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apple/PhysarumApp/Tests/RenderCoordinatorTests.swift

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import XCTest
import Metal
import PhysarumEngine
@testable import Physarum

/// Wiring tests for the live render path. The macOS test host has a real GPU,
/// so engine-backed construction is verifiable headlessly.
final class RenderCoordinatorTests: XCTestCase {
    private func anyPreset() -> Preset {
        PresetCatalog.loadAll().first ?? PresetCatalog.fallbackPreset
    }

    /// The coordinator starts on the real (non-square) target field so the first
    /// draw doesn't discard a freshly built square engine (startup double-build).
    func testInitAcceptsNonSquareInitialFieldAndTier() throws {
        guard MTLCreateSystemDefaultDevice() != nil else { throw XCTSkip("no Metal device") }
        let p = anyPreset()
        let c = RenderCoordinator(initialField: FieldSize(width: 512, height: 1110),
                                  tier: .phone, initialPreset: p, live: p.params)
        XCTAssertNotNil(c)
    }

    func testIsStructuralChange() {
        let p = anyPreset().params
        XCTAssertFalse(RenderCoordinator.isStructuralChange(p, p))   // identical → live adoption, no re-seed
        var count = p; count.agentCount = p.agentCount / 2 + 1
        XCTAssertTrue(RenderCoordinator.isStructuralChange(count, p))
        var pop = p; pop.species[0].populationShare += 0.1
        XCTAssertTrue(RenderCoordinator.isStructuralChange(pop, p))
    }
}