test_that("safely has NULL error when successful", {
out <- safely(log10)(10)
expect_equal(out, list(result = 1, error = NULL))
})
test_that("safely has NULL result on failure", {
out <- safely(log10)("a")
expect_equal(out$result, NULL)
expect_equal(out$error$message,
"non-numeric argument to mathematical function")
})
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