tests/testthat/test-approximation.R

In rlemon: R Access to LEMON Graph Algorithms

# Title            : Approximation
# File             : R/approximation.R
# Exported         : MaxClique
# Valid Algorithms : "GrossoLocatelliPullanMc" (default)
# Runners          : GrossoLocatelliPullanMcRunner

# 1) Ensure runner functions run without error and return the "expected
# objects".
test_that("Approximation runner", {
  s <- c(1, 2, 3, 4, 5)
  t <- c(2, 3, 1, 5, 4)
  n <- 5
  out <- GrossoLocatelliPullanMcRunner(s, t, n)
  expect_true(is.list(out))
  expect_length(out, 2)
  expect_length(out[[1]], 1)
  expect_true(all(out[[2]] %in% s))
})

test_that("Approximation functions", {
  s <- c(1, 2, 3, 4, 5)
  t <- c(2, 3, 1, 5, 4)
  n <- 5

  # 2) Ensure exported functions run without error and return the "expected
  # objects".
  out <- MaxClique(s, t, n)
  expect_true(is.list(out))
  expect_length(out, 2)
  expect_length(out[[1]], 1)
  expect_true(all(out[[2]] %in% s))
  expect_named(out, c("size", "members"))

  # 3) Ensure exported functions with `algorithm=`default runs without error, and
  # returns the same if passed no argument
  out2 <- MaxClique(s, t, n, algorithm = "GrossoLocatelliPullanMc")
  expect_identical(out, out2)

  # 4) Ensure exported functions work with all valid algorithms.
  # No alternate algorithsm

  # 5) Ensure exported functions fail if passed an invalid algorithm.
  expect_error(MaxClique(s, t, n, algorithm = "abc"),
               "Invalid")
  expect_error(MaxClique(s, t, n, algorithm = 1),
               "must be a string")
  expect_error(MaxClique(s, t, n, algorithm = NULL),
               "must be a string")
})