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Test Coverage Progress

This document tracks the progress of test coverage improvements for the RIDDL project.

Summary Statistics

  • Total Tests: 573 passing (107 utils + 276 language + 190 passes)
  • Platform Coverage: JVM (573 tests) + Native (170 tests) = 743 total tests
  • Production Bugs Found and Fixed: 3
  • Test Files Created: 4 new test files
  • Test Files Improved: 6 files with magic number extraction
  • Test Files Removed: 6 experimental files with incorrect API usage

Completed Priorities

✅ Priority 1-4: Core Functionality Tests

Status: Already complete (existing test suite)

  • SeqHelpers: 40 tests covering all edge cases
  • StringHelpers: 43 tests covering all edge cases
  • Utils module: 107 tests total
  • Language parsing: 276 tests total
  • Passes/validation: 190 tests total

✅ Priority 5-6: Edge Cases and Error Paths

Status: Complete Date Completed: January 6, 2026

New Test Files Created

  1. ParserEdgeCaseTest.scala (595 lines)

    • Location: language/jvm/src/test/scala/com/ossuminc/riddl/language/parsing/
    • Tests: Empty inputs, whitespace-only inputs, very long identifiers/strings, Unicode, boundary values, deeply nested structures, maximum/minimum length inputs
    • Coverage: Parser edge cases including line endings (CRLF, LF, mixed)

  2. ParserErrorRecoveryTest.scala (544 lines)

    • Location: language/jvm/src/test/scala/com/ossuminc/riddl/language/parsing/
    • Tests: Malformed input handling, syntax error recovery, invalid token sequences, unclosed delimiters, premature end of input
    • Coverage: Error messages quality, multiple errors in single parse, invalid escape sequences

  3. FileIOErrorTest.scala (370 lines)

    • Location: language/jvm/src/test/scala/com/ossuminc/riddl/language/parsing/
    • Tests: Non-existent files, directory instead of file, empty files, whitespace-only files, binary files, very large files (10,000 types), invalid UTF-8, circular includes, deeply nested includes
    • Coverage: File I/O error handling, path validation, include file error handling

  4. IDEIntegrationTest.scala (592 lines)

    • Location: language/jvm/src/test/scala/com/ossuminc/riddl/language/
    • Tests: Incremental parsing (user typing simulation), location tracking accuracy, error recovery for partial input, performance under IDE-like load, multi-file project handling
    • Coverage: IDE-specific scenarios with performance thresholds

Files Removed (Incorrect API Usage)

  • ASTTraversalEdgeCaseTest.scala (tested non-existent Visitor/Folder/Iterator APIs)
  • ValidationErrorRecoveryTest.scala (needed major refactoring)
  • TypeValidationEdgeCaseTest.scala (API mismatches)
  • IncludeAndInteractionValidatorTest.scala (API mismatches)
  • OptionsValidationTestMigrated.scala (experimental)
  • EntityValidatorRefactoredExample.scala (experimental)
  • ValidationFixtures.scala (experimental, circular dependency)
  • ValidationFixturesExampleTest.scala (referenced removed trait)
  • ConcurrencyTest.scala (incorrect API usage)
  • PerformanceRegressionSpec.scala (experimental with errors)

✅ Priority 7: Test Clarity Improvements

Status: Complete Date Completed: January 6, 2026

Magic Number Extraction

Extracted magic numbers to named constants in 6 test files, improving readability and maintainability:

  1. IDEIntegrationTest.scala

    • Constants: 13 named constants
    • Categories: Performance timeouts (7), test data sizes (6), location tracking (2)
    • Example: SINGLE_PARSE_TIMEOUT_MS = 100, VERY_LARGE_FILE_TYPE_COUNT = 1000

  2. ParserEdgeCaseTest.scala

    • Constants: 6 named constants
    • Categories: String/identifier lengths (3), collection sizes (2), nesting depth (1)
    • Example: LONG_IDENTIFIER_LENGTH = 255, LARGE_MODEL_TYPE_COUNT = 1000

  3. FileIOErrorTest.scala

    • Constants: 2 named constants
    • Categories: Large file testing (2)
    • Example: VERY_LARGE_FILE_TYPE_COUNT = 10000, LARGE_FILE_PARSE_TIMEOUT_MS = 30000

  4. SeqHelpersTest.scala

    • Constants: 3 named constants
    • Categories: Large sequence testing (3)
    • Example: LARGE_SEQUENCE_SIZE = 10000, TEST_SEARCH_VALUE = 5000

