[short] skip

! go test -x coverbad
! stderr '[\\/]coverbad\.test( |$)' # 'go test' should not claim to have run the test.
stderr 'undefined: g'
stderr 'undefined: j'

-- go.mod --
module coverbad

go 1.16
-- p.go --
package p

func f() {
	g()
}
-- p1.go --
package p

import "C"

func h() {
	j()
}
-- p_test.go --
package p

import "testing"

func Test(t *testing.T) {}