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apple/PhysarumApp/Tests/AudioTuningCodableTests.swift

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import XCTest
@testable import Physarum

final class AudioTuningCodableTests: XCTestCase {
    // A `_tuning.json` written before the balance constants existed must still decode:
    // the synthesised decoder would throw on the missing keys and drop the user into the
    // corrupt-file fallback, silently losing values tuned on the device.
    func testDecodesLegacyFileWithoutBalanceKeys() throws {
        let legacy = Data(#"{"envCoef":0.3,"gateLo":0.05,"gateHi":0.25}"#.utf8)
        let t = try JSONDecoder().decode(AudioTuning.self, from: legacy)
        XCTAssertEqual(t.envCoef, 0.3, accuracy: 1e-6)
        XCTAssertEqual(t.gateLo, 0.05, accuracy: 1e-6)
        XCTAssertEqual(t.gateHi, 0.25, accuracy: 1e-6)
        XCTAssertTrue(t.adaptiveBalance)
        XCTAssertEqual(t.peakTau, 4.0, accuracy: 1e-6)
        XCTAssertEqual(t.valleyTau, 8.0, accuracy: 1e-6)
        XCTAssertEqual(t.minSpan, 0.08, accuracy: 1e-6)
    }

    func testRoundTripPreservesAllFields() throws {
        var t = AudioTuning()
        t.peakTau = 6.5
        t.adaptiveBalance = false
        let data = try JSONEncoder().encode(t)
        let back = try JSONDecoder().decode(AudioTuning.self, from: data)
        XCTAssertEqual(back, t)
    }

    func testDefaultsMatchSpec() {
        let t = AudioTuning()
        XCTAssertEqual(t.peakFloor, 0.02, accuracy: 1e-6)
        XCTAssertEqual(t.bandGateLo, 0.06, accuracy: 1e-6)
        XCTAssertEqual(t.bandGateHi, 0.15, accuracy: 1e-6)
    }
}