fixture_env
PREF_FOO=fooooo
PREF_BAR_BAZ=2
PREF_QUUUX=false
PREF_QUXMAP_KEY1_QUUUX=true
PREF_QUUUX_PTR_UNSET_VALUE=testptr3
PREF_TAG_TEST=imTheValueByCustomTag
PREF_TAGVALUEWITHOMITEMPTY=imTheValueWithOmitempty
PREF_TAG_CUSTOM_NAME=imTheValueWithCustomName
PREF_TAGVALUEWITHDASH=imTheValueWithDash