set.seed(1234)
test_that("DAG paths are identified and drawn correctly", {
coords_confounder <- tibble::tribble(
~name,
~x,
~y,
"x",
0,
0,
"y",
2,
0,
"z",
1,
1
)
confounder_triangle_dag <- dagify(
x ~ z,
y ~ x + z,
exposure = "x",
outcome = "y",
coords = coords_confounder
)
coords_butterfly <- tibble::tribble(
~name,
~x,
~y,
"x",
0,
0,
"y",
2,
0,
"a",
0,
1,
"b",
2,
1,
"m",
1,
.5
)
butterfly_bias_dag <- dagify(
m ~ a + b,
x ~ a + m,
y ~ b + x + m,
exposure = "x",
outcome = "y",
coords = coords_butterfly
)
p1 <- confounder_triangle_dag %>%
ggdag_paths(from = "x", to = "y")
p2 <- butterfly_bias_dag %>%
ggdag_paths_fan()
p3 <- confounder_triangle_dag %>%
ggdag_paths(from = "x", to = "y", shadow = FALSE)
p4 <- butterfly_bias_dag %>%
ggdag_paths_fan(shadow = FALSE)
expect_doppelganger("ggdag_paths() draws 2 open paths", p1)
expect_doppelganger("ggdag_paths_fan() draws 4 open paths", p2)
expect_doppelganger("ggdag_paths() draws 2 open paths without shadows", p3)
expect_doppelganger("ggdag_paths_fan() draws 4 open paths without shadows", p4)
})
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