test_that("map_values", {
x = letters[1:5]
old = c("b", "d", "z")
new = c("x", "y", "1")
expect_equal(map_values(x, old, new), c("a", "x", "c", "y", "e"))
old = "m"
new = "n"
expect_equal(map_values(x, old, new), x)
old = c("a", "b")
new = "z"
expect_equal(map_values(x, old, new), c("z", "z", "c", "d", "e"))
})
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