diff --git a/Package@swift-5.10.swift b/Package@swift-5.10.swift
new file mode 100644
index 00000000..0fb17678
--- /dev/null
+++ b/Package@swift-5.10.swift
@@ -0,0 +1,79 @@
+// swift-tools-version:5.10
+
+import PackageDescription
+
+let packageName = "Layout"
+
+enum SwiftLint {
+    static let plugin = "SwiftLintPlugin-\(packageName)"
+    static let binary = "SwiftLintBinary-\(packageName)"
+}
+
+let package = Package(
+    name: packageName,
+    platforms: [
+        .iOS(.v13),
+    ],
+    products: [
+        .library(
+            name: "Layout",
+            targets: ["Layout"]),
+    ],
+    dependencies: [
+        .package(
+            url: "https://github.com/Quick/Nimble.git",
+            from: "13.0.0"),
+        .package(
+            url: "https://github.com/pointfreeco/swift-snapshot-testing.git",
+            from: "1.15.0"),
+    ],
+    targets: [
+        .target(
+            name: "Layout",
+            swiftSettings: .swiftSettings,
+            plugins: [
+                .plugin(name: SwiftLint.plugin),
+            ]),
+        .testTarget(
+            name: "LayoutTests",
+            dependencies: [
+                "Layout",
+                "Nimble",
+                .product(name: "SnapshotTesting", package: "swift-snapshot-testing"),
+            ],
+            exclude: [
+                "__Snapshots__",
+                "UIKit/__Snapshots__",
+            ],
+            swiftSettings: .swiftSettings,
+            plugins: [
+                .plugin(name: SwiftLint.plugin),
+            ]),
+        .plugin(
+            name: "SwiftLintCommand",
+            capability: .command(intent: .custom(verb: "swiftlint", description: "SwiftLint Command Plugin")),
+            dependencies: [
+                .target(name: SwiftLint.binary)
+            ]),
+        .plugin(
+            name: SwiftLint.plugin,
+            capability: .buildTool(),
+            dependencies: [
+                .target(name: SwiftLint.binary)
+            ],
+            path: "Plugins/SwiftLintPlugin"),
+        .binaryTarget(
+            name: SwiftLint.binary,
+            url: "https://github.com/realm/SwiftLint/releases/download/0.54.0/SwiftLintBinary-macos.artifactbundle.zip",
+            checksum: "963121d6babf2bf5fd66a21ac9297e86d855cbc9d28322790646b88dceca00f1"),
+    ]
+)
+
+extension Array where Element == SwiftSetting {
+
+    static var swiftSettings: [SwiftSetting] {
+        [
+            .enableExperimentalFeature("StrictConcurrency"),
+        ]
+    }
+}
diff --git a/Sources/Layout/LayoutItem/LayoutItems/ViewLayoutItem.swift b/Sources/Layout/LayoutItem/LayoutItems/ViewLayoutItem.swift
index fc0f2248..16c949ae 100644
--- a/Sources/Layout/LayoutItem/LayoutItems/ViewLayoutItem.swift
+++ b/Sources/Layout/LayoutItem/LayoutItems/ViewLayoutItem.swift
@@ -9,6 +9,8 @@
 
 import UIKit
 
+@preconcurrency
+@MainActor
 internal final class ViewLayoutItem: LayoutItem {
 
     // MARK: - LayoutBoundary
diff --git a/Tests/LayoutTests/Builders/ConstraintsBuilderTests.swift b/Tests/LayoutTests/Builders/ConstraintsBuilderTests.swift
index 53c338f2..660491e5 100644
--- a/Tests/LayoutTests/Builders/ConstraintsBuilderTests.swift
+++ b/Tests/LayoutTests/Builders/ConstraintsBuilderTests.swift
@@ -11,9 +11,9 @@ import Layout
 import Nimble
 import XCTest
 
-@MainActor
 final class ConstraintsBuilderTests: XCTestCase {
 
+    @MainActor
     func testConstraintsBuilder() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/Builders/LayoutBuilderTests.swift b/Tests/LayoutTests/Builders/LayoutBuilderTests.swift
index e52624a6..9af694af 100644
--- a/Tests/LayoutTests/Builders/LayoutBuilderTests.swift
+++ b/Tests/LayoutTests/Builders/LayoutBuilderTests.swift
@@ -11,9 +11,9 @@ import Layout
 import Nimble
 import XCTest
 
-@MainActor
 final class LayoutBuilderTests: XCTestCase {
 
+    @MainActor
     func testLayoutBuilder() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/LayoutExampleTests.swift b/Tests/LayoutTests/LayoutExampleTests.swift
index 53c8114d..41d2a1c5 100644
--- a/Tests/LayoutTests/LayoutExampleTests.swift
+++ b/Tests/LayoutTests/LayoutExampleTests.swift
@@ -11,11 +11,11 @@
 import Nimble
 import XCTest
 
-@MainActor
 final class LayoutExampleTests: XCTestCase {
 
     // MARK: - Readme
 
+    @MainActor
     func testReadmeExample() {
 
         // GIVEN
@@ -81,6 +81,7 @@ final class LayoutExampleTests: XCTestCase {
 
     // MARK: - Layout
 
+    @MainActor
     func testLayoutDocumentationExample() {
 
         // GIVEN
@@ -94,6 +95,7 @@ final class LayoutExampleTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testLayoutBuilderDocumentationExample() {
 
         // GIVEN
@@ -115,6 +117,7 @@ final class LayoutExampleTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testHorizontallyCenteringDocumentationExample() {
 
         // GIVEN
@@ -142,6 +145,7 @@ final class LayoutExampleTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testVerticallyCenteringDocumentationExample() {
 
