Go测试在Makefile中找不到包测试

I have following Makefile:

SHELL := /bin/bash

boot:
    @go run main.go

test:
    @go test ./...

test-conf:
    @go test --verbose conf

test-httpd:
    @go test --verbose ./httpd

.PHONY: test test-conf test-httpd

Strangely enough make test works without problems however make test-conf or make test-httpd will both result in "github.com/bodokaiser/foobar [no test files]".

When I run go test ./conf from the working dir it works - shouldn't the makefile work too then?

What do I need to do to get go test working with packages in a Makefile?

PS: I would like to avoid using $(pwd) or something in front of all paths if possible...

test-httpd and test-conf don't work, as you can't use --verbose with go test, only -v.