tests/testthat/test-bishop_left.R

In chessboard: Create Network Connections Based on Chess Moves

# Data for tests ----

sites <- expand.grid("transect" = 1:5, 
                     "quadrat"  = 1:5)

nodes <- create_node_labels(data     = sites, 
                             transect = "transect", 
                             quadrat  = "quadrat")

sites_qu <- expand.grid("transect" = 3, 
                        "quadrat"  = 1:5)

nodes_qu <- create_node_labels(data     = sites_qu, 
                                transect = "transect", 
                                quadrat  = "quadrat")

sites_tr <- expand.grid("transect" = 1:5, 
                        "quadrat"  = 3)

nodes_tr <- create_node_labels(data     = sites_tr, 
                                transect = "transect", 
                                quadrat  = "quadrat")

# Tests for errors ----

test_that("bishop_left() - Tests for errors", {
  
  expect_error(bishop_left(),
               paste0("Argument 'nodes' is required (output of the function ", 
                      "create_node_labels())"),
               fixed = TRUE)
  
  expect_error(bishop_left(nodes_qu),
               paste0("The bishop left movement is not designed to work ", 
                      "through quadrats only. Please use pawn() instead."),
               fixed = TRUE)
  
  expect_error(bishop_left(nodes_tr),
               paste0("The bishop left movement is not designed to work ", 
                      "through transects only. Please use fool() instead."),
               fixed = TRUE)
})


# Tests for success ----

test_that("bishop_left() - Tests for success (2D network)", {
  
  expect_silent({
    neighbors <- bishop_left(nodes,
                             focus    = "3-3",
                             degree   = 1,
                             directed = TRUE,
                             reverse  = FALSE, 
                             self     = FALSE)
  })
  
  expect_equal(class(neighbors), "data.frame")
  expect_equal(ncol(neighbors), 4L)
  expect_equal(nrow(neighbors), 1L)
  expect_equal(neighbors[ , "node"], c("2-4"))
  
  
  expect_silent({
    neighbors <- bishop_left(nodes,
                             focus    = "3-3",
                             degree   = 2,
                             directed = TRUE,
                             reverse  = FALSE, 
                             self     = FALSE)
  })
  
  expect_equal(class(neighbors), "data.frame")
  expect_equal(ncol(neighbors), 4L)
  expect_equal(nrow(neighbors), 2L)
  expect_equal(neighbors[ , "node"], c("1-5", "2-4"))
  
  
  expect_silent({
    neighbors <- bishop_left(nodes,
                             focus    = "3-3",
                             degree   = 1,
                             directed = TRUE,
                             reverse  = TRUE, 
                             self     = FALSE)
  })
  
  expect_equal(class(neighbors), "data.frame")
  expect_equal(ncol(neighbors), 4L)
  expect_equal(nrow(neighbors), 1L)
  expect_equal(neighbors[ , "node"], c("4-2"))
  
  
  expect_silent({
    neighbors <- bishop_left(nodes,
                             focus    = "3-3",
                             degree   = 1,
                             directed = FALSE,
                             reverse  = FALSE, 
                             self     = FALSE)
  })
  
  expect_equal(class(neighbors), "data.frame")
  expect_equal(ncol(neighbors), 4L)
  expect_equal(nrow(neighbors), 2L)
  expect_equal(neighbors[ , "node"], c("2-4", "4-2"))
  
  
  expect_silent({
    neighbors <- bishop_left(nodes,
                             focus    = "3-3",
                             degree   = 1,
                             directed = FALSE,
                             reverse  = FALSE, 
                             self     = TRUE)
  })
  
  expect_equal(class(neighbors), "data.frame")
  expect_equal(ncol(neighbors), 4L)
  expect_equal(nrow(neighbors), 3L)
  expect_equal(neighbors[ , "node"], c("2-4", "3-3", "4-2"))
})