Add tests

src/chronology/ui/Kings/Kings.test.tsx

@@ -0,0 +1,62 @@
+import React from 'react'
+import { render, screen } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { getKingsByDynasty, findKingByOrderGlobal, KingField } from './Kings'
+
+describe('getKingsByDynasty', () => {
+  it('returns kings from the specified dynasty', () => {
+    const result = getKingsByDynasty('Dynasty of Akkad')
+    expect(result).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({ dynastyName: 'Dynasty of Akkad' }),
+      ])
+    )
+  })
+
+  it('returns an empty array for a dynasty that does not exist', () => {
+    const result = getKingsByDynasty('Nonexistent Dynasty')
+    expect(result).toHaveLength(0)
+  })
+})
+
+describe('findKingByOrderGlobal', () => {
+  it('finds and returns the king with the specified orderGlobal', () => {
+    const result = findKingByOrderGlobal(1)
+    expect(result).toEqual(expect.objectContaining({ name: 'Sargon' }))
+  })
+
+  it('returns null if no king with the specified orderGlobal exists', () => {
+    const result = findKingByOrderGlobal(999)
+    expect(result).toBeNull()
+  })
+})
+
+describe('KingField Component', () => {
+  it('renders without crashing', () => {
+    // eslint-disable-next-line @typescript-eslint/no-empty-function
+    render(<KingField setKing={() => {}} />)
+    expect(screen.getByLabelText(/select-king/i)).toBeInTheDocument()
+  })
+
+  it('updates the king selection', async () => {
+    const setKing = jest.fn()
+    render(<KingField setKing={setKing} />)
+    const selectInput = screen.getByLabelText(/select-king/i)
+    await userEvent.type(selectInput, 'Sargon', { skipClick: true })
+    await userEvent.keyboard('{arrowdown}')
+    await userEvent.keyboard('{enter}')
+
+    expect(setKing).toHaveBeenCalledWith(
+      expect.objectContaining({
+        date: '709–705',
+        dynastyName: 'Miscellaneous Dynasties',
+        dynastyNumber: '12',
+        name: 'Sargon II',
+        notes: '',
+        orderGlobal: 147,
+        orderInDynasty: '22',
+        totalOfYears: '5',
+      })
+    )
+  })
+})