test_that("returns double", {
vector <- c("a", "b", "a", "a")
contrasts <- build_contrast(vector, "a", "b")
expect_type(contrasts, "double")
})
test_that("returns two codes only", {
vector <- c("a", "b", "a", "a")
contrasts <- build_contrast(vector, "a", "b")
expect_length(unique(contrasts), 2L)
})
test_that("does not throw an error", {
vector <- c("a", "b", "a", "a")
expect_silent(build_contrast(vector, "a", "b"))
})
test_that("default method does not throw an error", {
vector <- c(1, 1, 2)
expect_silent(build_contrast(vector, "1", "2"))
})
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