test: improve add_vertices() tests

tests/testthat/test-add.vertices.R

@@ -1,19 +1,20 @@
 test_that("add_vertices works", {
   g <- graph_from_literal(A - B - C - D - E)
-  g2 <- add_vertices(g, (nv <- 4))
-  expect_that(vcount(g2), equals(vcount(g) + nv))
-  expect_that(ecount(g2), equals(ecount(g)))
-  expect_that(as_edgelist(g2), equals(as_edgelist(g)))
+  nv <- 4
+  g2 <- add_vertices(g, nv = nv)
+
+  expect_equal(vcount(g2), vcount(g) + nv)
+  expect_equal(ecount(g2), ecount(g))
+  expect_equal(as_edgelist(g2), as_edgelist(g))
 })
 
 test_that("add_vertices handles attributes properly", {
   g <- graph_from_literal(A - B - C - D - E)
-  g3 <- add_vertices(g, (nv <- 3),
-    attr = list(
-      name = (names <- c("F", "G", "H")),
-      weight = weights <- 1:3
-    )
-  )
-  expect_that(V(g3)$name, equals(c(V(g)$name, names)))
-  expect_that(V(g3)$weight, equals(c(rep(NA, vcount(g)), weights)))
+  nv <- 3
+  names <- c("F", "G", "H")
+  weights <- 1:3
+  g3 <- add_vertices(g, nv = nv, attr = list(name = names, weight = weights))
+
+  expect_equal(V(g3)$name, c(V(g)$name, names))
+  expect_equal(V(g3)$weight, c(rep(NA, vcount(g)), weights))
 })