tests/testthat/test-classes.R

In checkr: Check the Properties of Common R Objects

context("classes")

test_that("check_classes", {
  x <- list()
  class(x) <- c("a", "b")
  
  expect_identical(check_classes(x, "a"), x)
  expect_identical(check_classes(x, "b"), x)
  expect_error(check_classes(x, "c"), "x must inherit from class c")
  expect_identical(check_classes(x, c("a", "b")), x)
  expect_identical(check_classes(x, c("b", "a")), x)
  expect_identical(check_classes(x, c("a", "b"), exclusive = TRUE), x)
  expect_identical(check_classes(x, c("b", "a"), exclusive = TRUE), x)
  expect_identical(check_classes(x, c("a", "b"), order = TRUE), x)
  expect_error(check_classes(x, c("b", "a"), order = TRUE), "x classes must include 'b' and 'a' in that order")
  expect_identical(check_classes(x, c("a", "b"), exclusive = TRUE, order = TRUE), x)
  expect_error(check_classes(x, c("b", "a"), exclusive = TRUE, order = TRUE), "x classes must be identical to 'b' and 'a'")
})

test_that("check_classes", {
  x <- list()
  class(x) <- c("a", "b", "c")
  
  expect_identical(check_classes(x, "a"), x)
  expect_identical(check_classes(x, c("a", "b")), x)
  expect_identical(check_classes(x, c("b", "a")), x)
  expect_error(check_classes(x, c("a", "b"), exclusive = TRUE), "x classes must include and only include 'a' and 'b'")
  expect_error(check_classes(x, c("b", "a"), exclusive = TRUE), "x classes must include and only include 'b' and 'a'")
  expect_identical(check_classes(x, c("a", "b"), order = TRUE), x)
  expect_error(check_classes(x, c("b", "a"), order = TRUE), "x classes must include 'b' and 'a' in that order")
  expect_error(check_classes(x, c("a", "b"), exclusive = TRUE, order = TRUE), "x classes must be identical to 'a' and 'b'")
  expect_error(check_classes(x, c("b", "a"), exclusive = TRUE, order = TRUE), "x classes must be identical to 'b' and 'a'")
})