         // GIVEN
@@ -171,6 +175,7 @@ final class LayoutExampleTests: XCTestCase {
 
     // MARK: - LayoutItem
 
+    @MainActor
     func testSingleLayoutItemDocumentationExample() {
 
         // GIVEN
@@ -185,6 +190,7 @@ final class LayoutExampleTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testMultipleLayoutItemsDocumentationExample() {
 
         // GIVEN
@@ -201,6 +207,7 @@ final class LayoutExampleTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testHorizontallyCenteringLayoutItemDocumentationExample() {
 
         // GIVEN
@@ -228,6 +235,7 @@ final class LayoutExampleTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testVerticallyCenteringLayoutItemDocumentationExample() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/LayoutItem/LayoutItems/UIView+LayoutItemTests.swift b/Tests/LayoutTests/LayoutItem/LayoutItems/UIView+LayoutItemTests.swift
index 85b9a0fb..2061bf38 100644
--- a/Tests/LayoutTests/LayoutItem/LayoutItems/UIView+LayoutItemTests.swift
+++ b/Tests/LayoutTests/LayoutItem/LayoutItems/UIView+LayoutItemTests.swift
@@ -12,9 +12,9 @@ import Layout
 import Nimble
 import XCTest
 
-@MainActor
 final class UIViewLayoutItemTests: XCTestCase {
 
+    @MainActor
     func testLayoutItemView() {
 
         // GIVEN
@@ -26,6 +26,7 @@ final class UIViewLayoutItemTests: XCTestCase {
         expect(view.layoutItemView) === view
     }
 
+    @MainActor
     func testSuperviewConstraints() {
 
         // GIVEN
@@ -37,6 +38,7 @@ final class UIViewLayoutItemTests: XCTestCase {
         expect(view.superviewConstraints(view)).to(beEmpty())
     }
 
+    @MainActor
     func testLayoutBoundary() {
 
         // GIVEN
@@ -57,6 +59,7 @@ final class UIViewLayoutItemTests: XCTestCase {
         expect(boundary.bottom) == view.bottomAnchor
     }
 
+    @MainActor
     func testLayoutCenter() {
 
         // GIVEN
@@ -73,6 +76,7 @@ final class UIViewLayoutItemTests: XCTestCase {
         expect(center.centerY) == view.centerYAnchor
     }
 
+    @MainActor
     func testLayoutSize() {
 
         // GIVEN
@@ -89,6 +93,7 @@ final class UIViewLayoutItemTests: XCTestCase {
         expect(size.height) == view.heightAnchor
     }
 
+    @MainActor
     func testLayoutBaseline() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/LayoutItem/LayoutItems/ViewLayoutItemTests.swift b/Tests/LayoutTests/LayoutItem/LayoutItems/ViewLayoutItemTests.swift
index fca8ce35..87847af1 100644
--- a/Tests/LayoutTests/LayoutItem/LayoutItems/ViewLayoutItemTests.swift
+++ b/Tests/LayoutTests/LayoutItem/LayoutItems/ViewLayoutItemTests.swift
@@ -11,9 +11,9 @@
 import Nimble
 import XCTest
 
-@MainActor
 final class ViewLayoutItemTests: XCTestCase {
 
+    @MainActor
     func testInitLayoutItemViewSuperviewConstraints() {
 
         // GIVEN
@@ -43,6 +43,7 @@ final class ViewLayoutItemTests: XCTestCase {
         expect(layoutItems === [viewLayoutItem]) == true
     }
 
+    @MainActor
     func testLayoutBoundary() {
 
         // GIVEN
@@ -63,6 +64,7 @@ final class ViewLayoutItemTests: XCTestCase {
         expect(boundary.bottom) == view.bottom
     }
 
+    @MainActor
     func testLayoutCenter() {
 
         // GIVEN
@@ -79,6 +81,7 @@ final class ViewLayoutItemTests: XCTestCase {
         expect(center.centerY) == view.centerY
     }
 
+    @MainActor
     func testLayoutSize() {
 
         // GIVEN
@@ -95,6 +98,7 @@ final class ViewLayoutItemTests: XCTestCase {
         expect(size.height) == view.height
     }
 
+    @MainActor
     func testLayoutBaseline() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/LayoutItemTests.swift b/Tests/LayoutTests/LayoutItemTests.swift
index 8bef21a6..4aee9a67 100644
--- a/Tests/LayoutTests/LayoutItemTests.swift
+++ b/Tests/LayoutTests/LayoutItemTests.swift
@@ -11,11 +11,11 @@ import Layout
 import Nimble
 import XCTest
 
-@MainActor
 final class LayoutItemTests: XCTestCase {
 
     // MARK: - Properties
 
+    @MainActor
     func testIdentifier() {
 
         // GIVEN
@@ -38,6 +38,7 @@ final class LayoutItemTests: XCTestCase {
 
     // MARK: - Identifier
 
+    @MainActor
     func testIDWithIdentifier() {
 
         // GIVEN
@@ -61,6 +62,7 @@ final class LayoutItemTests: XCTestCase {
 
     // MARK: - Size
 
+    @MainActor
     func testSizePriority() {
         assertLayout { view in
             view.layout {
@@ -83,6 +85,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testSizeWidthHeightPriority() {
         assertLayout { view in
             view.layout {
@@ -107,6 +110,7 @@ final class LayoutItemTests: XCTestCase {
 
     // MARK: - Width
 
+    @MainActor
     func testWidthIsRelationToConstantPriority() {
 
         // swiftlint:disable:next closure_body_length
@@ -169,6 +173,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testWidthWithConstantPriority() {
 
         assertLayout { view in
@@ -197,6 +202,7 @@ final class LayoutItemTests: XCTestCase {
 
     // MARK: - Height
 
+    @MainActor
     func testHeightIsRelationToConstantPriority() {
 
         // swiftlint:disable:next closure_body_length
@@ -259,6 +265,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testHeightWithConstantPriority() {
 
         assertLayout { view in
@@ -287,6 +294,7 @@ final class LayoutItemTests: XCTestCase {
 
