참고소스 수정본

참고/playwright-main/examples/mock-battery/tests/show-battery-status.spec.js

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+// @ts-check
+const { test, expect } = require('@playwright/test');
+
+test.beforeEach(async ({ page }) => {
+  await page.addInitScript(() => {
+    const mockBattery = {
+      level: 0.90,
+      charging: true,
+      chargingTime: 1800, // seconds
+      dischargingTime: Infinity,
+      addEventListener: () => { }
+    };
+    // application tries navigator.battery first
+    // so we delete this method
+    delete window.navigator.battery;
+    // Override the method to always return mock battery info.
+    window.navigator.getBattery = async () => mockBattery;
+  });
+});
+
+test('show battery status', async ({ page }) => {
+  await page.goto('/');
+  await expect(page.locator('.battery-percentage')).toHaveText('90%');
+  await expect(page.locator('.battery-status')).toHaveText('Adapter');
+  await expect(page.locator('.battery-fully')).toHaveText('00:30');
+})