diff --git a/test/pseudo-window.body.spec.js b/test/pseudo-window.body.spec.js
index 9815b55..8e905c2 100644
--- a/test/pseudo-window.body.spec.js
+++ b/test/pseudo-window.body.spec.js
@@ -1,7 +1,50 @@
 import { mount } from '@vue/test-utils';
 import PseudoWindow from 'vue-pseudo-window';
 
+describe('Events', () => {
+	it('should catch "click" on body', () => {
+		const clickHandler = jest.fn();
+		mount({
+			template: `
+				<div>
+					<pseudo-window
+						body
+						@click="clickHandler"
+					/>
+				</div>
+			`,
+			components: {
+				PseudoWindow,
+			},
+			methods: {
+				clickHandler,
+			},
+		}, {
+			attachToDocument: true,
+		});
+
+		global.window.document.body.dispatchEvent(new Event('click'));
+		expect(clickHandler).toHaveBeenCalled();
+	});
+});
+
 describe('Class', () => {
+	it('invalid', async () => {
+		mount({
+			template: `
+				<pseudo-window
+					class="static-class"
+				/>
+			`,
+			components: {
+				PseudoWindow,
+			},
+		});
+
+		const { classList } = global.window.document.body;
+		expect(classList.contains('static-class')).toBe(false);
+	});
+
 	it('static class', async () => {
 		const wrapper = mount({
 			template: `
@@ -89,4 +132,28 @@ describe('Class', () => {
 
 		expect(classList.contains('reactive-class')).toBe(false);
 	});
+
+
+	it('work with existing class', async () => {
+		const { classList } = global.window.document.body;
+		classList.add('should-remain');
+
+		const wrapper = mount({
+			template: `
+				<pseudo-window
+					body
+					class="static-class"
+				/>
+			`,
+			components: {
+				PseudoWindow,
+			},
+		});
+
+		expect(classList.contains('static-class')).toBe(true);
+
+		wrapper.destroy();
+
+		expect(classList.contains('should-remain')).toBe(true);
+	});
 });
diff --git a/test/pseudo-window.spec.js b/test/pseudo-window.spec.js
index 06726ff..811fb65 100644
--- a/test/pseudo-window.spec.js
+++ b/test/pseudo-window.spec.js
@@ -242,30 +242,3 @@ describe('Document', () => {
 		expect(clickHandler.mock.calls.length).toBe(3);
 	});
 });
-
-describe('Body', () => {
-	it('should catch "click" on body', () => {
-		const clickHandler = jest.fn();
-		mount({
-			template: `
-				<div>
-					<pseudo-window
-						body
-						@click="clickHandler"
-					/>
-				</div>
-			`,
-			components: {
-				PseudoWindow,
-			},
-			methods: {
-				clickHandler,
-			},
-		}, {
-			attachToDocument: true,
-		});
-
-		global.window.document.body.dispatchEvent(new Event('click'));
-		expect(clickHandler).toHaveBeenCalled();
-	});
-});