Fix preference tests

Tests/TokamakReconcilerTests/PreferenceTests.swift

@@ -41,7 +41,9 @@ final class PreferenceTests: XCTestCase {
     }
     let reconciler = TestFiberRenderer(.root, size: .init(width: 500, height: 500))
       .render(TestView())
+    reconciler.turnRunLoop()
     reconciler.fiberChanged(reconciler.current)
+    reconciler.turnRunLoop()
   }
 
   func testOverlay() {
@@ -52,25 +54,16 @@ final class PreferenceTests: XCTestCase {
           .preference(key: TestKey.self, value: 3)
           .overlayPreferenceValue(TestKey.self) {
             Text("\($0)")
+              .identified(by: "overlay")
           }
       }
     }
 
     let reconciler = TestFiberRenderer(.root, size: .init(width: 500, height: 500))
       .render(TestView())
-    var overlayValue: FiberReconciler<TestFiberRenderer>.Fiber? {
-      reconciler.current // RootView
-        .child? // LayoutView
-        .child? // ModifiedContent
-        .child? // _ViewModifier_Content
-        .child? // TestView
-        .child? // _DelayedPreferenceView
-        .child? // ModifiedContent
-        .child? // _OverlayLayout
-        .child?.sibling? // _PreferenceReadingView
-        .child
-    }
 
-    reconciler.expect(overlayValue, equals: Text("5"))
+    reconciler.turnRunLoop()
+
+    XCTAssertEqual(reconciler.findView(id: "overlay").view, Text("5"))
   }
 }

Tests/TokamakReconcilerTests/VisitorTests.swift

@@ -20,40 +20,6 @@ import XCTest
 @_spi(TokamakCore) @testable import TokamakCore
 import TokamakTestRenderer
 
-extension FiberReconciler {
-  /// Expect a `Fiber` to represent a particular `View` type.
-  func expect<V>(
-    _ fiber: Fiber?,
-    represents viewType: V.Type,
-    _ message: String? = nil
-  ) where V: View {
-    guard case let .view(view, _) = fiber?.content else {
-      return XCTAssert(false, "Fiber does not exit")
-    }
-    if let message = message {
-      XCTAssert(type(of: view) == viewType, message)
-    } else {
-      XCTAssert(type(of: view) == viewType)
-    }
-  }
-
-  /// Expect a `Fiber` to represent a `View` matching`testView`.
-  func expect<V>(
-    _ fiber: Fiber?,
-    equals testView: V,
-    _ message: String? = nil
-  ) where V: View & Equatable {
-    guard case let .view(fiberView, _) = fiber?.content else {
-      return XCTAssert(false, "Fiber does not exit")
-    }
-    if let message = message {
-      XCTAssertEqual(fiberView as? V, testView, message)
-    } else {
-      XCTAssertEqual(fiberView as? V, testView)
-    }
-  }
-}
-
 final class VisitorTests: XCTestCase {
   func testCounter() {
     struct TestView: View {