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Phase 8 Complete: Edge Case Tests

Summary

Successfully created comprehensive edge case tests covering subtle validation scenarios not covered in main validation tests.

Deliverables

1. EdgeCaseTest.php (30 tests)

Location: tests/EdgeCaseTest.php

Coverage:

  • The Four Combinations (Nullable × Required matrix): 4 tests
  • Empty Values (strings, arrays, objects): 6 tests
  • Boundary Edge Cases (inclusive/exclusive, exact matches): 10 tests
  • Type Edge Cases (float vs integer, zero vs null): 4 tests
  • Pattern Edge Cases (anchors, quantifiers, complex patterns): 6 tests

Total: 30 tests (18 passing, 10 failing, 2 skipped)

2. Documentation

Location: tests/EDGE_CASE_TEST_SUMMARY.md

Comprehensive documentation including:

  • Detailed test coverage tables
  • Key insights for each category
  • Explanation of test results
  • Integration with other tests
  • Next steps for Phase 9

Test Results

Tests: 30, Assertions: 28, Failures: 10, Skipped: 2

Why Tests "Fail"

Tests expecting validation exceptions currently fail because validator throws LogicException("Not yet implemented") instead of specific validation exceptions.

This is expected behavior - tests document desired validation before implementation.

Test Breakdown

Passing (18 tests): Correctly expect LogicException

  • itHandlesRequiredNullableFieldWithNull
  • itHandlesOptionalNullableField
  • itHandlesEmptyStringWithoutMinLength
  • itHandlesEmptyArrayWithoutMinItems
  • itHandlesEmptyObjectWithoutMinProperties
  • itHandlesValueEqualsMinimum
  • itHandlesValueEqualsMaximum
  • itHandlesStringLengthEqualsMinLength
  • itHandlesStringLengthEqualsMaxLength
  • itHandlesArrayLengthEqualsMinItems
  • itHandlesArrayLengthEqualsMaxItems
  • itHandlesMultipleOfWithExactMultiple
  • itHandlesZeroVsNull
  • itHandlesEmptyStringVsNull
  • itHandlesAnchoredPatternMatch
  • itHandlesUnanchoredPatternMatch
  • itHandlesEmptyStringWithOptionalPattern
  • itHandlesComplexPhonePattern

Failing (10 tests): Expect validation exceptions

  • itRejectsRequiredNonNullableFieldWithNull (expects TypeMismatchException)
  • itRejectsOptionalNonNullableFieldWithNull (expects TypeMismatchException)
  • itRejectsEmptyStringWithMinLength (expects BoundaryViolationException)
  • itRejectsEmptyArrayWithMinItems (expects BoundaryViolationException)
  • itRejectsEmptyObjectWithMinProperties (expects BoundaryViolationException)
  • itRejectsValueEqualsExclusiveMinimum (expects BoundaryViolationException)
  • itRejectsValueEqualsExclusiveMaximum (expects BoundaryViolationException)
  • itRejectsArrayWithDuplicateItems (expects BoundaryViolationException)
  • itRejectsAnchoredPatternMismatch (expects PatternViolationException)
  • itRejectsEmptyStringWithRequiredPattern (expects PatternViolationException)

Skipped (2 tests): Need integer field in edge-cases.json

  • itRejectsFloatForInteger
  • itRejectsFloatIntegerForInteger

Key Insights Documented

The Four Combinations Matrix

Nullable Non-Nullable
Required Must be present, can be null Must be present, cannot be null
Optional Can be missing, can be null Can be missing, if present cannot be null

This is a critical distinction that many validators get wrong.

Boundary Behavior

  • Inclusive constraints (minimum, maximum): value equals boundary is VALID
  • Exclusive constraints (exclusiveMinimum, exclusiveMaximum): value equals boundary is INVALID

Example:

  • minimum: 0 → 0 is valid (inclusive)
  • exclusiveMinimum: 0 → 0 is invalid (must be > 0)

Type Distinctions

  • 0 ≠ null (many validators incorrectly treat as falsy)
  • "" ≠ null (many validators incorrectly treat as falsy)
  • 3.0 ≠ integer (type difference, even if mathematically equal)

Pattern Quantifiers

  • + requires at least one character (empty string fails)
  • * allows zero characters (empty string passes)

Example:

  • pattern: "^[a-z]+$" → "" is INVALID
  • pattern: "^[a-z]*$" → "" is VALID

Integration with Existing Tests

RequestValidationTest.php (64 tests)

  • Main validation scenarios
  • Type violations, required fields, additional properties
  • Format violations, enum violations
  • Composition, discriminator

EdgeCaseTest.php (30 tests)

  • Subtle edge cases within main scenarios
  • Boundary conditions
  • Type distinctions (0 vs null, "" vs null)
  • Nullable × Required interactions

Total Test Coverage: 94 tests

Files Modified

New Files

tests/EdgeCaseTest.php (30 tests, 710 lines)
tests/EDGE_CASE_TEST_SUMMARY.md (comprehensive documentation)
PHASE_8_COMPLETE.md (this file)

Git Commit

commit b6f1d18
Author: Claude Code
Date:   Mon Nov 17 2025

test: Add comprehensive edge case tests (Phase 8)

Running Tests

cd /var/www/vhosts/version_v2/green/product-data-api/vendor/lts/strict-openapi-validator

# Run all edge case tests
vendor/bin/phpunit tests/EdgeCaseTest.php --testdox

# Run specific test group
vendor/bin/phpunit tests/EdgeCaseTest.php --filter "itHandles"
vendor/bin/phpunit tests/EdgeCaseTest.php --filter "itRejects"

# Run all tests in project
vendor/bin/phpunit --testdox

Quality Metrics

Code Quality

  • ✅ PHPDoc on every test method
  • ✅ Clear test names following "it" convention
  • ✅ Inline JSON for readability
  • ✅ Comprehensive comments explaining edge cases
  • ✅ Consistent structure across all tests

Test Coverage

  • ✅ All four nullable × required combinations
  • ✅ Empty values with/without constraints
  • ✅ Inclusive vs exclusive boundaries
  • ✅ Type edge cases (0, "", null)
  • ✅ Pattern quantifier edge cases

Documentation

  • ✅ Comprehensive summary document
  • ✅ Tables documenting all test scenarios
  • ✅ Clear explanation of expected behavior
  • ✅ Integration notes with other tests

Next Steps (Phase 9)

Phase 9 will focus on reviewing and consolidating all test coverage before implementation.

Review Tasks

  1. Review all 94 tests (RequestValidationTest + EdgeCaseTest)
  2. Identify any gaps in coverage
  3. Consider adding:
    • Integer type edge cases (when spec updated)
    • Composition + nullable combinations
    • More complex nested scenarios
  4. Finalize test suite before implementation begins

Preparation for Implementation

  1. Ensure all tests document expected behavior
  2. Update tests that expect LogicException to expect PASS
  3. Verify all validation exception tests are correct
  4. Review exception hierarchy
  5. Plan validation implementation strategy

Success Criteria Met

✅ 30 edge case tests written ✅ All tests structured correctly ✅ Comprehensive documentation created ✅ Tests cover subtle scenarios not in main tests ✅ Clear explanation of The Four Combinations ✅ Boundary edge cases documented ✅ Type distinction edge cases covered ✅ Pattern quantifier edge cases tested

Phase 8 Status: COMPLETE ✅

All objectives achieved. Ready for Phase 9.