     // MARK: - Square
 
+    @MainActor
     func testSquareWithLengthPriority() {
         assertLayout { view in
             view.layout {
@@ -309,6 +317,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testSquare() {
         assertLayout { view in
             view.layout {
@@ -333,6 +342,7 @@ final class LayoutItemTests: XCTestCase {
 
     // MARK: - Aspect Ratio
 
+    @MainActor
     func testAspectRatioWithRatioPriority() {
         assertLayout { view in
             view.layout {
@@ -359,6 +369,7 @@ final class LayoutItemTests: XCTestCase {
 
     // MARK: - Center
 
+    @MainActor
     func testCenterOffsetPriority() {
         assertLayout { view in
             view.layout {
@@ -387,6 +398,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testCenterWithAxisOffsetMultiplierPriority() {
         assertLayout { view in
             view.layout {
@@ -433,6 +445,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testCenterBetweenLeadingAndTrailing() {
         assertLayout(devices: Device.allTestDevices) { view in
             view.layout(
@@ -445,6 +458,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testCenterBetweenTopAndBottom() {
         assertLayout(devices: Device.allTestDevices) { view in
             view
@@ -460,6 +474,7 @@ final class LayoutItemTests: XCTestCase {
 
     // MARK: - Attributes
 
+    @MainActor
     func testToAttributeIsRelationMultiplierConstantPriority() {
         assertLayout { view in
             view.layout {
@@ -507,6 +522,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testToAttributeIsRelationMultiplierConstantPriority_givenRelation() {
         assertLayout { view in
             view.layout {
@@ -547,6 +563,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testToAttributesConstantPriority() {
         assertLayout { view in
             view.layout {
@@ -577,6 +594,7 @@ final class LayoutItemTests: XCTestCase {
 
     // MARK: - Edges
 
+    @MainActor
     func testToEdgesInsetsPriorityDirectional() {
         assertLayout { view in
             view.layout {
@@ -604,6 +622,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testToEdgesInsetsPriorityCanonical() {
         assertLayout { view in
             view.layout {
@@ -624,6 +643,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testToEdgesWithEdgesInsetPriorityDirectional() {
         assertLayout { view in
             view.layout {
@@ -653,6 +673,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testToEdgesCanonicalEdgesInsetPriority() {
         assertLayout { view in
             view.layout {
@@ -687,6 +708,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testToSideEdgesInsetPriority() {
         assertLayout { view in
             view.layout {
@@ -720,6 +742,7 @@ final class LayoutItemTests: XCTestCase {
 
     // MARK: - Margins
 
+    @MainActor
     func testToMargins_throwsAssertion() {
 
         // GIVEN
@@ -741,6 +764,7 @@ final class LayoutItemTests: XCTestCase {
         expect(item.superviewConstraints(item).count) == 4
     }
 
+    @MainActor
     func testToMarginsInsetsPriorityDirectional() {
         assertLayout(devices: Device.portraitTestDevices + Device.modernLandscapeTestDevices) { view in
             view.layout {
@@ -763,6 +787,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testToMarginsInsetsPriorityCanonical() {
         assertLayout(devices: Device.portraitTestDevices + Device.modernLandscapeTestDevices) { view in
             view.layout {
@@ -783,6 +808,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testToMarginsWithEdgesInsetPriorityDirectional() {
         assertLayout(devices: Device.portraitTestDevices + Device.modernLandscapeTestDevices) { view in
             view.layout {
@@ -808,6 +834,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testToMarginsCanonicalEdgesInsetPriority() {
         assertLayout(devices: Device.portraitTestDevices + Device.modernLandscapeTestDevices) { view in
             view.layout {
@@ -839,6 +866,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testToSideMarginsInsetPriority() {
         assertLayout(devices: Device.portraitTestDevices + Device.modernLandscapeTestDevices) { view in
             view.layout {
@@ -872,6 +900,7 @@ final class LayoutItemTests: XCTestCase {
 
     // MARK: - Safe Area
 
+    @MainActor
     func testToSafeArea_throwsAssertion() {
 
         // GIVEN
@@ -893,6 +922,7 @@ final class LayoutItemTests: XCTestCase {
         expect(item.superviewConstraints(item).count) == 4
     }
 
+    @MainActor
     func testToSafeAreaInsetsPriorityDirectional() {
         assertLayout(devices: Device.allTestDevices) { view in
             view.layout {
@@ -920,6 +950,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testToSafeAreaInsetsPriorityCanonical() {
         assertLayout(devices: Device.allTestDevices) { view in
             view.layout {
@@ -940,6 +971,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testToSafeAreaWithEdgesInsetPriorityDirectional() {
         assertLayout(devices: Device.allTestDevices) { view in
             view.layout {
@@ -960,6 +992,7 @@ final class LayoutItemTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testToSafeAreaCanonicalEdgesInsetPriority() {
         assertLayout(devices: Device.allTestDevices) { view in
             view.layout {
diff --git a/Tests/LayoutTests/LayoutTests.swift b/Tests/LayoutTests/LayoutTests.swift
index 8fb3381f..8d99849a 100644
--- a/Tests/LayoutTests/LayoutTests.swift
+++ b/Tests/LayoutTests/LayoutTests.swift
@@ -11,11 +11,11 @@
 import Nimble
 import XCTest
 
-@MainActor
 final class LayoutTests: XCTestCase {
 
     // MARK: - Initialization
 
+    @MainActor
     func testInitWithViewMetrics() {
 
         // GIVEN
@@ -47,6 +47,7 @@ final class LayoutTests: XCTestCase {
         expect(layout2.metrics["height"] as? Int) == 100
     }
 
+    @MainActor
     func testInitWithViewMetricsWithItem() {
 
         // GIVEN
@@ -88,6 +89,7 @@ final class LayoutTests: XCTestCase {
         expect(layoutTwo.items["subview2"]) === subview2
     }
 
