Nothing

```
context("Basics")
test_that("vertex_ids", {
g1 <- g1()
g2 <- g2()
g3 <- g3()
expect_equal(vertex_ids(g1), letters[1:5])
expect_equal(vertex_ids(g2), letters[1:5])
expect_equal(vertex_ids(g3), character())
})
test_that("vertices", {
g1 <- g1()
g2 <- g2()
g3 <- g3()
expect_equal(
vertices(g1),
data_frame(id = c("a", "b", "c", "d", "e"))
)
expect_equal(
vertices(g2),
data_frame(id = c("a", "b", "c", "d", "e"))
)
expect_equal(
vertices(g3),
data_frame(id = character())
)
})
test_that("edges", {
g1 <- g1()
g2 <- g2()
g3 <- g3()
expect_equal(edges(g1), g1$edges)
expect_equal(edges(g2), g2$edges)
expect_equal(edges(g3), g3$edges)
})
test_that("order and size", {
g1 <- g1()
g2 <- g2()
g3 <- g3()
expect_equal(order(g1), 5)
expect_equal(order(g2), 5)
expect_equal(order(g3), 0)
expect_equal(size(g1), 6)
expect_equal(size(g2), 0)
expect_equal(size(g3), 0)
})
test_that("adjacent vertices", {
g1 <- g1()
g2 <- g2()
g3 <- g3()
expect_equal(
adjacent_vertices(g1),
list(
a = c("b", "e", "b", "e"),
b = c("a", "d", "a"),
c = c("c", "c"),
d = c("b"),
e = c("a", "a")
)
)
expect_equal(
adjacent_vertices(g2),
list(
a = character(), b = character(), c = character(),
d = character(), e = character()
)
)
expect_equal(
adjacent_vertices(g3),
structure(list(), names = character())
)
})
test_that("predecessors and successors", {
G <- graph(list(A = c("B", "C"), B = "C", C = "A"))
expect_equal(
predecessors(G),
list(A = c("C"), B = "A", C = c("A", "B"))
)
expect_equal(
successors(G),
list(A = c("B", "C"), B = "C", C = "A")
)
})
test_that("incident edges", {
G <- graph(list(A = c("B", "C"), B = "C", C = "A"))
expect_equal(
incident_edges(G),
list(
A = data_frame(from = c("A", "A"), to = c("B", "C")),
B = data_frame(from = "B", to ="C"),
C = data_frame(from = "C", to = "A")
)
)
expect_equal(
incident_edges(G, mode = "out"),
list(
A = data_frame(from = c("A", "A"), to = c("B", "C")),
B = data_frame(from = "B", to ="C"),
C = data_frame(from = "C", to = "A")
)
)
expect_equal(
incident_edges(G, mode = "in"),
list(
A = data_frame(from = "C", to = "A"),
B = data_frame(from = "A", to = "B"),
C = data_frame(from = c("A", "B"), to = c("C", "C"))
)
)
expect_equal(
incident_edges(G, mode = "all"),
list(
A = data_frame(from = c("A", "A", "C"), to = c("B", "C", "A")),
B = data_frame(from = c("A", "B"), to = c("B", "C")),
C = data_frame(from = c("A", "B", "C"), to = c("C", "C", "A"))
)
)
})
test_that("degree", {
G <- graph(list(A = c("B", "C"), B = "C", C = "A"))
expect_equal(
degree(G, mode = "out"),
c(A = 2, B = 1, C = 1)
)
expect_equal(
degree(G, mode = "in"),
c(A = 1, B = 1, C = 2)
)
expect_equal(
degree(G, mode = "total"),
c(A = 3, B = 2, C = 3)
)
expect_equal(
degree(G, mode = "all"),
c(A = 3, B = 2, C = 3)
)
})
```

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