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Improve JsonAdapter documentation and tests #2442

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Marcono1234
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@Marcono1234 Marcono1234 commented Jul 21, 2023

Purpose

Improve @JsonAdapter documentation and tests, especially regarding:

  • how @JsonAdapter creates instances
  • effect of JsonAdapter.nullSafe

Checklist

  • New code follows the Google Java Style Guide
  • If necessary, new public API validates arguments, for example rejects null
  • New public API has Javadoc
    • Javadoc uses @since $next-version$
      ($next-version$ is a special placeholder which is automatically replaced during release)
  • If necessary, new unit tests have been added
    • Assertions in unit tests use Truth, see existing tests
    • No JUnit 3 features are used (such as extending class TestCase)
    • If this pull request fixes a bug, a new test was added for a situation which failed previously and is now fixed
  • mvn clean verify javadoc:jar passes without errors

Existing test `JsonAdapterNullSafeTest` had misleading comments; while it
did in the end detect if null had not been handled correctly, that only
worked because the field `JsonAdapterFactory.recursiveCall` is static and
one test method therefore affected the state of the other test method.
If the test methods were run separately in different test runs, they would
not have detected if null was handled correctly, because the factory would
not have returned null.
@Marcono1234 Marcono1234 force-pushed the marcono1234/JsonAdapter-doc-adapter-creation branch from 541d138 to e0ebdfa Compare August 23, 2023 13:09
@Marcono1234 Marcono1234 changed the title Document how JsonAdapter creates adapter instances & add tests Improve JsonAdapter documentation and tests Aug 23, 2023
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@eamonnmcmanus eamonnmcmanus left a comment

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Looks good. Thanks!

@eamonnmcmanus eamonnmcmanus merged commit 88fd6d1 into google:main Aug 23, 2023
9 checks passed
@Marcono1234 Marcono1234 deleted the marcono1234/JsonAdapter-doc-adapter-creation branch August 24, 2023 17:47
tibor-universe pushed a commit to getuniverse/gson that referenced this pull request Sep 14, 2024
* Document how `JsonAdapter` creates adapter instances & add tests

* Extend `JsonAdapter.nullSafe()` documentation

* Improve test for JsonAdapter factory returning null

Existing test `JsonAdapterNullSafeTest` had misleading comments; while it
did in the end detect if null had not been handled correctly, that only
worked because the field `JsonAdapterFactory.recursiveCall` is static and
one test method therefore affected the state of the other test method.
If the test methods were run separately in different test runs, they would
not have detected if null was handled correctly, because the factory would
not have returned null.

* Extend JsonAdapter nullSafe test

* Extend test
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2 participants