+    @MainActor
     func testInitWithViewMetricsLayoutBuilderItems() {
 
         // GIVEN
@@ -118,6 +120,7 @@ final class LayoutTests: XCTestCase {
         expect(layout2.items["subview2"]) === subview2
     }
 
+    @MainActor
     func testInitWithViewMetricsItems() {
 
         // GIVEN
@@ -147,6 +150,7 @@ final class LayoutTests: XCTestCase {
 
     // MARK: - Adding Items
 
+    @MainActor
     func testAddItem() {
 
         // GIVEN
@@ -169,6 +173,7 @@ final class LayoutTests: XCTestCase {
         expect(layout.items["subview"]) === subview
     }
 
+    @MainActor
     func testAddItems() {
 
         // GIVEN
@@ -198,6 +203,7 @@ final class LayoutTests: XCTestCase {
 
     // MARK: - Adding Constraints
 
+    @MainActor
     func testAddingConstraintsBuilderConstraints() {
 
         // GIVEN
@@ -236,6 +242,7 @@ final class LayoutTests: XCTestCase {
         expect(layout.constraints) == [widthConstraint, heightConstraint]
     }
 
+    @MainActor
     func testAddingConstraints() {
 
         // GIVEN
@@ -265,6 +272,7 @@ final class LayoutTests: XCTestCase {
 
     // MARK: - Constrain
 
+    @MainActor
     func testConstrainViewAttributeIsRelationToTargetAttributeOfTargetViewMultiplierConstant() {
 
         // GIVEN
@@ -319,6 +327,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testConstrainAnchorIsRelationToTargetAnchorConstantPriority() {
 
         // GIVEN
@@ -420,6 +429,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testConstrainAnchorIsRelationToTargetAnchorMultiplierConstantPriority() {
 
         // GIVEN
@@ -489,6 +499,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testConstrainAnchorIsRelationToConstantPriority() {
 
         // GIVEN
@@ -534,6 +545,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testConstrainViewToTargetViewInset() {
 
         // GIVEN
@@ -565,6 +577,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testConstrainViewToTargetViewInsetsDirectional() {
 
         // GIVEN
@@ -588,6 +601,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testConstrainViewToTargetViewInsetsCanonical() {
 
         // GIVEN
@@ -613,6 +627,7 @@ final class LayoutTests: XCTestCase {
 
     // MARK: - Equal
 
+    @MainActor
     func testEqualAttributeWithViews() {
 
         // GIVEN
@@ -642,6 +657,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testEqualAttributesWithViews() {
 
         // GIVEN
@@ -664,6 +680,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testEqualAttributesWithViews_givenEmptyArray() {
 
         // GIVEN
@@ -698,6 +715,7 @@ final class LayoutTests: XCTestCase {
         expect(layout.constraints.count) == 1
     }
 
+    @MainActor
     func testEqualSizeWithViews() {
 
         // GIVEN
@@ -722,6 +740,7 @@ final class LayoutTests: XCTestCase {
 
     // MARK: - Center
 
+    @MainActor
     func testCenterViewBetweenLeadingAndTrailingPriority() {
 
         // GIVEN
@@ -756,6 +775,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testCenterViewBetweenLeadingAndTrailingPriority_givenNilSuperview() {
 
         // GIVEN
@@ -782,6 +802,7 @@ final class LayoutTests: XCTestCase {
         expect(layout.constraints.count) == 3
     }
 
+    @MainActor
     func testCenterViewBetweenTopAndBottomPriority() {
 
         // GIVEN
@@ -816,6 +837,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testCenterViewBetweenTopAndBottomPriority_givenNilSuperview() {
 
         // GIVEN
@@ -844,6 +866,7 @@ final class LayoutTests: XCTestCase {
 
     // MARK: - Stack
 
+    @MainActor
     func testHorizontalViewsSpacingDirectionPriorityAlignment() {
 
         // GIVEN
@@ -902,6 +925,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testHorizontalViewsSpacingDirectionPriorityAlignment_givenAlignment() {
 
         // GIVEN
@@ -935,6 +959,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testHorizontalViewsSpacingDirectionPriorityAlignment_givenEmptyArray() {
 
         // GIVEN
@@ -969,6 +994,7 @@ final class LayoutTests: XCTestCase {
         expect(layout.constraints.count) == 1
     }
 
+    @MainActor
     func testVerticalViewsSpacingPriorityAlignment() {
 
         // GIVEN
@@ -1009,6 +1035,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testVerticalViewsSpacingPriorityAlignment_givenAlignment() {
 
         // GIVEN
@@ -1037,6 +1064,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testVerticalViewsSpacingPriorityAlignment_givenEmptyArray() {
 
         // GIVEN
@@ -1073,6 +1101,7 @@ final class LayoutTests: XCTestCase {
 
     // MARK: - Visual Format Language
 
+    @MainActor
     func testHorizontalWithFormatMetricsOptions_givenDefaults() {
 
         // GIVEN
@@ -1099,6 +1128,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testHorizontalWithFormatMetricsOptions_givenOption() {
 
         // GIVEN
@@ -1139,6 +1169,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testVerticalWithFormatMetricsOptions_givenDefaults() {
 
         // GIVEN
@@ -1165,6 +1196,7 @@ final class LayoutTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testVerticalWithFormatMetricsOptions_givenOption() {
 
         // GIVEN
@@ -1207,6 +1239,7 @@ final class LayoutTests: XCTestCase {
 
     // MARK: - Activation
 
+    @MainActor
     func testActivateAndDeactivate() {
 
         // GIVEN
@@ -1264,6 +1297,7 @@ final class LayoutTests: XCTestCase {
 
     // MARK: - Priority
 
+    @MainActor
     func testRequire() {
 
         // GIVEN
@@ -1314,6 +1348,7 @@ final class LayoutTests: XCTestCase {
         expect(requiredLayout) === layout
     }
 
