test_that("data frame outout", {
df <- region_min_max("USA")
expect_s3_class(df, "data.frame")
expect_true("region_name" %in% colnames(df))
expect_true("dimension" %in% colnames(df))
expect_true("drainage_area" %in% colnames(df))
expect_true("value" %in% colnames(df))
})
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