test_that(".assignParentValue works", {
  expect_equal(.assignParentValue("generation"), .5)
  expect_equal(.assignParentValue("additive"), .5)
  expect_equal(.assignParentValue("common nuclear"), 1)
  expect_equal(.assignParentValue("mitochondrial"), 1)
  expect_equal(.assignParentValue("mtdna"), 1)
  expect_equal(.assignParentValue("mitochondria"), 1)

  expect_error(
    .assignParentValue("unknown component"),
    "Don't know how to set parental value"
  )
})