/**
 * Component tests for BurndownChart.
 * Validates rendering with burndown data points.
 */
import { describe, it, expect } from 'vitest';
import { mount } from '@vue/test-utils';
import BurndownChart from '@/components/charts/BurndownChart.vue';

const mockBurndown = [
  { date: '2026-04-01', ideal: 100, actual: 100 },
  { date: '2026-04-03', ideal: 80, actual: 85 },
  { date: '2026-04-05', ideal: 60, actual: 70 },
  { date: '2026-04-07', ideal: 40, actual: 55 },
  { date: '2026-04-09', ideal: 20, actual: 35 },
  { date: '2026-04-11', ideal: 0, actual: 10 },
];

describe('BurndownChart', () => {
  it('should mount with burndown data', () => {
    const wrapper = mount(BurndownChart, {
      props: { burndown: mockBurndown, sprintName: 'Sprint 5' },
    });
    expect(wrapper.exists()).toBe(true);
  });

  it('should have chart container', () => {
    const wrapper = mount(BurndownChart, {
      props: { burndown: mockBurndown },
    });
    expect(wrapper.find('.burndown-chart').exists()).toBe(true);
  });

  it('should handle empty burndown gracefully', () => {
    const wrapper = mount(BurndownChart, {
      props: { burndown: [] },
    });
    expect(wrapper.exists()).toBe(true);
  });

  it('should handle single data point', () => {
    const wrapper = mount(BurndownChart, {
      props: { burndown: [{ date: '2026-04-01', ideal: 50, actual: 50 }] },
    });
    expect(wrapper.exists()).toBe(true);
  });
});