# REPL Testing Specification - PDMT Format
# Priority-Driven Monotonic Task specification for Ruchy REPL testing

meta:
  version: "1.0.0"
  project: ruchy
  component: repl
  owner: compiler-team
  created: 2024-01-15
  priority: CRITICAL
  estimated_effort: 4_weeks
  tracking_issue: "ruchy/issues/001"

objectives:
  primary: "Achieve 100% confidence in REPL correctness, performance, and robustness"
  metrics:
    - line_coverage: ">= 95%"
    - branch_coverage: ">= 90%"
    - mutation_score: ">= 95%"
    - latency_p99: "< 15ms"
    - memory_limit: "< 100MB"
    - fuzz_stability: "24h_without_crash"

constraints:
  - no_external_dependencies_for_core_tests
  - all_tests_must_be_deterministic
  - performance_tests_must_block_on_regression
  - zero_flaky_tests_tolerance

phases:
  - phase_1:
      name: "Foundation"
      duration: 1_week
      tasks:
        - task_1_1:
            name: "State Machine Property Testing"
            priority: P0
            effort: 2_days
            dependencies: []
            implementation:
              module: "tests/repl/properties.rs"
              test_count: 15
              property_iterations: 100_000
            deliverables:
              - state_transition_properties
              - invariant_preservation_tests
              - recovery_path_verification
            acceptance:
              - all_state_transitions_covered
              - no_invariant_violations_in_100k_iterations

        - task_1_2:
            name: "Basic Fuzzing Harness"
            priority: P0
            effort: 1_day
            dependencies: []
            implementation:
              module: "fuzz/targets/repl_input.rs"
              fuzzer: libfuzzer
              corpus_size: 1000
            deliverables:
              - grammar_aware_fuzzer
              - crash_reproduction_suite
              - memory_leak_detection
            acceptance:
              - 1_hour_continuous_fuzzing_without_crash

        - task_1_3:
            name: "Performance Benchmarks"
            priority: P0
            effort: 2_days
            dependencies: []
            implementation:
              module: "benches/repl_latency.rs"
              framework: criterion
              measurements:
                - startup_time
                - incremental_compilation
                - type_lookup
                - cache_hit_rate
            deliverables:
              - latency_benchmark_suite
              - memory_usage_tracking
              - regression_detection_scripts
            acceptance:
              - startup: "< 10ms"
              - eval: "< 1ms"
              - type_lookup: "< 10µs"

  - phase_2:
      name: "Robustness"
      duration: 1_week
      tasks:
        - task_2_1:
            name: "Grammar Coverage Fuzzing"
            priority: P0
            effort: 2_days
            dependencies: [task_1_2]
            implementation:
              module: "fuzz/targets/grammar_coverage.rs"
              coverage_target: "100%"
              ast_variants: 47
            deliverables:
              - complete_grammar_exerciser
              - coverage_report_generator
              - edge_case_corpus
            acceptance:
              - all_47_ast_variants_reached
              - 10k_unique_valid_programs_generated

        - task_2_2:
            name: "Mutation Testing Setup"
            priority: P1
            effort: 2_days
            dependencies: [task_1_1]
            implementation:
              tool: cargo-mutants
              targets:
                - error_recovery
                - incremental_compilation
                - type_inference_cache
            deliverables:
              - mutation_test_harness
              - survivor_analysis_report
              - test_improvement_patches
            acceptance:
              - mutation_score: ">= 95%"
              - all_error_paths_mutated

        - task_2_3:
            name: "Chaos Engineering Tests"
            priority: P1
            effort: 1_day
            dependencies: []
            implementation:
              module: "tests/repl/chaos.rs"
              scenarios:
                - memory_exhaustion
                - stack_overflow
                - infinite_loops
                - concurrent_sessions
            deliverables:
              - resource_limit_tests
              - recovery_verification
              - degradation_metrics
            acceptance:
              - graceful_oom_handling
              - timeout_enforcement: "< 150ms"
              - session_isolation_guaranteed

  - phase_3:
      name: "Integration"
      duration: 1_week
      tasks:
        - task_3_1:
            name: "Doctest Coverage"
            priority: P0
            effort: 2_days
            dependencies: []
            implementation:
              target_coverage: "100%"
              modules:
                - repl::eval
                - repl::types
                - repl::cache
                - repl::recovery
            deliverables:
              - comprehensive_doctests
              - usage_examples
              - api_documentation
            acceptance:
              - all_public_apis_documented
              - doctests_as_specification

