Nothing

```
context("test-dag")
library(phylopath)
test_that("DAGs get the correct classes", {
expect_true(inherits(DAG(A~B, B~C), 'matrix'))
expect_true(inherits(DAG(A~B, B~C), 'DAG'))
})
test_that('DAGs make correct nr of rows and columns', {
expect_equal(nrow(DAG(A~B, B~C, C~D)), 4)
expect_equal(nrow(DAG(A~B, B~C, C~D)), ncol(DAG(A~B, B~C, C~D)))
})
test_that('Correct ordering of DAGs', {
expect_equal(
unclass(DAG(A~B, B~C, C~D)),
structure(
c(0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0),
.Dim = c(4L, 4L),
.Dimnames = list(c("D", "C", "B", "A"), c("D", "C", "B", "A"))
)
)
expect_equal(
unclass(DAG(A~B, C~D, B~C, order = FALSE)),
structure(
c(0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0),
.Dim = c(4L, 4L), .Dimnames = list(c("A", "B", "C", "D"), c("A", "B", "C", "D"))
)
)
})
```

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