test(components): add component tests, use ts for e2e tests

examples/nextjs/cypress/e2e/draghandle.cy.ts

@@ -0,0 +1,32 @@
+describe('DragHandle Flow Rendering', () => {
+  before(() => {
+    cy.visit('/DragHandle');
+  });
+
+  it('renders a flow with a node', () => {
+    cy.get('.react-flow__renderer');
+    cy.get('.react-flow__node').should('have.length', 1);
+  });
+
+  it('tries to drag a node', () => {
+    const $nodeElement = Cypress.$('.react-flow__node:first');
+    const styleBeforeDrag = $nodeElement.css('transform');
+
+    cy.drag('.react-flow__node:first', { x: 500, y: 500 }).then(() => {
+      const styleAfterDrag = $nodeElement.css('transform');
+      expect(styleBeforeDrag).to.be.equal(styleAfterDrag);
+    });
+  });
+
+  it('drags a node', () => {
+    const $nodeElement = Cypress.$('.react-flow__node:first');
+    const styleBeforeDrag = $nodeElement.css('transform');
+
+    cy.drag('.custom-drag-handle:first', { x: 500, y: 500 }).then(() => {
+      const styleAfterDrag = $nodeElement.css('transform');
+      expect(styleBeforeDrag).to.not.equal(styleAfterDrag);
+    });
+  });
+});
+
+export {};