PHPUnit 11 | AssertArrayWithListKeys trait: polyfill the Assert::assertArrayIsEqualToArrayOnlyConsideringListOfKeys() et al methods

[jrfnl]

PHPUnit 11.0.0 introduces the new Assert::assertArrayIsEqualToArrayOnlyConsideringListOfKeys(), Assert::assertArrayIsEqualToArrayIgnoringListOfKeys(), Assert::assertArrayIsIdenticalToArrayOnlyConsideringListOfKeys() and Assert::assertArrayIsIdenticalToArrayIgnoringListOfKeys() methods.

This commit:

• Adds two traits with the same name. One to polyfill the methods when not available in PHPUnit. The other - an empty trait - to allow for use-ing the trait in PHPUnit versions in which the methods are already natively available.
• Logic to the custom autoloader which will load the correct trait depending on the PHPUnit version used.
• An availability test and limited functional tests for the functionality polyfilled.

Includes:

• Adding the new polyfill to the existing TestCases classes.

Refs:

• sebastianbergmann/phpunit#5600
• sebastianbergmann/phpunit#5716
• sebastianbergmann/phpunit#5729

[coveralls]

coverage: 97.276% (+0.1%) from 97.152% when pulling 318912302c43c54d6bc64f9f44b94043bc90a5c1 on feature/3.x/new-assertarraywithlistkeys-polyfill-trait into 5aa05612c0a15e0b20d41ceff47c2a48c52f4801 on 3.x.