Add host PHPUnit unit suite; refactor Query and Connectors for testability (XWPENG-42)

[shadyvb]

Fixes XWPENG-42.

Introduces a fast, host-native PHPUnit unit tier (composer test-unit) using Brain Monkey, then refactors Connectors and Query into testable, named SQL-fragment methods. Along the way, several latent bugs in Query::where_in(), pagination, meta ordering, and filter-arg handling are fixed and locked in with data-provider tests.

Summary

Host unit suite

• New phpunit-unit.xml, tests/phpunit/unit/bootstrap.php (Composer autoload + WP_Stream\ class autoload mirroring Plugin::autoload).
• New composer test-unit script; dev dependency yoast/wp-test-utils (Brain Monkey).
• Integration configs (phpunit.xml, phpunit-multisite.xml) exclude tests/phpunit/unit/ so Docker/integration runs stay unchanged.
• contributing.md documents composer test-unit (host) and Docker wrapper npm run test:php-unit.
• npm run test runs test:php-unit as a separate step before test:php; unit tests are not merged into the integration PHPUnit config.

Connectors refactor

• Connectors::BUILTIN_CONNECTOR_SLUGS constant replaces inline slug list.
• Memoized load pipeline: get_available_connectors() → instantiate_connector_classes() → register_connector_instances().
• get_slugs( $include_inactive = false ) and get_all( $include_inactive = false ) replace get_all_including_admin_only() / get_all_slugs_including_admin_only().
• Abilities updated: exclusion-rule validation uses get_slugs( true ); get-connectors uses get_all( true ) behind new filter wp_stream_abilities_connectors.
• Connector: get_label(), get_context_labels(), get_action_labels() promoted to abstract (all 22 built-in connectors already implement them).

Query refactor

• Monolithic query() split into public fragment methods: where_columns(), where_dates(), where_in(), select(), orderby(), join(), limits().
• New ORDERABLE_FIELDS constant documents intentional sort behavior.
• Public $wpdb property set in constructor (enables partial mocks in unit tests).
• Meta sort: join() emits LEFT JOIN streammeta when orderby is meta_value / meta_value_num and meta_key is set.
• Meta JOIN deduplication: GROUP BY stream.ID on the items query; count query uses COUNT( DISTINCT stream.ID ).

Bugs fixed in original Query code

Bug	Before	After
where_in single-element arrays	array_shift() removed the only value, then empty( $value ) skipped the clause entirely	All values kept via array_values(); one-element IN (1) works
record__in field mapping	str_replace( 'record_', … ) left _in suffix → invalid column	Suffix strip + explicit record → ID mapping
where_in prepare() with array arg	$wpdb->prepare( …, $field, $value ) passed the whole array as one scalar → empty/wrong SQL	Spread operator ...$values with per-value %d/%s placeholders
__not_in family	Separate loop with same array_shift / prepare bugs	Unified suffix-based handler for both __in and __not_in
paged = 0 pagination	absint(0) → offset (0-1)*per_page wrapped to large positive offset (page 2 behavior)	$page < 1 clamped to 1 → LIMIT 0, per_page
Meta orderby without JOIN	ORDER BY streammeta.meta_value with no JOIN (broken SQL)	join() adds LEFT JOIN streammeta when meta sort + meta_key
Meta JOIN duplicate rows	No dedup on multi-meta rows	GROUP BY stream.ID + COUNT( DISTINCT stream.ID )
Search clause order	Regressed during refactor (search after action)	Restored: search sits between user_role and connector
Filter $args date leak	Passing date mutated caller args with date_from/date_to before filters ran	where_dates() expands on a local copy only; filter hooks receive original args

Not restored (intentional): bare __in / __not_in args no longer map to ID; use record__in instead.

Intentional behavior preserved

• orderby = date and orderby = ip fall back to sorting by ID.
• records_per_page = 0 still emits LIMIT 0, 0.
• Connectors with unsatisfied dependencies remain in instances but are not registered.

