refactor: use Guava's EqualsTester for equals test
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WalkthroughA new Guava test dependency was added to the Bazel repositories configuration. Test methods in Changes
Sequence Diagram(s)sequenceDiagram
participant Test as Test Method
participant EqualsTester as Guava EqualsTester
participant Object as Test Objects
Test->>EqualsTester: Define equality groups with test objects
EqualsTester->>Object: Compare objects within and across groups
EqualsTester-->>Test: Report equality contract results
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Hello @albertocavalcante, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
Summary of Changes
Hello! Gemini here, providing a summary of this pull request to help everyone quickly understand the changes.
This PR refactors the existing equals() test methods in GrammarTest.java and NamespaceTest.java to utilize Guava's EqualsTester. This standardizes and simplifies the testing of the equals and hashCode contract for these classes. To achieve this, the guava-testlib dependency is added.
Highlights
- Refactor Tests: Replaced manual
assertEqualsandassertNotEqualscalls for testing theequals()method with Guava'sEqualsTesterinGrammarTestandNamespaceTest. - Dependency Update: Added the
com.google.guava:guava-testlibdependency to the Bazel repositories definition.
Changelog
- antlr/repositories.bzl
- Added
guava_testlibdependency with version33.4.8-jreand its SHA256 hash (a58a38746f97e02ae3d067b74a25ad2b136650227baa7124ce03fa3bce4e8576) at line 678.
- Added
- src/test/java/org/antlr/bazel/GrammarTest.java
- Imported
com.google.common.testing.EqualsTesterat line 16. - Removed the import for
assertNotEqualsat line 21. - Refactored the
equals()test method (lines 72-85) to useEqualsTesterto verify equality groups and inequality conditions, replacing the previous manual assertions.
- Imported
- src/test/java/org/antlr/bazel/NamespaceTest.java
- Imported
com.google.common.testing.EqualsTesterat line 5. - Refactored the
equals()test method (lines 24-37) to useEqualsTesterto verify equality groups and inequality conditions, replacing the previous manual assertions.
- Imported
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Code Review
This pull request effectively refactors the equals method tests in GrammarTest.java and NamespaceTest.java to use Guava's EqualsTester. This is a commendable improvement as EqualsTester provides a more comprehensive and idiomatic way to verify the contract of equals (and, by extension, its consistency with hashCode) methods, covering reflexivity, symmetry, transitivity, consistency with hashCode, and behavior with null and different types. The changes are clear, well-executed, and the new test dependency (guava-testlib) is correctly added and versioned consistently with the existing guava dependency. Overall, this enhances the reliability and maintainability of the test suite.
Summary of Findings
- Enhanced
equalsMethod Testing: The adoption of Guava'sEqualsTesteris a significant improvement. It provides a more comprehensive and robust mechanism for testing theequals(and its relationship withhashCode) contract compared to manual assertions. This change makes the tests clearer, more maintainable, and less prone to missing edge cases in theequalsimplementation. - Dependency Management: The
guava-testlibdependency was correctly added toantlr/repositories.bzlwith a version (33.4.8-jre) that matches the existingguavadependency, which is good practice for avoiding potential compatibility issues. The SHA256 checksum for the new dependency is also accurate. - Pull Request Description: The pull request description is currently empty. While the changes are straightforward due to the descriptive title, adding a brief note on the benefits of using
EqualsTester(e.g., 'Provides more comprehensive testing of equals/hashCode contracts, covering reflexivity, symmetry, transitivity, etc.') could offer valuable context for future reference and for reviewers less familiar withEqualsTester. This is a low-severity observation and was not added as a direct review comment due to the configured review settings.
Merge Readiness
The pull request is well-structured and significantly improves the robustness and clarity of the equals method tests by leveraging Guava's EqualsTester. The changes are correctly implemented, and the new dependency is appropriately managed. I find the code to be of high quality and the refactoring beneficial.
As an AI assistant, I am not authorized to approve pull requests. However, based on this review, the changes appear ready for merging after consideration and approval by the designated project maintainers.
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