dragosmg commented on a change in pull request #12486:
URL: https://github.com/apache/arrow/pull/12486#discussion_r812423235
##########
File path: r/tests/testthat/test-duckdb.R
##########
@@ -15,6 +15,19 @@
# specific language governing permissions and limitations
# under the License.
+test_that("meaningful error message when duckdb is not installed", {
+ new_lib <- tempfile()
+ dir.create(new_lib)
+ withr::with_libpaths(new_lib, {
+ ds <- InMemoryDataset$create(example_data)
+ expect_error(
+ to_duckdb(ds),
+ "Please install the `duckdb` package."
+ )
+ })
+ unlink(new_lib, recursive = TRUE)
Review comment:
`new_lib` works correctly and gets inserted at the first position of
`.libPaths()`.
``` r
new_lib <- tempfile()
dir.create(new_lib)
withr::with_libpaths(new_lib, {
.libPaths()
})
#> [1]
"/private/var/folders/wx/zjw1jzk11s76vchhc2xym7xw0000gn/T/RtmpHwjdcB/file1ed63169505e"
#> [2] "/Library/Frameworks/R.framework/Versions/4.1/Resources/library"
unlink(new_lib, recursive = TRUE)
```
<sup>Created on 2022-02-22 by the [reprex
package](https://reprex.tidyverse.org) (v2.0.1)</sup>
I think the issue is that the system library will always be at
`.libPaths()[[2]]`, which means the code above should work provided you have
_not_ installed packages in the system library.
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