Feature: Scale test fixtures and performance baselines
  As a performance engineer
  I want to validate scale test fixtures and threshold matrices
  So that performance baselines are well-formed and realistic

  Background:
    Given a scale test environment is ready

  # ──────────────────────────────────────────────────
  # Section 1: Fixture loading and metadata validation
  # ──────────────────────────────────────────────────

  Scenario: Load scale metadata fixture from disk
    When I scale test load the scale metadata fixture
    Then the scale test metadata should contain a schema version
    And the scale test metadata should contain scale profiles

  Scenario: Scale metadata contains all required profiles
    When I scale test load the scale metadata fixture
    Then the scale test metadata should have exactly 3 profiles
    And the scale test profile names should be "small, medium, large"

  Scenario: Each scale profile has required fields
    When I scale test load the scale metadata fixture
    Then each scale test profile should have a file count
    And each scale test profile should have a total size in megabytes
    And each scale test profile should have a language mix
    And each scale test profile should have expected index time
    And each scale test profile should have expected decomposition time

  Scenario: Scale metadata lists supported languages
    When I scale test load the scale metadata fixture
    Then the scale test metadata should list supported languages
    And the scale test supported languages should include "python"
    And the scale test supported languages should include "javascript"

  # ──────────────────────────────────────────────────
  # Section 2: Threshold matrix validation
  # ──────────────────────────────────────────────────

  Scenario: Load baseline thresholds fixture from disk
    When I scale test load the baseline thresholds fixture
    Then the scale test thresholds should contain a schema version
    And the scale test thresholds should have indexing section
    And the scale test thresholds should have decomposition section

  Scenario: Indexing thresholds cover all file counts
    When I scale test load the baseline thresholds fixture
    Then the scale test indexing thresholds should cover "1000_files"
    And the scale test indexing thresholds should cover "5000_files"
    And the scale test indexing thresholds should cover "10000_files"

  Scenario: Each indexing threshold has percentile fields
    When I scale test load the baseline thresholds fixture
    Then each scale test indexing threshold should have p50 p95 and p99

  Scenario: Decomposition thresholds cover all file counts
    When I scale test load the baseline thresholds fixture
    Then the scale test decomposition thresholds should cover "1000_files"
    And the scale test decomposition thresholds should cover "5000_files"
    And the scale test decomposition thresholds should cover "10000_files"

  Scenario: Each decomposition threshold has percentile fields
    When I scale test load the baseline thresholds fixture
    Then each scale test decomposition threshold should have p50 p95 and p99

  Scenario: Thresholds are monotonically increasing across percentiles
    When I scale test load the baseline thresholds fixture
    Then scale test indexing p50 should be less than p95 for all file counts
    And scale test indexing p95 should be less than p99 for all file counts

  # ──────────────────────────────────────────────────
  # Section 3: Language mix distribution validation
  # ──────────────────────────────────────────────────

  Scenario: Language mix sums to 1.0 for each profile
    When I scale test load the scale metadata fixture
    Then the scale test language mix should sum to 1.0 for each profile

  Scenario: Language mix values are between 0 and 1
    When I scale test load the scale metadata fixture
    Then each scale test language mix value should be between 0 and 1

  Scenario: All languages in mix are in supported languages list
    When I scale test load the scale metadata fixture
    Then all scale test language mix keys should be in supported languages

  # ──────────────────────────────────────────────────
  # Section 4: Scale profile simulation
  # ──────────────────────────────────────────────────

  Scenario: Generate file count distribution for small profile
    When I scale test generate file distribution for the "small" profile
    Then the scale test total generated file count should be 1000
    And the scale test generated distribution should match the language mix

  Scenario: Generate file count distribution for medium profile
    When I scale test generate file distribution for the "medium" profile
    Then the scale test total generated file count should be 5000
    And the scale test generated distribution should match the language mix

  Scenario: Generate file count distribution for large profile
    When I scale test generate file distribution for the "large" profile
    Then the scale test total generated file count should be 10000
    And the scale test generated distribution should match the language mix

  # ──────────────────────────────────────────────────
  # Section 5: Baseline threshold realism checks
  # ──────────────────────────────────────────────────

  Scenario: Indexing thresholds scale sub-linearly with file count
    When I scale test load the baseline thresholds fixture
    Then scale test 10K indexing p50 should be less than 10x the 1K p50

  Scenario: Decomposition thresholds exceed indexing thresholds
    When I scale test load the baseline thresholds fixture
    Then scale test decomposition p50 should be greater than indexing p50 for each file count

  Scenario: Memory thresholds are present and realistic
    When I scale test load the baseline thresholds fixture
    Then the scale test thresholds should have memory usage section
    And scale test memory peak should exceed steady state for each file count