+    @MainActor
     func testWithPriority() {
 
         // GIVEN
@@ -1361,6 +1396,7 @@ final class LayoutTests: XCTestCase {
         expect(highPriorityLayout) === layout
     }
 
+    @MainActor
     func testPrioritizeWithPriority() {
 
         // GIVEN
@@ -1409,6 +1445,7 @@ final class LayoutTests: XCTestCase {
 
     // MARK: - Animation
 
+    @MainActor
     func testUpdate() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/Swift/ArrayTests.swift b/Tests/LayoutTests/Swift/ArrayTests.swift
index e0e5e676..8457ab79 100644
--- a/Tests/LayoutTests/Swift/ArrayTests.swift
+++ b/Tests/LayoutTests/Swift/ArrayTests.swift
@@ -11,11 +11,11 @@ import Layout
 import Nimble
 import XCTest
 
-@MainActor
 final class ArrayTests: XCTestCase {
 
     // MARK: - Activation
 
+    @MainActor
     func testActivateAndDeactivate() {
 
         // GIVEN
@@ -69,6 +69,7 @@ final class ArrayTests: XCTestCase {
 
     // MARK: - Priority
 
+    @MainActor
     func testRequire() {
 
         // GIVEN
@@ -107,6 +108,7 @@ final class ArrayTests: XCTestCase {
         expect(requiredConstraints) == constraints
     }
 
+    @MainActor
     func testWithPriority() {
 
         // GIVEN
@@ -148,6 +150,7 @@ final class ArrayTests: XCTestCase {
         expect(highPriorityConstraints) == constraints
     }
 
+    @MainActor
     func testPrioritizeWithPriority() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/Swift/CollectionTests.swift b/Tests/LayoutTests/Swift/CollectionTests.swift
index 7d615444..ed298c92 100644
--- a/Tests/LayoutTests/Swift/CollectionTests.swift
+++ b/Tests/LayoutTests/Swift/CollectionTests.swift
@@ -11,9 +11,9 @@
 import Nimble
 import XCTest
 
-@MainActor
 final class CollectionTests: XCTestCase {
 
+    @MainActor
     func testActivateAndDeactivate() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/UIKit/NSLayoutConstraintTests.swift b/Tests/LayoutTests/UIKit/NSLayoutConstraintTests.swift
index 7d6eddcd..afd4872a 100644
--- a/Tests/LayoutTests/UIKit/NSLayoutConstraintTests.swift
+++ b/Tests/LayoutTests/UIKit/NSLayoutConstraintTests.swift
@@ -11,11 +11,11 @@ import Layout
 import Nimble
 import XCTest
 
-@MainActor
 final class NSLayoutConstraintTests: XCTestCase {
 
     // MARK: - Visual Format Language
 
+    @MainActor
     func testConstraintsFormatsViewsMetricsOptions() {
 
         // GIVEN
@@ -45,6 +45,7 @@ final class NSLayoutConstraintTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testConstraintsFormatsViewsMetricsOptions_givenRightToLeftFormatOption() {
 
         // GIVEN
@@ -78,6 +79,7 @@ final class NSLayoutConstraintTests: XCTestCase {
 
     // MARK: - Activation
 
+    @MainActor
     func testActivateAndDeactivate() {
 
         // GIVEN
@@ -116,6 +118,7 @@ final class NSLayoutConstraintTests: XCTestCase {
 
     // MARK: - Priority
 
+    @MainActor
     func testRequire() {
 
         // GIVEN
@@ -133,6 +136,7 @@ final class NSLayoutConstraintTests: XCTestCase {
         expect(requiredConstraint) === constraint
     }
 
+    @MainActor
     func testWithPriority() {
 
         // GIVEN
@@ -153,6 +157,7 @@ final class NSLayoutConstraintTests: XCTestCase {
         expect(highPriorityConstraint) === constraint
     }
 
+    @MainActor
     func testPrioritizeWithPriority() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/UIKit/NSLayoutDimensionTests.swift b/Tests/LayoutTests/UIKit/NSLayoutDimensionTests.swift
index a93e168e..342dfccc 100644
--- a/Tests/LayoutTests/UIKit/NSLayoutDimensionTests.swift
+++ b/Tests/LayoutTests/UIKit/NSLayoutDimensionTests.swift
@@ -11,9 +11,9 @@ import Layout
 import Nimble
 import XCTest
 
-@MainActor
 final class NSLayoutDimensionTests: XCTestCase {
 
+    @MainActor
     func testConstraintIsRelationToAnchorMultiplierConstant_givenDefaults() {
 
         // GIVEN
@@ -35,6 +35,7 @@ final class NSLayoutDimensionTests: XCTestCase {
         expect(constraint).to(match(expected))
     }
 
+    @MainActor
     func testConstraintIsRelationToAnchorMultiplierConstant_givenMultiplier() {
 
         // GIVEN
@@ -56,6 +57,7 @@ final class NSLayoutDimensionTests: XCTestCase {
         expect(constraint).to(match(expected))
     }
 
+    @MainActor
     func testConstraintIsRelationToAnchorMultiplierConstant_givenConstant() {
 
         // GIVEN
@@ -77,6 +79,7 @@ final class NSLayoutDimensionTests: XCTestCase {
         expect(constraint).to(match(expected))
     }
 
+    @MainActor
     func testConstraintIsRelationToAnchorMultiplierConstant_givenGreaterThanOrEqualRelation() {
 
         // GIVEN
@@ -98,6 +101,7 @@ final class NSLayoutDimensionTests: XCTestCase {
         expect(constraint).to(match(expected))
     }
 
+    @MainActor
     func testConstraintIsRelationToAnchorMultiplierConstant_givenLessThanOrEqualRelation() {
 
