Nothing

```
context("test-define_model_set")
test_that("classes are correct (list and DAG)", {
ml <- define_model_set(x = c(A ~ B), .common = c(C ~ D))
expect_equal(length(ml), 1)
expect_equal(class(ml), 'list')
expect_true(inherits(ml[[1]], 'DAG'))
})
test_that("Dimensions of all model matrices is the same.", {
#Simple two models
expect_equal(unique(sapply(
define_model_set(c(A~B, B~C), c(A~C, B~C)), nrow)), 3)
#Two models with non-overlapping nodes
expect_equal(unique(sapply(
define_model_set(c(A~B, B~C), c(A~C, C~D)), nrow)), 4)
#Use of the .common
expect_equal(unique(sapply(
define_model_set(A~B, A~C, .common = C~D), nrow)), 4)
#Use of isolate
expect_equal(unique(sapply(
define_model_set(A~B, c(A~B, C~C)), nrow)), 3)
#Use of isolate in .common
expect_equal(unique(sapply(
define_model_set(A~B, A~B, .common = C~C), nrow)), 3)
})
```

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