gmm_1 <- list(alpha = 1, mu = matrix(0, dimnames = list("A", NULL)),
              sigma = list(matrix(1, dimnames = list("A", "A"))))
class(gmm_1) <- "gmm"
gmm_2 <- list(alpha = 1, mu = matrix(0, 2, dimnames = list(c("B", "A"), NULL)),
              sigma = list(matrix(c(1, 0, 0, 1), 2,
                                  dimnames = list(c("B", "A"), c("B", "A")))))
class(gmm_2) <- "gmm"
gmm_3 <- list(alpha = 1, mu = matrix(0, dimnames = list("B", NULL)),
              sigma = list(matrix(1, dimnames = list("B", "B"))))
class(gmm_3) <- "gmm"
gmm_4 <- list(alpha = 1, mu = matrix(0, 2, dimnames = list(c("C", "B"), NULL)),
              sigma = list(matrix(c(1, 0, 0, 1), 2,
                                  dimnames = list(c("C", "B"), c("C", "B")))))
class(gmm_4) <- "gmm"

gmbn_1 <- list(A = gmm_1, B = gmm_2)
class(gmbn_1) <- "gmbn"
gmbn_2 <- list(B = gmm_3, C = gmm_4)
class(gmbn_2) <- "gmbn"
gmbn_3 <- list(A = gmm_1)
class(gmbn_3) <- "gmbn"
gmbn_4 <- list(B = gmm_3)
class(gmbn_4) <- "gmbn"

gmdbn_1 <- list(b_1 = gmbn_3, b_2 = gmbn_3)
class(gmdbn_1) <- "gmdbn"
gmdbn_2 <- list(b_1 = gmbn_4, b_2 = gmbn_4)
class(gmdbn_2) <- "gmdbn"

test_that("rename nodes of a gmbn object", {
  expect_equal(rename_nodes(gmbn_1, c("A", "B"), c("B", "C")), gmbn_2)
})

test_that("rename no node of a gmbn object", {
  expect_equal(rename_nodes(gmbn_3, NULL, NULL), gmbn_3)
  expect_equal(rename_nodes(gmbn_3, character(), character()), gmbn_3)
})

test_that("rename nodes of a gmdbn object", {
  expect_equal(rename_nodes(gmdbn_1, "A", "B"), gmdbn_2)
})