context("new mean")
test_that("new updated mean is", {
expect_equal(new_mean(5, 7, 4), 5.5)
expect_equal(new_mean(10, 2, 100), 9.92)
expect_equal(new_mean(9, 4, 5), 8)
expect_error(new_mean(5, 4, "c"))
})
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