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https://issues.apache.org/jira/browse/ARROW-14458?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dragoș Moldovan-Grünfeld closed ARROW-14458.
--------------------------------------------
Resolution: Later
> [R] Use expect_snapshot() to improve tests
> ------------------------------------------
>
> Key: ARROW-14458
> URL: https://issues.apache.org/jira/browse/ARROW-14458
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Reporter: Dragoș Moldovan-Grünfeld
> Assignee: Dragoș Moldovan-Grünfeld
> Priority: Major
> Labels: pull-request-available
> Fix For: 9.0.0
>
> Time Spent: 8h 10m
> Remaining Estimate: 0h
>
> Update (2022, January 20):
> [Hadley's
> suggestion|https://github.com/r-lib/testthat/issues/1471#issuecomment-1005372257]
> would be to move away from the
> {code:r}
> expect_snapshot({
> (expect_error())
> })
> {code}
> pattern and use one of 3 options:
>
> * If you want to inspect the error message, use {{{}expect_snapshot(error =
> TRUE){}}}.
> * If you want to check the class, use {{expect_error(class = )}}
> * If you want to expect the message and check the class, use
> {{{}expect_snapshot_error(class = ){}}}.
> I have being using option 1 and it seems to do most of what we want. For
> example, see the [left_join by arg
> PR|https://github.com/apache/arrow/pull/12179].
> ==============
> This comes from [Romain's
> suggestion|https://github.com/apache/arrow/pull/11502/files/2a8a139b727acb13019da6176444578ead6bf208#r735351673]
> to transform the test that rely on capturing a string by using a snapshot
> test (added in {{{}testthat{}}}'s 3rd edition).
> A test like:
> {code:r}
> expect_error(expression, message)
> {code}
> becomes
> {code:r}
> expect_snapshot({
> (expect_error(expression))
> })
> {code}
> This is probably a more general improvement we can make to our unit tests
> (i.e. to make more extensive use of the snapshot functionality), but I
> thought I'd focus on one test file to begin with.
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