         // GIVEN
@@ -119,6 +123,7 @@ final class NSLayoutDimensionTests: XCTestCase {
         expect(constraint).to(match(expected))
     }
 
+    @MainActor
     func testConstraintIsRelationToConstant_givenEqualRelation() {
 
         // GIVEN
@@ -139,6 +144,7 @@ final class NSLayoutDimensionTests: XCTestCase {
         expect(constraint).to(match(expected))
     }
 
+    @MainActor
     func testConstraintIsRelationConstant_givenGreaterThanRelation() {
 
         // GIVEN
@@ -159,6 +165,7 @@ final class NSLayoutDimensionTests: XCTestCase {
         expect(constraint).to(match(expected))
     }
 
+    @MainActor
     func testConstraintIsRelationConstant_givenLessThanRelation() {
 
         // GIVEN
@@ -179,6 +186,7 @@ final class NSLayoutDimensionTests: XCTestCase {
         expect(constraint).to(match(expected))
     }
 
+    @MainActor
     func testConstraintWithConstant() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/UIKit/NSLayoutXAxisAnchorTests.swift b/Tests/LayoutTests/UIKit/NSLayoutXAxisAnchorTests.swift
index 5a9216a1..b2f3326c 100644
--- a/Tests/LayoutTests/UIKit/NSLayoutXAxisAnchorTests.swift
+++ b/Tests/LayoutTests/UIKit/NSLayoutXAxisAnchorTests.swift
@@ -11,9 +11,9 @@ import Layout
 import Nimble
 import XCTest
 
-@MainActor
 final class NSLayoutXAxisAnchorTests: XCTestCase {
 
+    @MainActor
     func testConstraintIsRelationToAnchorConstant_givenDefaults() {
 
         // GIVEN
@@ -35,6 +35,7 @@ final class NSLayoutXAxisAnchorTests: XCTestCase {
         expect(constraint).to(match(expected))
     }
 
+    @MainActor
     func testConstraintIsRelationToAnchorConstant_givenConstant() {
 
         // GIVEN
@@ -56,6 +57,7 @@ final class NSLayoutXAxisAnchorTests: XCTestCase {
         expect(constraint).to(match(expected))
     }
 
+    @MainActor
     func testConstraintIsRelationToAnchorConstant_givenGreaterThanOrEqualRelation() {
 
         // GIVEN
@@ -77,6 +79,7 @@ final class NSLayoutXAxisAnchorTests: XCTestCase {
         expect(constraint).to(match(expected))
     }
 
+    @MainActor
     func testConstraintIsRelationToAnchorConstant_givenLessThanOrEqualRelation() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/UIKit/NSLayoutYAxisAnchorTests.swift b/Tests/LayoutTests/UIKit/NSLayoutYAxisAnchorTests.swift
index 74d93773..e6c7d462 100644
--- a/Tests/LayoutTests/UIKit/NSLayoutYAxisAnchorTests.swift
+++ b/Tests/LayoutTests/UIKit/NSLayoutYAxisAnchorTests.swift
@@ -11,9 +11,9 @@ import Layout
 import Nimble
 import XCTest
 
-@MainActor
 final class NSLayoutYAxisAnchorTests: XCTestCase {
 
+    @MainActor
     func testConstraintIsRelationToAnchorConstant_givenDefaults() {
 
         // GIVEN
@@ -35,6 +35,7 @@ final class NSLayoutYAxisAnchorTests: XCTestCase {
         expect(constraint).to(match(expected))
     }
 
+    @MainActor
     func testConstraintIsRelationToAnchorConstant_givenConstant() {
 
         // GIVEN
@@ -56,6 +57,7 @@ final class NSLayoutYAxisAnchorTests: XCTestCase {
         expect(constraint).to(match(expected))
     }
 
+    @MainActor
     func testConstraintIsRelationToAnchorConstant_givenGreaterThanOrEqualRelation() {
 
         // GIVEN
@@ -77,6 +79,7 @@ final class NSLayoutYAxisAnchorTests: XCTestCase {
         expect(constraint).to(match(expected))
     }
 
+    @MainActor
     func testConstraintIsRelationToAnchorConstant_givenLessThanOrEqualRelation() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/UIKit/UILayoutGuideTests.swift b/Tests/LayoutTests/UIKit/UILayoutGuideTests.swift
index 8d951bfe..426166f6 100644
--- a/Tests/LayoutTests/UIKit/UILayoutGuideTests.swift
+++ b/Tests/LayoutTests/UIKit/UILayoutGuideTests.swift
@@ -11,9 +11,9 @@ import Layout
 import Nimble
 import XCTest
 
-@MainActor
 final class UILayoutGuideTests: XCTestCase {
 
+    @MainActor
     func testLayoutBoundary() {
 
         // GIVEN
@@ -34,6 +34,7 @@ final class UILayoutGuideTests: XCTestCase {
         expect(boundary.bottom) == guide.bottomAnchor
     }
 
+    @MainActor
     func testLayoutCenter() {
 
         // GIVEN
@@ -50,6 +51,7 @@ final class UILayoutGuideTests: XCTestCase {
         expect(center.centerY) == guide.centerYAnchor
     }
 
+    @MainActor
     func testLayoutSize() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/UIKit/UIView+AutoLayoutTests.swift b/Tests/LayoutTests/UIKit/UIView+AutoLayoutTests.swift
index 9b50a7fb..dfa9f146 100644
--- a/Tests/LayoutTests/UIKit/UIView+AutoLayoutTests.swift
+++ b/Tests/LayoutTests/UIKit/UIView+AutoLayoutTests.swift
@@ -13,11 +13,11 @@ import Nimble
 import UIKit
 import XCTest
 
-@MainActor
 final class UIViewAutoLayoutTests: XCTestCase {
 
     // MARK: - Builder
 
+    @MainActor
     func testUsingConstraints() {
 
         // GIVEN
@@ -29,6 +29,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
         expect(view.translatesAutoresizingMaskIntoConstraints) == false
     }
 
