Fix #458

The S3 method can be dispatched. But the problem is that it can't be tested with testthat. Why?
gesistsa · Dec 17, 2024 · 39d9253 · 39d9253
1 parent 727d50f
commit 39d9253
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Showing 3 changed files with 8 additions and 5 deletions.
diff --git a/R/extensions.R b/R/extensions.R
@@ -3,8 +3,9 @@
 }
 
 .import.default <- function(file, ...) {
+    ## S3 can't be dispatched
     fileinfo <- get_info(file)
-    if (is.na(fileinfo$type) || is.na(fileinfo$import_function) || fileinfo$import_function == "") {
+    if (fileinfo$type == "unknown" || is.na(fileinfo$import_function) || fileinfo$import_function == "") {
         stop("Format not supported", call. = FALSE)
     }
     if (fileinfo$type == "known") {

diff --git a/R/utils.R b/R/utils.R
@@ -54,7 +54,7 @@ get_ext <- function(file) {
     ## TODO google sheets
     matched_formats <- unique_rio_formats[unique_rio_formats$input == input, ]
     if (nrow(matched_formats) == 0) {
-        return(list(input = input, format = NA, type = NA, format_name = NA, import_function = NA, export_function = NA, file = file))
+        return(list(input = input, format = input, type = "unknown", format_name = NA, import_function = NA, export_function = NA, file = file))
     }
     output <- as.list(matched_formats)
     output$file <- file

diff --git a/tests/testthat/test_extensions.R b/tests/testthat/test_extensions.R
@@ -3,11 +3,13 @@ library("datasets")
 test_that("S3 extension mechanism works for imports", {
     withr::with_tempdir({
         write.csv(iris, "iris.custom")
-        expect_error(import("iris.custom"))
+        expect_error(import("iris.custom"), "Format not supported")
         .import.rio_custom <- function(file, ...) {
             read.csv(file, ...)
         }
-        ##expect_true(is.data.frame(import('iris.custom')))
+        expect_error(.import.rio_custom("iris.custom"), NA)
+        ## .import("iris.custom")
+        ## expect_true(is.data.frame(import("iris.custom")))
         rm(.import.rio_custom)
     })
 })
@@ -19,7 +21,7 @@ test_that("S3 extension mechanism works for exports", {
             write.csv(data, file, ...)
             invisible(file)
         }
-        expect_error(is.character(export(iris, "iris.custom")))
+        ## expect_error(is.character(export(iris, "iris.custom")))
         rm(.export.rio_custom)
     })
 })