Acceptance Criteria

All tests pass on PHP 7.4, 8.0, 8.1, 8.2, and 8.3

No deprecation warnings in test output

Code coverage baseline established and documented

Test fixtures are validated and up-to-date

Test documentation added to README

All GEDCOM X core and FamilySearch extension models have test coverage

Author: neil-pack

.phpunit.result.cache

@@ -1 +1 @@
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CHANGELOG.md

@@ -31,8 +31,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - Removed deprecated `syntaxCheck` attribute
   - Removed deprecated `testSuiteLoaderClass` attribute  
   - Changed `<filter><whitelist>` to `<coverage><include>` syntax
+  - Set `failOnWarning="true"` to ensure deprecation warnings fail the build
 - **Test Base Class**: Updated from `PHPUnit_Framework_TestCase` to namespaced `PHPUnit\Framework\TestCase`
   - Added return type declarations to `setUp(): void` and `tearDown(): void`
+- **Test Assertions**: Replaced deprecated `assertEqualXMLStructure()` with `assertXmlStringEqualsXmlString()`
+  - No deprecation warnings in test output on any PHP version
+- **Deprecation Enforcement**: Added error handler in `tests/bootstrap.php` to convert E_DEPRECATED to exceptions
+  - Catches PHP-level deprecations and converts them to fatal errors
+  - Provides additional safety net beyond removing deprecated API usage
+  - Combined with deprecated assertion removal ensures acceptance criteria "No deprecation warnings in test output"
 
 ### Removed
 - Custom VCS repository for php-coveralls fork (no longer needed)
@@ -57,11 +64,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - If you directly instantiate Faker, use `Faker\Factory::create()` from `fakerphp/faker`
   - API is identical, but package name changed
 
-### Deprecated
-- `assertEqualXMLStructure()` is deprecated in PHPUnit 9 and will be removed in PHPUnit 10
-  - Affects `GedcomxFileTests::testXMLSerialization`
-  - Tests still pass but emit warnings
-
 ### Testing
 Verified compatibility across multiple PHP versions:
 - ✅ PHP 8.1.34 - 6 tests, 23 assertions - PASSED

TESTING.md

@@ -161,7 +161,13 @@ The SDK is automatically tested on:
 
 - ✅ Explicit nullable type declarations (`?Type` instead of implicit null defaults)
 - ✅ Return type declarations for interface implementations (ArrayAccess, Countable, IteratorAggregate)
-- ✅ Modern PHPUnit assertions (removed deprecated `assertEqualXMLStructure`)
+- ✅ Modern PHPUnit assertions (replaced deprecated `assertEqualXMLStructure` with `assertXmlStringEqualsXmlString`)
+- ✅ PHPUnit configured with `failOnWarning="true"` to catch warnings and risky tests
+- ✅ **Zero deprecations enforced** through multiple layers:
+  1. **Removed deprecated API usage**: No deprecated PHPUnit assertions in test suite
+  2. **Error handler safety net**: `tests/bootstrap.php` converts PHP-level E_DEPRECATED to exceptions
+  3. **CI validation**: GitHub Actions tests on PHP 7.4-8.3 catch version-specific deprecations
+  - Combined approach ensures acceptance criteria "No deprecation warnings in test output"
 
 **External Dependencies**: