feat(enhanced): implement layer-aware module sharing with comprehensive test coverage (PR9) (#3915)

Co-authored-by: Claude <[email protected]>

Author: ScriptedAlchemy

.changeset/comprehensive-consume-shared-tests.md

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+---
+"@module-federation/enhanced": patch
+---
+
+test: add test coverage for ConsumeSharedPlugin
+
+- Add 70+ tests for createConsumeSharedModule method covering all critical business logic
+- Implement tests for import resolution logic including error handling and direct fallback regex matching
+- Add requiredVersion resolution tests for package name extraction and version resolution
+- Implement include/exclude version filtering tests with fallback version support
+- Add singleton warning generation tests for version filters as specified
+- Implement package.json reading error scenarios and edge case handling
+- Add apply method tests for plugin registration logic and hook setup
+- Achieve test coverage parity with ProvideSharedPlugin (70+ tests each)

.changeset/comprehensive-provide-shared-tests.md

@@ -0,0 +1,14 @@
+---
+"@module-federation/enhanced": patch
+---
+
+test: add test coverage for ProvideSharedPlugin
+
+- Add 73 tests covering all critical business logic and edge cases
+- Implement complete shouldProvideSharedModule method coverage (15 tests) for version filtering with semver validation
+- Add provideSharedModule method tests (16 tests) covering version resolution, request pattern filtering, and warning generation
+- Implement module matching and resolution stage tests (20 tests) for multi-stage resolution logic
+- Validate business rules: warnings only for version filters with singleton, not request filters
+- Cover all critical private methods with proper TypeScript handling using @ts-ignore
+- Fix container utils mock for dependency factory operations
+- Add performance and memory usage tests for large-scale scenarios

.changeset/pr9-enhanced-layer-support.md

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+---
+"@module-federation/enhanced": patch
+---
+
+test: add test coverage for ConsumeSharedPlugin and ProvideSharedPlugin
+
+- Add 70+ tests for ConsumeSharedPlugin covering all critical business logic including multi-stage module resolution, import resolution logic, version filtering, and error handling
+- Add 73 tests for ProvideSharedPlugin covering shouldProvideSharedModule method, provideSharedModule method, module matching, and resolution stages
+- Fix minor bug in ProvideSharedPlugin where originalRequestString was used instead of modulePathAfterNodeModules for prefix matching
+- Add layer property to resolved provide map entries for better layer support
+- Improve test infrastructure stability and CI reliability with better assertions and mocking