  5. TimerTest.scala

    • Constants: 1 named constant
    • Example: TEST_TIMER_RETURN_VALUE = 123

  6. RiddlParserInputTest.scala

    • Constants: 1 named constant
    • Example: EXPECTED_OFFSET_AT_POSITION_2 = 38

Total Impact: 26 named constants created, ~41 magic number instances eliminated

Production Bugs Found and Fixed

During comprehensive test development, 3 production bugs were discovered and fixed:

Bug 1: SeqHelpers.popUntil - Incorrect Logic

File: utils/shared/src/main/scala/com/ossuminc/riddl/utils/SeqHelpers.scala Issue: Implementation used indexWhere with confusing logic that failed on edge cases Fix: Rewrote with simpler while loop: while stack.nonEmpty && !f(stack.top) do { stack.pop() } Tests: 5 test failures revealed the bug

Bug 2: StringHelpers.dropRightWhile - Empty String Exception

File: utils/shared/src/main/scala/com/ossuminc/riddl/utils/StringHelpers.scala Issue: Threw NoSuchElementException when called on empty string Fix: Added empty check: while result.nonEmpty && f(result.last) do result = result.dropRight(1) Tests: 2 test failures revealed the bug

Bug 3: StringHelpers.toPrettyString - Null Pointer Exception

File: utils/shared/src/main/scala/com/ossuminc/riddl/utils/StringHelpers.scala Issue: Threw NullPointerException when case class fields were null Fix: Added null case handling in pattern matching Tests: 1 test failure revealed the bug

Platform-Specific Test Organization

Tests were reorganized to properly support JVM and Native platforms:

JVM-Only Tests

These tests use JVM-specific features (java.nio.file) and were moved to jvm/ directories:

  • IDEIntegrationTest.scala
  • FileIOErrorTest.scala
  • ParserEdgeCaseTest.scala
  • ParserErrorRecoveryTest.scala

Cross-Platform Tests

Tests in jvm-native/ directories run on both JVM and Native:

  • All shared test infrastructure
  • Parser tests that don't use file I/O
  • AST tests
  • Basic functionality tests

Result: Native tests now pass cleanly (170 tests) without encountering JVM-specific code

Test Results by Module

Utils Module

  • JVM Tests: 107 passing
  • Status: ✅ All tests pass
  • Coverage: SeqHelpers, StringHelpers, Timer, Platform utilities
  • Bugs Fixed: 3 production bugs found and fixed

Language Module

  • JVM Tests: 276 passing
  • Native Tests: 170 passing
  • Status: ✅ All tests pass on both platforms
  • Coverage: Parsing, AST, Messages, File I/O (JVM only), IDE integration (JVM only)
  • New Files: 4 comprehensive test files added

Passes Module

  • JVM Tests: 190 passing
  • Status: ✅ All tests pass
  • Coverage: Validation, Resolution, Symbols, Diagrams
  • Files Removed: Experimental ValidationFixtures-based tests

Next Steps

Phase 1: Performance Optimization Preparation

  1. Establish performance baselines (Deferred - PerformanceRegressionSpec removed due to API issues)
  2. Document current performance characteristics
  3. Identify optimization candidates

Future Priorities (Not Started)

  • Priority 8: Additional IDE-specific scenarios
  • Priority 9: Concurrency and thread safety tests (deferred - API mismatches)
  • Priority 10: Performance regression suite (deferred - needs API review)

Lessons Learned

  1. API Discovery: Creating tests revealed that several assumed APIs don't exist (Visitor, Folder, Iterator patterns)
  2. Scala 3 Syntax: New tests must use then/do keywords for if/while statements
  3. Platform Separation: JVM-specific features (java.nio.file) must be in jvm/ directories, not jvm-native/
  4. Test Value: Comprehensive edge case tests found 3 real production bugs
  5. Maintainability: Extracting magic numbers to named constants significantly improves test readability

Documentation Updates

  • Create TEST-COVERAGE-PROGRESS.md (this file)
  • Update CONTRIBUTING.md with test guidelines
  • Document performance baseline expectations
  • Create test writing guide for new contributors

Verification Status

All test suites verified as of January 6, 2026:

✅ utils/test:     107 tests passing
✅ language/test:  276 tests passing (JVM)
✅ languageNative/test: 170 tests passing (Native)
✅ passes/test:    190 tests passing
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Total: 573 JVM tests + 170 Native tests = 743 total tests passing

Last Updated: January 6, 2026 Maintained by: Claude Code