+    @MainActor
     func testConstrainingSize_givenDefaults() {
 
         // GIVEN
@@ -64,6 +65,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
                                                                 constant: 20), isActive: true))
     }
 
+    @MainActor
     func testConstrainingSize() {
 
         // GIVEN
@@ -98,6 +100,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
                                                                 constant: 20), isActive: true))
     }
 
+    @MainActor
     func testConstrainingWidth_givenDefaults() {
 
         // GIVEN
@@ -125,6 +128,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
                                                                 constant: 10), isActive: true))
     }
 
+    @MainActor
     func testConstrainingWidth() {
 
         // GIVEN
@@ -152,6 +156,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
                                                                 constant: 10), isActive: true))
     }
 
+    @MainActor
     func testConstrainingHeight_givenDefaults() {
 
         // GIVEN
@@ -179,6 +184,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
                                                                 constant: 20), isActive: true))
     }
 
+    @MainActor
     func testConstrainingHeight() {
 
         // GIVEN
@@ -208,6 +214,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
 
     // MARK: - Size
 
+    @MainActor
     func testSizeConstraintsWithSize() {
 
         // GIVEN
@@ -259,6 +266,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
                                                                 constant: 40)))
     }
 
+    @MainActor
     func testSizeConstraintsWithWidthAndHeight() {
 
         // GIVEN
@@ -312,6 +320,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
 
     // MARK: - Width
 
+    @MainActor
     func testWidthConstraintIsRelationToConstant() {
 
         // GIVEN
@@ -361,6 +370,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
                                                              constant: 30)))
     }
 
+    @MainActor
     func testWidthConstraintWithConstant() {
 
         // GIVEN
@@ -398,6 +408,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
 
     // MARK: - Height
 
+    @MainActor
     func testHeightConstraintIsRelationToConstant() {
 
         // GIVEN
@@ -447,6 +458,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
                                                               constant: 60)))
     }
 
+    @MainActor
     func testHeightConstraintWithConstant() {
 
         // GIVEN
@@ -484,6 +496,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
 
     // MARK: - Square
 
+    @MainActor
     func testSquareConstraintsWithLength() {
 
         // GIVEN
@@ -513,6 +526,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
                                                                  constant: 100)))
     }
 
+    @MainActor
     func testSquareConstraint() {
 
         // GIVEN
@@ -536,6 +550,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
 
     // MARK: - Aspect Ratio
 
+    @MainActor
     func testAspectRatioConstraintWithRatio() {
 
         // GIVEN
@@ -559,6 +574,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
 
     // MARK: - Equal
 
+    @MainActor
     func testEqualConstraintsForAttributeToViews() {
 
         // GIVEN
@@ -592,6 +608,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
 
     // MARK: - Center
 
+    @MainActor
     func testCenterConstraintsOffset() {
 
         // GIVEN
@@ -647,6 +664,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
 
     // MARK: - Attributes
 
+    @MainActor
     func testConstraintForAttributeIsRelationToSuperviewMultiplierConstant() {
 
         // GIVEN
@@ -703,6 +721,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
                                                             constant: 5)))
     }
 
+    @MainActor
     func testConstraintForAttributeIsRelationToSuperviewMultiplierConstant_givenNilSuperview() {
 
         // GIVEN
@@ -723,6 +742,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
         expect(view.constraints(toSuperview: [.top, .left])).notTo(beEmpty())
     }
 
+    @MainActor
     func testConstraintForAttributeIsRelationToTargetAttributeOfTargetViewMultiplierConstant() {
 
         // GIVEN
@@ -781,6 +801,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
 
     // MARK: - Edges
 
+    @MainActor
     func testEdgeConstraintsInset() {
 
         // GIVEN
@@ -802,6 +823,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
         expect(constraints[3]).to(match(view.bottom.constraint(to: superview.bottom)))
     }
 
+    @MainActor
     func testEdgeConstraintsInset_givenInset() {
 
         // GIVEN
@@ -824,6 +846,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
         expect(constraints[3]).to(match(view.bottom.constraint(to: superview.bottom, constant: -inset)))
     }
 
+    @MainActor
     func testEdgeConstraintsInsetsDirectional() {
 
         // GIVEN
@@ -846,6 +869,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
         expect(constraints[3]).to(match(view.bottom.constraint(to: superview.bottom, constant: -insets.bottom)))
     }
 
+    @MainActor
     func testEdgeConstraintsInsetsCanonical() {
 
         // GIVEN
@@ -868,6 +892,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
         expect(constraints[3]).to(match(view.bottom.constraint(to: superview.bottom, constant: -insets.bottom)))
     }
 
+    @MainActor
     func testSideEdgeConstraintsInset() {
 
         // GIVEN
@@ -887,6 +912,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
         expect(constraints[1]).to(match(view.right.constraint(to: superview.right)))
     }
 
+    @MainActor
     func testSideEdgeConstraintsInset_givenInset() {
 
         // GIVEN
@@ -909,6 +935,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
 
     // MARK: - Margins
 
+    @MainActor
     func testMarginConstraintsInset() {
 
         // GIVEN
@@ -930,6 +957,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
         expect(constraints[3]).to(match(view.bottom.constraint(to: superview.margins.bottom)))
     }
 
+    @MainActor
     func testMarginConstraintsInset_givenInset() {
 
         // GIVEN
@@ -952,6 +980,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
         expect(constraints[3]).to(match(view.bottom.constraint(to: superview.margins.bottom, constant: -inset)))
     }
 
+    @MainActor
     func testMarginConstraintsInsetsDirectional() {
 
         // GIVEN
@@ -978,6 +1007,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
             .to(match(view.bottom.constraint(to: superview.margins.bottom, constant: -insets.bottom)))
     }
 
