Check data race in test

[bep]

Read at 0x00c000b29500 by goroutine 148:
  runtime.slicecopy()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/runtime/slice.go:197 +0x0
  github.com/gohugoio/hugo/hugolib.(*pagesMapBucket).getPagesAndSections.func1()
      /Users/travis/src/hugo/hugolib/pages_map.go:437 +0xcb
  sync.(*Once).Do()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/sync/once.go:44 +0xde
  github.com/gohugoio/hugo/hugolib.(*pagesMapBucket).getPagesAndSections()
      /Users/travis/src/hugo/hugolib/pages_map.go:435 +0x65
  github.com/gohugoio/hugo/hugolib.(*pageState).Pages.func1()
      /Users/travis/src/hugo/hugolib/page.go:139 +0x1fd
  sync.(*Once).Do()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/sync/once.go:44 +0xde
  github.com/gohugoio/hugo/hugolib.(*pageState).Pages()
      /Users/travis/src/hugo/hugolib/page.go:170 +0xa1
  runtime.call32()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/runtime/asm_amd64.s:519 +0x3a
  reflect.Value.Call()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/reflect/value.go:308 +0xc0
  text/template.safeCall()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/text/template/funcs.go:293 +0xdd
  text/template.(*state).evalCall()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/text/template/exec.go:703 +0x6e0
  text/template.(*state).evalField()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/text/template/exec.go:593 +0xf38
  text/template.(*state).evalFieldChain()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/text/template/exec.go:554 +0x2fb
  text/template.(*state).evalFieldNode()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/text/template/exec.go:518 +0x161
  text/template.(*state).evalCommand()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/text/template/exec.go:456 +0xcb1
  text/template.(*state).evalPipeline()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/text/template/exec.go:430 +0x1ff
  text/template.(*state).walk()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/text/template/exec.go:254 +0x69c
  text/template.(*state).walk()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/text/template/exec.go:262 +0x1a0
  text/template.(*Template).execute()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/text/template/exec.go:217 +0x2f8
  html/template.(*Template).Execute()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/text/template/exec.go:200 +0xd3
  github.com/gohugoio/hugo/tpl.(*TemplateAdapter).Execute()
      /Users/travis/src/hugo/tpl/template.go:163 +0xf8
  github.com/gohugoio/hugo/hugolib.(*Site).renderForLayouts()
      /Users/travis/src/hugo/hugolib/site.go:1597 +0xc8
  github.com/gohugoio/hugo/hugolib.(*Site).renderAndWritePage()
      /Users/travis/src/hugo/hugolib/site.go:1513 +0x297
  github.com/gohugoio/hugo/hugolib.pageRenderer()
      /Users/travis/src/hugo/hugolib/site_render.go:152 +0x8ed
Previous write at 0x00c000b29500 by goroutine 74:
  [failed to restore the stack]
Goroutine 148 (running) created at:
  github.com/gohugoio/hugo/hugolib.(*Site).renderPages()
      /Users/travis/src/hugo/hugolib/site_render.go:73 +0x199
  github.com/gohugoio/hugo/hugolib.(*Site).render()
      /Users/travis/src/hugo/hugolib/site.go:1095 +0x8b
  github.com/gohugoio/hugo/hugolib.(*HugoSites).render()
      /Users/travis/src/hugo/hugolib/hugo_sites_build.go:337 +0x9f0
  github.com/gohugoio/hugo/hugolib.(*HugoSites).Build.func4()
      /Users/travis/src/hugo/hugolib/hugo_sites_build.go:134 +0x57
  runtime/trace.WithRegion()
      /Users/travis/.gimme/versions/go1.12.10.darwin.amd64/src/runtime/trace/annotation.go:137 +0x10b
  github.com/gohugoio/hugo/hugolib.(*HugoSites).Build()
      /Users/travis/src/hugo/hugolib/hugo_sites_build.go:136 +0xa77
  github.com/gohugoio/hugo/hugolib.(*sitesBuilder).build()
      /Users/travis/src/hugo/hugolib/testhelpers_test.go:551 +0x1fa
  github.com/gohugoio/hugo/hugolib.(*sitesBuilder).Build()
      /Users/travis/src/hugo/hugolib/testhelpers_test.go:516 +0xe8
  github.com/gohugoio/hugo/hugolib.TestSmoke()
      /Users/travis/src/hugo/hugolib/hugo_smoke_test.go:174 +0x14b8
  testing.tRunner()
      /Users/travis/.gimme/v

[github-actions]

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