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apple/PhysarumApp/Tests/PlayerPolicyTests.swift

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import XCTest
@testable import Physarum

/// Pure policy for when the live player pauses and how fast it runs —
/// the thermal/ambient behavior of an always-on visual app.
final class PlayerPolicyTests: XCTestCase {
    func testPauseWhenLibraryCoversCanvas() {
        XCTAssertTrue(playerShouldPause(libraryVisible: true, sceneActive: true))
    }

    func testPauseWhenSceneInactive() {
        XCTAssertTrue(playerShouldPause(libraryVisible: false, sceneActive: false))
    }

    func testRunsWhenVisibleAndActive() {
        XCTAssertFalse(playerShouldPause(libraryVisible: false, sceneActive: true))
    }

    func testFullFrameRateWhenCoolAndUnconstrained() {
        XCTAssertEqual(preferredFPS(thermalState: .nominal, lowPowerMode: false), 60)
    }

    func testHalfFrameRateUnderThermalPressure() {
        XCTAssertEqual(preferredFPS(thermalState: .fair, lowPowerMode: false), 30)
        XCTAssertEqual(preferredFPS(thermalState: .serious, lowPowerMode: false), 30)
        XCTAssertEqual(preferredFPS(thermalState: .critical, lowPowerMode: false), 30)
    }

    func testHalfFrameRateInLowPowerMode() {
        XCTAssertEqual(preferredFPS(thermalState: .nominal, lowPowerMode: true), 30)
    }

    func testDrawableScaleCappedAt2xOnNonDesktopTiers() {
        XCTAssertEqual(cappedDrawableScale(3.0, tier: .phone), 2.0)
        XCTAssertEqual(cappedDrawableScale(2.0, tier: .phone), 2.0)
        XCTAssertEqual(cappedDrawableScale(3.0, tier: .tablet), 2.0)
        XCTAssertEqual(cappedDrawableScale(3.0, tier: .desktop), 3.0)
    }
}