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apple/PhysarumEngine/Tests/PhysarumEngineTests/TestFixtures.swift

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import Foundation
@testable import PhysarumEngine

/// Shared test data. A minimal-but-complete preset is kept inline so the sim /
/// render tests don't depend on the committed preset files (those are validated
/// separately in PresetCodableTests).
enum TestFixtures {
    static let minimalPresetJSON = """
    {"id":"t","name":"Test","builtIn":true,"tags":[],"tagSignal":"neural-bleed","params":{
      "agentCount":1000,"spawnPattern":"random",
      "species":[{"color":[0.9,0.6,0.2],"populationShare":1,"sensorAngle":0.5,"sensorDistance":9,"turnSpeed":0.3,"moveSpeed":1.5,"depositAmount":1},
                 {"color":[0,0,0],"populationShare":0,"sensorAngle":0,"sensorDistance":1,"turnSpeed":0,"moveSpeed":0,"depositAmount":0},
                 {"color":[0,0,0],"populationShare":0,"sensorAngle":0,"sensorDistance":1,"turnSpeed":0,"moveSpeed":0,"depositAmount":0}],
      "interactionMatrix":[[1,0,0],[0,1,0],[0,0,1]],
      "decayRate":0.95,"diffusionFreq":1,"fadeStrength":0,"trailSaturation":100,
      "chaosInterval":0,"chaosStrength":0,"rhythmAmplitude":0,"simSpeed":1,
      "backgroundColor":[0,0,0],"blendMode":"additive","exposure":1,"headIntensity":0,"kaleidoscope":0,
      "feedbackAmount":0,"bloomThreshold":1,"bloomIntensity":1,"vignette":0,"saturation":1,"contrast":1,
      "audioReactive":{"enabled":false,"gain":1,"autoGain":false,"routes":[]}}}
    """

    static func minimalPreset() throws -> Preset {
        try JSONDecoder().decode(Preset.self, from: Data(minimalPresetJSON.utf8))
    }

    /// Path to the committed canonical preset set (apple/presets), resolved from
    /// this source file. Returns nil if the layout doesn't match (e.g. SwiftPM
    /// copied sources elsewhere) so callers can XCTSkip gracefully.
    static func committedPresetsDir() -> URL? {
        let dir = URL(fileURLWithPath: #filePath)
            .deletingLastPathComponent()   // PhysarumEngineTests/
            .deletingLastPathComponent()   // Tests/
            .deletingLastPathComponent()   // PhysarumEngine/
            .deletingLastPathComponent()   // apple/
            .appendingPathComponent("presets")
        return FileManager.default.fileExists(atPath: dir.path) ? dir : nil
    }
}