tests/testthat/test-geom_dag.R

In ggdag: Analyze and Create Elegant Directed Acyclic Graphs

set.seed(1234)

test_that("repelled labels work", {
  g <- dagify(m ~ x + y,
    y ~ x,
    exposure = "x",
    outcome = "y",
    latent = "m",
    labels = c("x" = "Exposure", "y" = "Outcome", "m" = "Collider")
  )

  p1 <- g %>%
    tidy_dagitty() %>%
    ggplot(aes(x = x, y = y, xend = xend, yend = yend)) +
    geom_dag_edges() +
    geom_dag_point() +
    geom_dag_text_repel(aes(label = name), show.legend = FALSE)

  p2 <- g %>%
    tidy_dagitty() %>%
    dag_label(labels = c(
      "x" = "This is the exposure",
      "y" = "Here's the outcome",
      "m" = "Here is where they collide"
    )) %>%
    ggplot(aes(x = x, y = y, xend = xend, yend = yend)) +
    geom_dag_edges() +
    geom_dag_point() +
    geom_dag_text() +
    geom_dag_label_repel(aes(label = label, fill = label),
      col = "white", show.legend = FALSE
    )


  expect_doppelganger("geom_dag_text_repel() repels names", p1)
  expect_doppelganger("geom_dag_label_repel() repels labels", p2)
})

test_that("different edge types work", {
  p <- dagify(
    y ~ x + z2 + w2 + w1,
    x ~ z1 + w1,
    z1 ~ w1 + v,
    z2 ~ w2 + v,
    L ~ w1 + w2
  ) %>%
    ggplot(aes(x = x, y = y, xend = xend, yend = yend)) +
    geom_dag_point() +
    geom_dag_text()

  expect_doppelganger("geom_dag_edges_link() is straight", p + geom_dag_edges_link())
  expect_doppelganger("geom_dag_edges_arc() is arcy", p + geom_dag_edges_arc())
  expect_doppelganger("geom_dag_edges_diagonal() is arcy", p + geom_dag_edges_diagonal())
  expect_doppelganger("geom_dag_edges_fan() is fany", p + geom_dag_edges_fan())
})
test_that("labels also work", {
  g <- dagify(m ~ x + y,
              y ~ x,
              exposure = "x",
              outcome = "y",
              latent = "m",
              labels = c("x" = "Exposure", "y" = "Outcome", "m" = "Collider")
  )

  p1 <- g %>%
    tidy_dagitty() %>%
    ggplot(aes(x = x, y = y, xend = xend, yend = yend)) +
    geom_dag_edges() +
    geom_dag_point() +
    geom_dag_label(aes(label = label))

  expect_doppelganger("geom_dag_label() labels", p1)
})