Nothing
test_that("input_to_matrix works", {
# vector to matrix
expect_true(is.matrix(input_to_matrix(rnorm(n = 100))))
# data.frame to matrix
data("single_trial_binocular")
expect_true(is.matrix(input_to_matrix( single_trial_binocular[, c("xL", "xR")])))
})
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