EqualsVerifier

Source link: https://github.com/jqno/equalsverifier

EqualsVerifier can be used in Java unit tests to verify whether the contract for the equals and hashCode methods in a class is met. The Maven coordinates are:

<dependency>
  <groupId>nl.jqno.equalsverifier</groupId>
  <artifactId>equalsverifier</artifactId>
  <version>2.4</version>
  <scope>test</scope> </dependency>

For documentation, please see the project's website.

Pull requests are welcome! If you open one, please also register an issue or send a message to the Google Group, so we can discuss it.

Build

To build EqualsVerifier, you need Maven. Just call mvn clean verify from the command-line, and you're done. Alternatively, you can use any IDE with Maven support.

Project structure

src/

nl.jqno.equalsverifier
External API
nl.jqno.equalsverifier.internal
Classes internal to the operation of EqualsVerifier
nl.jqno.equalsverifier.internal.checkers
Checkers that perform EqualsVerifier's actual verifications
nl.jqno.equalsverifier.internal.exceptions
Internally used exceptions
nl.jqno.equalsverifier.internal.prefabvalues
Cache and factories for instances of all types
nl.jqno.equalsverifier.internal.reflection Helpers for reflection-based tasks
nl.jqno.equalsverifier.internal.util
Various helpers

test/

javax.persistence
Annotations used by integration tests
nl.jqno.equalsverifier
Unit tests for specific subcomponents of EqualsVerifier
nl.jqno.equalsverifier.coverage
Code coverage tests, which fail if coverage is less than 100%
nl.jqno.equalsverifier.integration.basic_contract
Integration tests that cover the contract as stated in java.lang.Object's javadoc
nl.jqno.equalsverifier.integration.extended_contract
Integration tests that cover specific corner cases in the Java language, and other essential points that are discussed in other sources, such as Effective Java, but not in the javadoc
nl.jqno.equalsverifier.integration.extra_features
Integration tests that cover non-standard situations that EqualsVerifier supports
nl.jqno.equalsverifier.integration.inheritance
Integration tests that cover inheritance in equality relations
nl.jqno.equalsverifier.integration.operational
Integration tests that cover issues that don't pertain to equals or hashCode themselves, but to EqualsVerifier's operation
nl.jqno.equalsverifier.testhelpers
Utility classes for use in tests
nl.jqno.equalsverifier.testhelpers.annotations
Annotations used by unit tests and integration tests
nl.jqno.equalsverifier.testhelpers.annotations.casefolding
More annotations which would clash with other annotations because of casing
nl.jqno.equalsverifier.testhelpers.types
Various data classes for use in unit tests and integration tests
nl.jqno.equalsverifier.util
Unit tests for the reflection helpers

lib/

equalsverifier-signedjar-test.jar A local Maven repository containing a signed jar, used to test potential ClassLoader issues
Here's how to install a jar into it:
```
mvn org.apache.maven.plugins:maven-install-plugin:2.3.1:install-file \

  -Dfile= -DgroupId= \

-DartifactId= -Dversion= \

  -Dpackaging= -DcreateChecksum=true \

  -DlocalRepositoryPath=lib 
```
The signed jar itself can be found in this repo.

Disclaimer

Source link: https://github.com/jqno/equalsverifier

Resources

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