import Foundation
import XCTest
@testable import VelodyPlayback

@MainActor
final class AVFoundationPlaybackEngineTests: XCTestCase {
    func testLoadTrackMissingFileThrowsPlaybackErrorAndLeavesEngineUnloaded() {
        let engine = AVFoundationPlaybackEngine(fileManager: .default)
        let fileURL = URL(fileURLWithPath: "/private/tmp/\(UUID().uuidString)-missing.mp3")

        XCTAssertThrowsError(try engine.loadTrack(at: fileURL, startTime: 0)) { error in
            XCTAssertEqual(
                error as? PlaybackError,
                .missingLocalFile(path: fileURL.path)
            )
        }

        XCTAssertEqual(engine.currentTime, 0)
        XCTAssertEqual(engine.duration, 0)
        XCTAssertFalse(engine.isPlaying)

        XCTAssertThrowsError(try engine.play()) { error in
            XCTAssertEqual(error as? PlaybackError, .noTrackLoaded)
        }
    }
}