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https://issues.apache.org/jira/browse/ARROW-11752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17314052#comment-17314052
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Jonathan Keane commented on ARROW-11752:
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Many (though not all!) of our uses are testing our own R6 class objects which
isn't totally obvious how to test.
https://github.com/r-lib/testthat/issues/1271 suggests using
{{expect_s3_class(object, "R6classname")}} We could (and probably should to
match the accepted wisdom?) do that. We could also write our own helper
something like {{expect_r6_class}} that uses {{expect_s3_class}} and then also
checks that the object is _also_ an R6 object.
> [R] Replace usage of testthat::expect_is()
> ------------------------------------------
>
> Key: ARROW-11752
> URL: https://issues.apache.org/jira/browse/ARROW-11752
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Reporter: Neal Richardson
> Priority: Minor
> Fix For: 5.0.0
>
>
> Per https://testthat.r-lib.org/reference/expect_is.html it has been
> superceded. We have ~180 instances of it in our tests that should be upgraded.
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