Nothing

```
context("Topological sort")
test_that("toplogical sorting works", {
G <- graph(list(
"7" = c("11", "8"),
"5" = "11",
"3" = c("8", "10"),
"11" = c("2", "9", "10"),
"8" = "9",
"2" = character(),
"9" = character(),
"10" = character()
))
topo <- topological_sort(G)
expect_true(match("7", topo) < match("11", topo))
expect_true(match("7", topo) < match("8", topo))
expect_true(match("5", topo) < match("11", topo))
expect_true(match("3", topo) < match("8", topo))
expect_true(match("3", topo) < match("10", topo))
expect_true(match("11", topo) < match("2", topo))
expect_true(match("11", topo) < match("9", topo))
expect_true(match("11", topo) < match("10", topo))
expect_true(match("8", topo) < match("9", topo))
})
test_that("topological sorting works on sparse graphs", {
G <- graph(list(
"a" = "b",
"b" = character(),
"c" = "d",
"d" = character(),
"e" = "f",
"f" = character()
))
topo <-topological_sort(G)
expect_true(match("a", topo) < match("b", topo))
expect_true(match("c", topo) < match("d", topo))
expect_true(match("e", topo) < match("f", topo))
topo2 <- topological_sort(
graph(
list("a" = "b", "b" = "c", "c" = "d", "d" = "e", "e" = character())
)
)
expect_equal(topo2, c("a", "b", "c", "d", "e"))
topo3 <- topological_sort(
graph(list("a" = character(), "b" = character()))
)
expect_equal(sort(topo3), c("a", "b"))
})
```

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