        - task_3_2:
            name: "Example Workflows"
            priority: P1
            effort: 1_day
            dependencies: [task_3_1]
            implementation:
              directory: "examples/repl/"
              workflows:
                - data_science_pipeline
                - interactive_debugging
                - type_exploration
                - performance_profiling
            deliverables:
              - executable_examples
              - workflow_documentation
              - integration_tests
            acceptance:
              - all_examples_compile_and_run
              - real_world_usage_patterns_covered

        - task_3_3:
            name: "Golden Master Suite"
            priority: P1
            effort: 2_days
            dependencies: []
            implementation:
              directory: "tests/golden/"
              test_count: 50
              categories:
                - basic_expressions
                - type_inference
                - error_messages
                - dataframe_output
            deliverables:
              - golden_test_harness
              - baseline_outputs
              - diff_visualizer
            acceptance:
              - all_output_formats_covered
              - regression_detection_validated

  - phase_4:
      name: "CI Integration"
      duration: 1_week
      tasks:
        - task_4_1:
            name: "Benchmark Regression Detection"
            priority: P0
            effort: 1_day
            dependencies: [task_1_3]
            implementation:
              ci_system: github_actions
              threshold: 5_percent
              storage: benchmark_db
            deliverables:
              - ci_benchmark_job
              - regression_alerting
              - performance_dashboard
            acceptance:
              - automatic_pr_blocking_on_regression
              - historical_trend_tracking

        - task_4_2:
            name: "Continuous Fuzzing"
            priority: P0
            effort: 2_days
            dependencies: [task_1_2, task_2_1]
            implementation:
              platform: oss-fuzz
              targets: 3
              duration: continuous
            deliverables:
              - fuzzing_integration
              - crash_reproduction
              - coverage_reports
            acceptance:
              - 24h_stability_proven
              - automatic_issue_filing

        - task_4_3:
            name: "Coverage Reporting"
            priority: P1
            effort: 1_day
            dependencies: []
            implementation:
              tool: tarpaulin
              format: lcov
              integration: codecov
            deliverables:
              - coverage_ci_job
              - pr_coverage_diff
              - badge_generation
            acceptance:
              - per_pr_coverage_report
              - enforcement_rules_active

        - task_4_4:
            name: "Cross-Platform Matrix"
            priority: P0
            effort: 1_day
            dependencies: []
            implementation:
              platforms:
                - linux_x86_64
                - linux_aarch64
                - macos_x86_64
                - macos_arm64
                - windows_x86_64
              rust_versions:
                - stable
                - beta
                - "1.75"  # MSRV
            deliverables:
              - platform_test_matrix
              - platform_specific_tests
              - compatibility_report
            acceptance:
              - all_platforms_green
              - msrv_maintained

test_categories:
  correctness:
    - state_machine_properties
    - differential_testing
    - type_system_invariants

  robustness:
    - fuzzing
    - mutation_testing
    - error_recovery

  performance:
    - latency_benchmarks
    - memory_usage
    - cache_efficiency

  integration:
    - doctests
    - examples
    - golden_masters

quality_gates:
  pre_commit:
    - cargo_test: "< 1s"
    - cargo_clippy: "zero_warnings"
    - cargo_fmt: "formatted"

  pre_merge:
    - all_tests_pass
    - coverage_maintained
    - benchmarks_no_regression
    - fuzz_1hour_stable

  release:
    - mutation_score: ">= 95%"
    - fuzz_24hour_stable
    - all_platforms_tested
    - golden_masters_updated

risk_mitigation:
  high_risk_areas:
    - incremental_compilation_cache:
        mitigation: "extensive_property_testing"
        validation: "differential_testing"
    - error_recovery_paths:
        mitigation: "mutation_testing"
        validation: "fuzzing"
    - concurrent_sessions:
        mitigation: "thread_sanitizer"
        validation: "stress_testing"

success_metrics:
  technical:
    - zero_repl_crashes_in_production
    - p99_latency_under_15ms
    - memory_usage_under_100mb

  quality:
    - test_coverage_above_95_percent
    - mutation_score_above_95_percent
    - zero_flaky_tests

  user_impact:
    - repl_satisfaction_score: ">= 4.5/5"
    - bug_reports_per_release: "< 3"
    - performance_complaints: "0"

notes:
  - "State machine testing is highest priority - REPL is fundamentally stateful"
  - "Fuzzing must be grammar-aware to achieve meaningful coverage"
  - "Performance regression detection must be automated and blocking"
  - "Golden master tests prevent output format drift"
  - "Cross-platform testing essential for ecosystem adoption"