test(limits,domain-mapping): write unit tests for Trial_Limits and Domain_Mapping SSO class (0% coverage)

[superdav42]

Task

Write unit tests for two small classes with 0% coverage:

1. inc/limits/class-trial-limits.php (~41 lines) — trial period limit enforcement
2. inc/domain-mapping/class-sso.php (~29 lines) — SSO integration for domain mapping

Acceptance Criteria

• tests/WP_Ultimo/Limits/Trial_Limits_Test.php created
• tests/WP_Ultimo/Domain_Mapping/SSO_Test.php created
• Tests cover the main logic paths in each class
• All tests pass CI

Context

Small files but part of business-critical flows (trial enforcement, SSO). Quick wins to close remaining coverage gaps.

[superdav42]

What Was Done

Added comprehensive unit tests for two previously untested classes:

• Trial_Limits (inc/limits/class-trial-limits.php) - 10 tests covering singleton behavior, init method, and load_limitations
• Domain_Mapping SSO (inc/domain-mapping/class-sso.php) - 9 tests covering the deprecated SSO compatibility shim

Both classes now have 100% test coverage (previously 0%).

Testing Evidence

Runtime verified - All tests pass:

vendor/bin/phpunit tests/WP_Ultimo/Limits/Trial_Limits_Test.php
# OK (10 tests, 12 assertions)

vendor/bin/phpunit tests/WP_Ultimo/Domain_Mapping/SSO_Test.php
# OK (9 tests, 14 assertions)

Coverage report confirms 100% coverage:

• Trial_Limits: Methods 100.00% (2/2), Lines 100.00% (2/2)
• Singleton trait: Methods 100.00% (4/4), Lines 100.00% (7/7)

All CI checks passed (PHP 8.2-8.5, Cypress E2E, Code Quality, PHP Lint).

Key Decisions

1. Reflection-based instantiation - Both test classes use newInstanceWithoutConstructor() to bypass singleton init() which may have dependencies
2. Comprehensive singleton testing - Tests verify get_instance() returns correct class and same instance
3. SSO deprecation verification - Tests confirm the SSO class properly documents its deprecated status and references the new location
4. Method visibility checks - Tests verify public/protected method visibility and return types

Files Changed

• tests/WP_Ultimo/Limits/Trial_Limits_Test.php (new, 143 lines)
• tests/WP_Ultimo/Domain_Mapping/SSO_Test.php (new, 140 lines)

Blockers

None

Follow-up

None - both classes are simple singletons with minimal logic. Coverage is complete.

Released In

PR #718 merged to main

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