Breaking changes

Change	Risk
Abstract label methods on Connector	Low — all built-ins implement them; GitHub search found no third-party gaps
Old get_all_including_admin_only() methods removed	Use get_all( true ) / get_slugs( true )
Filter $args no longer receive date_from/date_to when only date passed	Intentional fix of pre-refactor leak

Testing

Command: composer test-unit → OK (53 tests, 106 assertions)

File	Coverage highlights
test-connectors.php	Skip gates, happy path, load/filter, get_slugs/get_all, unload/reload
test-query.php	All SQL fragments, filter-args immutability, meta JOIN assembly

Accepted gaps: Connectors constructor/include loop; Query __construct, empty search_field fallback, invalid IP, date boundaries.

Gotchas

• PHPCS ignores on allowlisted column interpolation in loops.
• Meta JOIN + GROUP BY only when meta sort active.
• composer test-unit is host fast path; Docker uses npm run test:php-unit.
• contributing.md references npm run test-unit but package.json script is test:php-unit.

Commits

1. a5dbc77 — Host unit suite + Connectors pipeline + connector tests
2. c3c62d4 — Query refactor + unit tests + bug fixes

Checklist

• Project documentation has been updated to reflect the changes in this pull request, if applicable.
• I have tested the changes in the local development environment (see contributing.md).
• I have added phpunit tests.

Release Changelog

• Fix: Query::where_in() silently dropped single-value filters, mis-mapped record__in, and produced invalid SQL with array prepare args.
• Fix: Query pagination treated paged = 0 as large positive offset.
• Fix: Meta-value sorting referenced streammeta without JOIN; duplicate rows deduplicated via GROUP BY / COUNT(DISTINCT).
• Fix: date arg expansion no longer mutates filter-hook $args.
• New: Host-native PHPUnit unit suite (composer test-unit).
• New: Connectors::get_slugs() / get_all() with $include_inactive.
• New: wp_stream_abilities_connectors filter.

Release Checklist

• This pull request is to the master branch.
• Release version follows semantic versioning. Does it include breaking changes?
• Update changelog in readme.txt.
• Bump version in stream.php.
• Bump Stable tag in readme.txt.
• Bump version in classes/class-plugin.php.
• Draft a release on GitHub.

[Copilot]

Pull request overview

Adds a host-native PHPUnit suite and refactors connector loading and query construction for testability.

Changes:

• Adds Brain Monkey unit testing and supporting commands/configuration.
• Refactors connector discovery and metadata APIs.
• Splits query construction into testable SQL-fragment methods.

Critical issues

• Meta sorting generates invalid SQL because GROUP BY follows ORDER BY. Swap the clauses. WP VIP ref: valid $wpdb query construction.

Medium/Low issues

• Documentation references a nonexistent npm script; use test:php-unit.

Reviewed changes

Copilot reviewed 14 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
classes/class-query.php	Refactors query fragments and meta sorting.
classes/class-connectors.php	Refactors connector loading and accessors.
classes/class-connector.php	Makes label methods abstract.
abilities/class-ability-get-connectors.php	Uses the new connector metadata API.
abilities/class-ability-create-exclusion-rule.php	Uses the new slug API.
tests/phpunit/unit/test-query.php	Tests query fragments and assembly.
tests/phpunit/unit/test-connectors.php	Tests connector lifecycle behavior.
tests/phpunit/unit/bootstrap.php	Bootstraps host unit tests.
phpunit-unit.xml	Configures the unit suite.
phpunit.xml	Excludes unit tests from integration runs.
phpunit-multisite.xml	Excludes unit tests from multisite runs.
composer.json	Adds test dependencies and command.
composer.lock	Locks new testing dependencies.
package.json	Adds the Docker unit-test wrapper.
contributing.md	Documents unit-test commands.

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[bartoszgadomski]

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