[TEST] Increase Test Coverage to 90%+ Across All Modules

[montge]

Objective

Increase DDF unit test coverage to 90%+ overall, with individual modules, functions, interfaces, classes, and branches at 80%+ minimum.

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Current State

Metric	Current	Target
Modules with tests	269 (49%)	500+ (90%)
Modules without tests	279 (51%)	<50 (10%)
Coverage threshold	75%	90%
Branch coverage	75%	80%

JaCoCo Configuration:

• Version: 0.8.12
• Current thresholds: 75% instruction, 75% branch, 75% complexity
• Halt on failure: enabled

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Priority Modules Requiring Tests

Security Modules (HIGH PRIORITY)

Platform security is critical infrastructure. These modules need comprehensive coverage:

• platform/security/filter/ - Security filters
• platform/security/handler/ - Authentication handlers
• platform/security/interceptor/ - CXF interceptors
• platform/security/pdp/ - Policy Decision Point
• platform/security/realm/ - Security realms

Catalog Core (HIGH PRIORITY)

Core catalog functionality:

• catalog/core/catalog-core-standardframework/
• catalog/core/catalog-core-api-impl/
• catalog/plugin/ - All catalog plugins

Integration & Federation (MEDIUM PRIORITY)

• catalog/opensearch/
• catalog/spatial/
• Federated source implementations

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Implementation Plan

Phase 1: Infrastructure (Week 1)

• [ ] Update JaCoCo thresholds to 80% minimum
• [ ] Add coverage report aggregation
• [ ] Create CI coverage gate

Phase 2: Security Module Tests (Weeks 2-4)

• [ ] security-filter-* modules
• [ ] security-handler-* modules
• [ ] security-interceptor-* modules
• [ ] security-pdp-* modules

Phase 3: Catalog Core Tests (Weeks 5-7)

• [ ] catalog-core-* modules
• [ ] catalog-plugin-* modules
• [ ] catalog-transformer-* modules

Phase 4: Remaining Modules (Weeks 8-10)

• [ ] platform/* remaining
• [ ] libs/* modules
• [ ] distribution/* tests

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Acceptance Criteria

• [ ] All modules with src/main/java have corresponding src/test/java
• [ ] Overall project coverage ≥ 90%
• [ ] Individual module coverage ≥ 80%
• [ ] Branch coverage ≥ 80%
• [ ] CI enforces coverage gates
• [ ] No regressions in existing test suites

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Technical Notes

Test Framework:

• JUnit 4/5 with Mockito
• Hamcrest matchers
• Pax Exam for OSGi integration tests

Coverage Configuration:

<jacoco.instruction.covered.ratio>0.90</jacoco.instruction.covered.ratio>
<jacoco.branch.covered.ratio>0.80</jacoco.branch.covered.ratio>

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Related Issues

• #6936 - Commons-Collections upgrade (requires test updates)
• #6935 - Spring Framework upgrade (requires test updates)