chore(tests) #20 Add missing tests

[njoubert-cleverage]

Description

Fixes #20.

Completes the tests added with #22, #23 (PR #24) and #25 (PR #26), which covered the fixed behaviours:

• GetTaskTest: stored null value, key from the process context, empty array input, input overriding adapter, unknown adapter (MissingAdapterException), options validated at initialization (missing required option, undefined option, invalid type)
• SetTaskTest: no output, existing item overwritten, null value stored, key from the process context, unknown adapter, options validated at initialization
• AbstractCacheTaskTest (new): a custom task extending AbstractCacheTask gets its own options from the input, validated by its options resolver (as documented in index.md)
• AdapterTest (new): code, and every PSR-6 method forwarded to the decorated pool
• CleverAgeCacheProcessExtensionTest (new): registry service, both tasks registered as non-shared services with the registry as argument and a public alias on their class (used as @<class> in process configurations)
• CleverAgeCacheProcessBundleTest (new): getPath() is the bundle root, build() registers RegisterAdaptersPass

Coverage: 56/56 lines (44 tests).

The empty key case (placeholder key: '' not overridden by the input) is not tested: the key validation belongs to the adapter, and ArrayAdapter only validates keys with assert(), so no exception is thrown with zend.assertions=-1 (production php.ini, as used by the CI).

Requirements

• Documentation updates
  • Reference
  • Changelog
• Unit tests

Breaking changes

None (tests only).

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