diff --git a/apps/ui-storybook-e2e/src/integration/accordion/accordion.cy.ts b/apps/ui-storybook-e2e/src/integration/accordion/accordion.cy.ts
new file mode 100644
index 000000000..5b6800668
--- /dev/null
+++ b/apps/ui-storybook-e2e/src/integration/accordion/accordion.cy.ts
@@ -0,0 +1,110 @@
+describe('accordion', () => {
+	const verifyAccordionSetup = () => {
+		cy.get('brn-accordion').should('have.attr', 'data-state', 'closed');
+		cy.get('brn-accordion-item').should('have.length', 3);
+		cy.get('brn-accordion-item').first().as('firstItem');
+		cy.get('@firstItem').next().as('secondItem');
+		cy.get('@secondItem').next().as('thirdItem');
+
+		cy.get('@firstItem').should('have.attr', 'data-state', 'closed');
+		cy.get('@secondItem').should('have.attr', 'data-state', 'closed');
+		cy.get('@thirdItem').should('have.attr', 'data-state', 'closed');
+
+		cy.get('@firstItem')
+			.find('brn-accordion-trigger')
+			.should('have.attr', 'role', 'heading')
+			.should('have.id', 'brn-accordion-trigger-0')
+			.should('have.attr', 'data-state', 'closed')
+			.should('have.attr', 'aria-expanded', 'false');
+		cy.get('@firstItem')
+			.find('brn-accordion-content')
+			.should('have.attr', 'role', 'region')
+			.should('have.id', 'brn-accordion-content-0')
+			.should('have.attr', 'data-state', 'closed');
+	};
+
+	const verifyAccordionStateOpen = () => {
+		cy.get('brn-accordion').should('have.attr', 'data-state', 'open');
+	};
+
+	const verifyAccordionStateClosed = () => {
+		cy.get('brn-accordion').should('have.attr', 'data-state', 'closed');
+	};
+
+	const verifyAccordionFirstItemStateOpen = () => {
+		cy.get('@firstItem').should('have.attr', 'data-state', 'open');
+		cy.get('@firstItem')
+			.find('brn-accordion-trigger')
+			.should('have.attr', 'data-state', 'open')
+			.should('have.attr', 'aria-expanded', 'true');
+		cy.get('@firstItem').find('brn-accordion-content').should('have.attr', 'data-state', 'open');
+	};
+
+	const verifyAccordionFirstItemStateClosed = () => {
+		cy.get('@firstItem').should('have.attr', 'data-state', 'closed');
+		cy.get('@firstItem')
+			.find('brn-accordion-trigger')
+			.should('have.attr', 'data-state', 'closed')
+			.should('have.attr', 'aria-expanded', 'false');
+		cy.get('@firstItem').find('brn-accordion-content').should('have.attr', 'data-state', 'closed');
+	};
+
+	const verifyAccordionSecondItemStateOpen = () => {
+		cy.get('@secondItem').should('have.attr', 'data-state', 'open');
+		cy.get('@secondItem')
+			.find('brn-accordion-trigger')
+			.should('have.attr', 'data-state', 'open')
+			.should('have.attr', 'aria-expanded', 'true');
+		cy.get('@secondItem').find('brn-accordion-content').should('have.attr', 'data-state', 'open');
+	};
+
+	const verifyAccordionSecondItemStateClosed = () => {
+		cy.get('@secondItem').should('have.attr', 'data-state', 'closed');
+		cy.get('@secondItem')
+			.find('brn-accordion-trigger')
+			.should('have.attr', 'data-state', 'closed')
+			.should('have.attr', 'aria-expanded', 'false');
+		cy.get('@secondItem').find('brn-accordion-content').should('have.attr', 'data-state', 'closed');
+	};
+
+	describe('default', () => {
+		beforeEach(() => {
+			cy.visit('/iframe.html?id=accordion--default');
+			cy.injectAxe();
+		});
+
+		it('click on trigger should open and close it content', () => {
+			verifyAccordionSetup();
+
+			// click trigger first item to open it content
+			cy.get('@firstItem').find('brn-accordion-trigger').click();
+			verifyAccordionStateOpen();
+			verifyAccordionFirstItemStateOpen();
+
+			// click trigger first item to close it content
+			cy.get('@firstItem').find('brn-accordion-trigger').click();
+			verifyAccordionStateClosed();
+			verifyAccordionFirstItemStateClosed();
+		});
+
+		it('click on trigger should open it content and click on another trigger should closed previous content and open newly triggered content', () => {
+			verifyAccordionSetup();
+
+			// click trigger first item to open it content
+			cy.get('@firstItem').find('brn-accordion-trigger').click();
+			verifyAccordionStateOpen();
+			verifyAccordionFirstItemStateOpen();
+
+			// click trigger second item to open it content and close previous content
+			cy.get('@secondItem').find('brn-accordion-trigger').click();
+			verifyAccordionStateOpen();
+			verifyAccordionSecondItemStateOpen();
+			verifyAccordionFirstItemStateClosed();
+
+			// click trigger second item to close it content
+			cy.get('@secondItem').find('brn-accordion-trigger').click();
+			verifyAccordionStateClosed();
+			verifyAccordionSecondItemStateClosed();
+		});
+	});
+});
diff --git a/libs/ui/accordion/brain/src/lib/brn-accordion.component.ts b/libs/ui/accordion/brain/src/lib/brn-accordion.component.ts
index b799458ce..2b44486df 100644
--- a/libs/ui/accordion/brain/src/lib/brn-accordion.component.ts
+++ b/libs/ui/accordion/brain/src/lib/brn-accordion.component.ts
@@ -51,7 +51,7 @@ export class BrnAccordionComponent implements AfterContentInit {
 
 	public toggleItem(id: number) {
 		if (this._openItemIds().includes(id)) {
-			this._openItemIds.update((ids) => ids.filter((openId) => id == openId));
+			this._openItemIds.update((ids) => ids.filter((openId) => id !== openId));
 			return;
 		} else if (this.type === 'single') {
 			this._openItemIds.set([]);