test: add unit test coverage for simple events, cache and parser

[ChristophWurst]

Generated tests for simple, boring code

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[Copilot]

Pull request overview

Adds PHPUnit unit test coverage for several small “value object” style classes in the Mail app (events + cache helpers) and for the HTML parser utility.

Changes:

• Add unit tests for OCA\Mail\Html\Parser::parseToDomDocument() across a few representative HTML inputs.
• Add unit tests asserting constructor/getter behavior for multiple OCA\Mail\Events\* event classes.
• Add unit tests for cache helpers (CachedMailbox, HordeSyncToken, HordeSyncTokenParser).

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/Unit/Html/ParserTest.php	Covers Parser::parseToDomDocument() with minimal/malformed/complex HTML inputs.
tests/Unit/Events/SynchronizationEventTest.php	Verifies SynchronizationEvent constructor + getters.
tests/Unit/Events/SaveDraftEventTest.php	Verifies SaveDraftEvent constructor + getters (with/without draft).
tests/Unit/Events/OutboxMessageCreatedEventTest.php	Verifies OutboxMessageCreatedEvent constructor + getters.
tests/Unit/Events/NewMessagesSynchronizedTest.php	Verifies NewMessagesSynchronized constructor + getters (incl. empty messages).
tests/Unit/Events/NewMessageReceivedEventTest.php	Verifies NewMessageReceivedEvent URI getter.
tests/Unit/Events/MessageSentEventTest.php	Verifies MessageSentEvent constructor + getters.
tests/Unit/Events/MessageFlaggedEventTest.php	Verifies MessageFlaggedEvent constructor + getters for set/unset cases.
tests/Unit/Events/MessageDeletedEventTest.php	Verifies MessageDeletedEvent constructor + getters.
tests/Unit/Events/MailboxesSynchronizedEventTest.php	Verifies MailboxesSynchronizedEvent account getter.
tests/Unit/Events/DraftSavedEventTest.php	Verifies DraftSavedEvent optional parameter combinations.
tests/Unit/Events/DraftMessageCreatedEventTest.php	Verifies DraftMessageCreatedEvent constructor + getters.
tests/Unit/Events/BeforeMessageDeletedEventTest.php	Verifies BeforeMessageDeletedEvent constructor + getters.
tests/Unit/Events/BeforeImapClientCreatedTest.php	Verifies BeforeImapClientCreated account getter.
tests/Unit/Cache/HordeSyncTokenTest.php	Verifies HordeSyncToken getters for full/null/partial inputs.
tests/Unit/Cache/HordeSyncTokenParserTest.php	Verifies HordeSyncTokenParser::parseSyncToken() for multiple token shapes.
tests/Unit/Cache/CachedMailboxTest.php	Verifies CachedMailbox defaults and setter/getter behavior.

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