tree 0be833ff476845309ae5fb6dd85f6e87db478fb1
parent b9f2f1e39b1656c081991e81f2b368262a1086db
author hellohuanlin <41930132+hellohuanlin@users.noreply.github.com> 1683123601 -0700
committer GitHub <noreply@github.com> 1683123601 +0000
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[pigeon]enable treat warning as errors for swift code in unit test (#3889)

This will make it easier to spot issues where we accidentally create an "implicit optional". For more details about why implicit optional is bad, see https://github.com/flutter/packages/pull/3658

For example, the following warning was ignored previously: 

![Screenshot 2023-04-06 at 4 15 07 PM](https://user-images.githubusercontent.com/41930132/235790274-776f096a-212c-445b-ae81-f748b143f982.png)

*List which issues are fixed by this PR. You must list at least one issue.*

Mentioned in PR: https://github.com/flutter/packages/pull/3658#discussion_r1179895310

*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*