test_that("input validation works", {
list <- list("a")
char <- c("b")
num <- c(1)
expect_output(conspire(list, char, list), "a b a")
expect_output(conspire(char, list, char), "b a b")
expect_error(conspire(num, char, char))
expect_error(conspire(char, num, char))
expect_error(conspire(char, char, num))
})
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