Nothing
test_that("strs_find works", {
expect_equal(strs_find("words", "r"), 3)
expect_equal(strs_find(c("words", "groovy"), "r"), c(3, 2))
expect_equal(strs_find(c("words", "groovy", "z"), "r"), c(3, 2, NA_integer_))
})
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