test_that("check_number errors", {
y <- 2
expect_identical(check_number(y), y)
y <- 2L
expect_error(check_number(y), "y must be of class 'numeric'")
y <- 1:2
expect_error(check_number(y), "y must be a scalar")
y <- NULL
expect_error(check_number(y), "y must be a scalar")
expect_identical(check_number(-1), -1)
})
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