context("infix operators")
test_that("infix operators work", {
library(igraph)
g <- make_ring(10)
V(g)$name <- letters[1:10]
E(g)$name <- LETTERS[1:10]
g <- g - c("a", "b")
expect_that(vcount(g), equals(8))
expect_that(ecount(g), equals(7))
expect_true(graph.isomorphic(g, make_lattice(8)))
g <- g - edge("e|f")
expect_true(graph.isomorphic(g, make_lattice(5) + make_lattice(3)))
g <- g - edge("H")
expect_true(graph.isomorphic(g, graph_from_literal(a-b-c, d-e-f, g-h)))
g <- make_ring(10)
V(g)$name <- letters[1:10]
g <- g - path("a", "b")
expect_true(graph.isomorphic(g, graph_from_literal(a, b-c-d-e-f-g-h-i-j-a)))
g <- g + path("a", "b")
expect_true(graph.isomorphic(g, make_ring(10)))
g <- make_ring(10)
V(g)$name <- letters[1:10]
g <- g - path("a", "b", "c", "d")
expect_true(graph.isomorphic(g, make_lattice(8) + 2))
expect_true(graph.isomorphic(g - V(g)[c('d', 'g')],
make_lattice(4) + make_lattice(2) + 2))
expect_true(graph.isomorphic(g - E(g)['f' %--% 'g'],
make_lattice(5) + make_lattice(3) + 2))
})
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