Add expense creation to E2E tests using Page Object Model

tests/pom/expense-page.ts

@@ -0,0 +1,31 @@
+import { Page } from '@playwright/test'
+
+export class ExpensePage {
+  constructor(private page: Page) {}
+
+  async navigateToGroupExpenses(groupId: string) {
+    await this.page.goto(`http://localhost:3002/groups/${groupId}/expenses`)
+  }
+
+  async fillTitle(expenseTitle: string) {
+    await this.page
+      .getByRole('textbox', { name: 'Expense title' })
+      .fill(expenseTitle)
+  }
+
+  async fillAmount(expenseAmount: string) {
+    await this.page.getByRole('textbox', { name: 'Amount' }).fill(expenseAmount)
+  }
+
+  async selectPayer(payer: string) {
+    await this.page
+      .getByRole('combobox')
+      .filter({ hasText: 'Select a participant' })
+      .click()
+    await this.page.getByRole('option', { name: payer, exact: true }).click()
+  }
+
+  async submit() {
+    await this.page.getByRole('button', { name: 'Create' }).click()
+  }
+}