diff --git a/packages/core/jest.setup.ts b/packages/core/jest.setup.ts
index 82cadf289..d5efefb8f 100644
--- a/packages/core/jest.setup.ts
+++ b/packages/core/jest.setup.ts
@@ -83,6 +83,36 @@ global.CFRunLoopGetMain = function () {
 global.kCFRunLoopDefaultMode = 1;
 global.CFRunLoopPerformBlock = function (runloop, kCFRunLoopDefaultMode, func) {};
 global.CFRunLoopWakeUp = function (runloop) {};
+
+global.NativeScriptGlobals = {
+	events: {
+		on: (args) => {},
+		off: (args) => {},
+		notify: (args) => {},
+		hasListeners: (args) => {},
+	},
+};
+
+global.CADisplayLink = function () {};
+global.NSNotification = function () {};
+global.UIApplicationDelegate = function () {};
+global.UIResponder = function () {};
+global.UIResponder.extend = function () {};
+global.UIViewController = function () {};
+global.UIAdaptivePresentationControllerDelegate = function () {};
+global.UIPopoverPresentationControllerDelegate = function () {};
+global.UIContentSizeCategoryExtraSmall = 0.5;
+global.UIContentSizeCategorySmall = 0.7;
+global.UIContentSizeCategoryMedium = 0.85;
+global.UIContentSizeCategoryLarge = 1;
+global.UIContentSizeCategoryExtraLarge = 1.15;
+global.UIContentSizeCategoryExtraExtraLarge = 1.3;
+global.UIContentSizeCategoryExtraExtraExtraLarge = 1.5;
+global.UIContentSizeCategoryAccessibilityMedium = 2;
+global.UIContentSizeCategoryAccessibilityLarge = 2.5;
+global.UIContentSizeCategoryAccessibilityExtraLarge = 3;
+global.UIContentSizeCategoryAccessibilityExtraExtraLarge = 3.5;
+global.UIContentSizeCategoryAccessibilityExtraExtraExtraLarge = 4;
 // global.UIDocumentInteractionController = {
 // 	interactionControllerWithURL(url: any) {
 // 		return null;
diff --git a/packages/core/ui/transition/shared-transition.spec.ts b/packages/core/ui/transition/shared-transition.spec.ts
new file mode 100644
index 000000000..b91d664bb
--- /dev/null
+++ b/packages/core/ui/transition/shared-transition.spec.ts
@@ -0,0 +1,73 @@
+import { SharedTransition, SharedTransitionAnimationType } from './shared-transition';
+
+describe('SharedTransition', () => {
+	it('custom should create a Transition instance', () => {
+		const transition = SharedTransition.custom(new CustomTransition());
+		expect(transition.instance.id).toBe(1);
+	});
+	it('custom should create a Transition with default state and options', () => {
+		const transition = SharedTransition.custom(new CustomTransition());
+		const state = SharedTransition.getState(transition.instance.id);
+		expect(state.activeType).toBe(SharedTransitionAnimationType.present);
+		expect(state.pageStart).toBeUndefined();
+		expect(state.pageEnd).toBeUndefined();
+		expect(state.pageReturn).toBeUndefined();
+		expect(state.interactive).toBeUndefined();
+	});
+	it('custom should create a Transition with custom options', () => {
+		const transition = SharedTransition.custom(new CustomTransition(), {
+			interactive: {
+				dismiss: {
+					finishThreshold: 0.6,
+					percentFormula: (args) => {
+						return args.deltaX - 0.2;
+					},
+				},
+			},
+			pageStart: {
+				x: 200,
+				y: 100,
+				spring: {
+					friction: 40,
+				},
+			},
+			pageEnd: {
+				x: 0,
+				y: 0,
+			},
+			pageReturn: {
+				x: -200,
+				y: -100,
+				width: 25,
+			},
+		});
+		const state = SharedTransition.getState(transition.instance.id);
+		expect(state.activeType).toBe(SharedTransitionAnimationType.present);
+		expect(state.interactive.dismiss.finishThreshold).toBe(0.6);
+		expect(state.interactive.dismiss.percentFormula({ deltaX: 0.9, deltaY: 0, state: 0, android: null, eventName: 'pan', ios: null, object: null, type: 3, view: null })).toBe(0.7);
+		expect(state.pageStart.x).toBe(200);
+		expect(state.pageStart.y).toBe(100);
+		expect(state.pageStart.spring.friction).toBe(40);
+		expect(state.pageEnd.x).toBe(0);
+		expect(state.pageEnd.y).toBe(0);
+		expect(state.pageReturn.x).toBe(-200);
+		expect(state.pageReturn.y).toBe(-100);
+		expect(state.pageReturn.width).toBe(25);
+	});
+});
+
+class CustomTransition {
+	id: number;
+	constructor() {
+		this.id = 1;
+	}
+
+	getDuration() {
+		return 0.35;
+	}
+
+	setDuration(value: number) {}
+	getCurve() {}
+	animateIOSTransition() {}
+	createAndroidAnimator() {}
+}