Update tests to use best practices

[kevmoo]

No description provided.

[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:args	2.8.0	ready to publish	args-v2.8.0
package:async	2.13.1-wip	WIP (no publish necessary)
package:characters	1.4.1	already published at pub.dev
package:collection	1.20.0-wip	WIP (no publish necessary)
package:convert	3.1.3-wip	WIP (no publish necessary)
package:crypto	3.0.7	already published at pub.dev
package:fixnum	1.2.0-wip	WIP (no publish necessary)
package:lints	6.1.0	already published at pub.dev
package:logging	1.3.1-wip	WIP (no publish necessary)
package:os_detect	2.0.4-wip	WIP (no publish necessary)
package:path	1.9.2-wip	WIP (no publish necessary)
package:platform	3.1.7-wip	WIP (no publish necessary)
package:typed_data	1.4.1-wip	WIP (no publish necessary)

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.

[github-actions]

PR Health

License Headers ✔️

// Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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no missing headers

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pkgs/collection/benchmark/legacy_quicksort.dart

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API leaks ✔️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

Package	Leaked API symbol	Leaking sources

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Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
characters	None	1.4.1	1.4.1	1.4.1	✔️
collection	Breaking	1.19.1	1.20.0-wip	1.20.0-wip	✔️
crypto	None	3.0.7	3.0.7	3.0.7	✔️
logging	None	1.3.0	1.3.1-wip	1.3.1-wip	✔️
typed_data	None	1.4.0	1.4.1-wip	1.4.1-wip	✔️

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Unused Dependencies ⚠️

Package	Status
characters	✔️ All dependencies utilized correctly.
collection	✔️ All dependencies utilized correctly.
crypto	❗ Show Issues These packages may be unused, or you may be using assets from these packages: * typed_data
logging	✔️ All dependencies utilized correctly.
typed_data	✔️ All dependencies utilized correctly.

For details on how to fix these, see dependency_validator.

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Changelog Entry ✔️

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[natebosch]

Can you update the first comment with the planned content for the commit message? We should describe the code changes and how they were produced.