R Under development (unstable) (2025-03-09 r87914 ucrt) -- "Unsuffered Consequences"
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> library(datapackage)
> source("helpers.R")
> 
> fielddescriptor <- list(
+   name = "string",
+   title = "A string field",
+   description = "A description",
+   type = "string"
+ )
> res <- datapackage:::dp_to_string.character(c("a", "b", "", NA), 
+   fielddescriptor = fielddescriptor)
> expect_equal(res, c("a", "b", "", NA), attributes = FALSE)
> expect_attribute(res, "fielddescriptor", fielddescriptor)
> 
> # === Method call
> fielddescriptor <- list(
+   name = "string",
+   title = "A string field",
+   description = "A description",
+   type = "string"
+ )
> res <- dp_to_string(c("a", "b", "", NA), fielddescriptor = fielddescriptor)
> expect_equal(res, c("a", "b", "", NA), attributes = FALSE)
> expect_attribute(res, "fielddescriptor", fielddescriptor)
> 
> # === No Schema
> fielddescriptor <- list(
+   type = "string"
+ )
> res <- dp_to_string(c("a", "b", "", NA), fielddescriptor = fielddescriptor)
> expect_equal(res, c("a", "b", "", NA), attributes = FALSE)
> expect_attribute(res, "fielddescriptor", fielddescriptor)
> 
> # === Empty input
> res <- dp_to_string(character(0))
> expect_equal(res, character(0), attributes = FALSE)
> 
> # === NA
> fielddescriptor <- list(
+   type = "string",
+   missingValues = c("NA", "<NA>")
+ )
> res <- dp_to_string(c("a", "NA", "<NA>", NA), fielddescriptor)
> expect_equal(res, c("a", NA, NA, NA), attributes = FALSE)
> 
> # =============================================================================
> # csv_colclass
> 
> #res <- csv_colclass_string(list()) 
> #expect_equal(res, "character")
> #
> ## === NA
> #fielddescriptor <- list(
> #  type = "string",
> #  missingValues = c("NA", "<NA>")
> #)
> #res <- csv_colclass_string(fielddescriptor)
> #expect_equal(res, "character")
> 
> 
> proc.time()
   user  system elapsed 
   0.10    0.07    0.18