test(download): ensure HTTP_PROXY is unused (#37645)

tests/installation/playwright-cli-install-should-work.spec.ts

@@ -61,7 +61,7 @@ test('install command should work', async ({ exec, checkInstalledSoftwareOnDisk
   }
 });
 
-test('install command should work with proxy', { annotation: { type: 'issue', description: 'https://github.com/microsoft/playwright/issues/36650' } }, async ({ exec, checkInstalledSoftwareOnDisk }) => {
+test('install command should work with HTTPS_PROXY', { annotation: { type: 'issue', description: 'https://github.com/microsoft/playwright/issues/36650' } }, async ({ exec, checkInstalledSoftwareOnDisk }) => {
   await exec('npm i playwright');
   const proxy = await TestProxy.create(8947 + test.info().workerIndex * 4);
   proxy.forwardTo(443, { preserveHostname: true });
@@ -77,6 +77,19 @@ test('install command should work with proxy', { annotation: { type: 'issue', de
   await proxy.stop();
 });
 
+test('install command should ignore HTTP_PROXY', { annotation: { type: 'issue', description: 'https://github.com/microsoft/playwright/issues/36412' } }, async ({ exec, checkInstalledSoftwareOnDisk }) => {
+  await exec('npm i playwright');
+  await test.step('playwright install chromium', async () => {
+    const result = await exec('npx playwright install chromium', {
+      env: {
+        HTTP_PROXY: 'unused',
+      },
+    });
+    expect(result).toHaveLoggedSoftwareDownload(['chromium', 'chromium-headless-shell', 'ffmpeg', ...extraInstalledSoftware]);
+    await checkInstalledSoftwareOnDisk(['chromium', 'chromium-headless-shell', 'ffmpeg', ...extraInstalledSoftware]);
+  });
+});
+
 test('should be able to remove browsers', async ({ exec, checkInstalledSoftwareOnDisk }) => {
   await exec('npm i playwright');
   await exec('npx playwright install chromium');