/go-easygen/easygen/cmd/easygen
   dh_auto_test -O--buildsystem=golang
        cd obj-x86_64-linux-gnu && go test -vet=off -v -p 2
github.com/go-easygen/easygen
github.com/go-easygen/easygen/cmd/easygen
github.com/go-easygen/easygen/egCal
github.com/go-easygen/easygen/egVar
=== RUN   TestStringManipulation
[easygen] Fatal error - DataFile 'test/strings' cannot be found
FAIL    github.com/go-easygen/easygen   0.004s
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How to fix it?

Here is my debian/rules file BTW:

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#!/usr/bin/make -f

BINPKG := easygen
LIBPKG := golang-github-go-easygen-easygen-dev

override_dh_auto_install:
dh_auto_install # -- --no-source
dh_install -p$(BINPKG) usr/bin/easygen
dh_install -p$(LIBPKG) usr/share/gocode

%:
dh $@ --buildsystem=golang --with=golang
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thx!