+    @MainActor
     func testMarginConstraintsInsetsCanonical() {
 
         // GIVEN
@@ -1000,6 +1030,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
         expect(constraints[3]).to(match(view.bottom.constraint(to: superview.margins.bottom, constant: -insets.bottom)))
     }
 
+    @MainActor
     func testSideMarginConstraintsInset() {
 
         // GIVEN
@@ -1019,6 +1050,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
         expect(constraints[1]).to(match(view.right.constraint(to: superview.margins.right)))
     }
 
+    @MainActor
     func testSideMarginConstraintsInset_givenInset() {
 
         // GIVEN
@@ -1041,6 +1073,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
 
     // MARK: - Safe Area
 
+    @MainActor
     func testSafeAreaConstraintsInset() {
 
         // GIVEN
@@ -1062,6 +1095,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
         expect(constraints[3]).to(match(view.bottom.constraint(to: superview.safeArea.bottom)))
     }
 
+    @MainActor
     func testSafeAreaConstraintsInset_givenInset() {
 
         // GIVEN
@@ -1084,6 +1118,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
         expect(constraints[3]).to(match(view.bottom.constraint(to: superview.safeArea.bottom, constant: -inset)))
     }
 
+    @MainActor
     func testSafeAreaConstraintsInsetsDirectional() {
 
         // GIVEN
@@ -1110,6 +1145,7 @@ final class UIViewAutoLayoutTests: XCTestCase {
             .to(match(view.bottom.constraint(to: superview.safeArea.bottom, constant: -insets.bottom)))
     }
 
+    @MainActor
     func testSafeAreaConstraintsInsetsCanonical() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/UIKit/UIView+FramesTests.swift b/Tests/LayoutTests/UIKit/UIView+FramesTests.swift
index b9a53e91..d388416e 100644
--- a/Tests/LayoutTests/UIKit/UIView+FramesTests.swift
+++ b/Tests/LayoutTests/UIKit/UIView+FramesTests.swift
@@ -12,9 +12,9 @@ import Layout
 import Nimble
 import XCTest
 
-@MainActor
 final class UIViewFramesTests: XCTestCase {
 
+    @MainActor
     func testUsingFramesWithAutoresizingMask() {
 
         // GIVEN
@@ -32,6 +32,7 @@ final class UIViewFramesTests: XCTestCase {
         expect(framedView) === view
     }
 
+    @MainActor
     func testDisablingIntrinsicSize() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/UIKit/UIView+LayoutTests.swift b/Tests/LayoutTests/UIKit/UIView+LayoutTests.swift
index acdbe578..6b5dad88 100644
--- a/Tests/LayoutTests/UIKit/UIView+LayoutTests.swift
+++ b/Tests/LayoutTests/UIKit/UIView+LayoutTests.swift
@@ -13,9 +13,9 @@ import Nimble
 import UIKit
 import XCTest
 
-@MainActor
 final class UIViewLayoutTests: XCTestCase {
 
+    @MainActor
     func testLayoutMetrics() {
 
         // GIVEN
@@ -35,6 +35,7 @@ final class UIViewLayoutTests: XCTestCase {
         expect(layout.items.isEmpty) == true
     }
 
+    @MainActor
     func testLayoutMetricsWithItem() {
 
         // GIVEN
@@ -57,6 +58,7 @@ final class UIViewLayoutTests: XCTestCase {
         expect(layout.items[identifier] as? UIView) == subview
     }
 
+    @MainActor
     func testLayoutMetricsWithItems() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/UIKit/UIView+NSLayoutAnchorTests.swift b/Tests/LayoutTests/UIKit/UIView+NSLayoutAnchorTests.swift
index 5f92e415..5ee549fd 100644
--- a/Tests/LayoutTests/UIKit/UIView+NSLayoutAnchorTests.swift
+++ b/Tests/LayoutTests/UIKit/UIView+NSLayoutAnchorTests.swift
@@ -13,9 +13,9 @@ import Nimble
 import UIKit
 import XCTest
 
-@MainActor
 final class UIViewNSLayoutAnchorTests: XCTestCase {
 
+    @MainActor
     func testAnchorForAxisAttributeXAxis() {
 
         // GIVEN
@@ -31,6 +31,7 @@ final class UIViewNSLayoutAnchorTests: XCTestCase {
         expect(view.anchor(for: .centerX)) == view.centerX
     }
 
+    @MainActor
     func testAnchorForAttributeYAxis() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/UIKit/UIViewControllerTests.swift b/Tests/LayoutTests/UIKit/UIViewControllerTests.swift
index f8bdb6da..48830228 100644
--- a/Tests/LayoutTests/UIKit/UIViewControllerTests.swift
+++ b/Tests/LayoutTests/UIKit/UIViewControllerTests.swift
@@ -11,9 +11,9 @@ import Layout
 import Nimble
 import XCTest
 
-@MainActor
 final class UIViewControllerTests: XCTestCase {
 
+    @MainActor
     func testSafeTopAndSafeBottom() {
 
         // GIVEN
diff --git a/Tests/LayoutTests/UIKit/UIViewUILayoutGuideTests.swift b/Tests/LayoutTests/UIKit/UIViewUILayoutGuideTests.swift
index d96ccd11..ffa876f0 100644
--- a/Tests/LayoutTests/UIKit/UIViewUILayoutGuideTests.swift
+++ b/Tests/LayoutTests/UIKit/UIViewUILayoutGuideTests.swift
@@ -11,14 +11,15 @@
 import Nimble
 import XCTest
 
-@MainActor
 final class UIViewUILayoutGuideTests: XCTestCase {
 
+    @MainActor
     func testMargins() {
         let view: UIView = .init()
         expect(view.margins) === view.layoutMarginsGuide
     }
 
+    @MainActor
     func testSafeArea() {
         let view: UIView = .init()
         expect(view.safeArea) === view.safeAreaLayoutGuide