From 2247ffd79b226a7fe00dd3252020becf2c22b110 Mon Sep 17 00:00:00 2001
From: Matt Schile <mschile@cypress.io>
Date: Tue, 19 Sep 2023 09:37:01 -0600
Subject: [PATCH] test: add new system test for --headless=old (#27834)

---
 .../projects/e2e/cypress/e2e/headless_old.cy.js     |  5 +++++
 system-tests/projects/e2e/cypress/plugins/index.js  | 11 +++++++++++
 system-tests/test/headless_old_spec.js              | 13 +++++++++++++
 3 files changed, 29 insertions(+)
 create mode 100644 system-tests/projects/e2e/cypress/e2e/headless_old.cy.js
 create mode 100644 system-tests/test/headless_old_spec.js

diff --git a/system-tests/projects/e2e/cypress/e2e/headless_old.cy.js b/system-tests/projects/e2e/cypress/e2e/headless_old.cy.js
new file mode 100644
index 000000000000..f9458e537ee8
--- /dev/null
+++ b/system-tests/projects/e2e/cypress/e2e/headless_old.cy.js
@@ -0,0 +1,5 @@
+describe('e2e headless old spec', function () {
+  it('has expected launch args', function () {
+    cy.task('get:browser:args').should('contain', '--headless=old')
+  })
+})
diff --git a/system-tests/projects/e2e/cypress/plugins/index.js b/system-tests/projects/e2e/cypress/plugins/index.js
index 827a05a6c382..0436a606c833 100644
--- a/system-tests/projects/e2e/cypress/plugins/index.js
+++ b/system-tests/projects/e2e/cypress/plugins/index.js
@@ -59,6 +59,17 @@ module.exports = (on, config) => {
     }
 
     if (browser.family === 'chromium' && browser.name !== 'electron') {
+      if (process.env.CHROMIUM_USE_HEADLESS_OLD) {
+        options.args = options.args.map((arg) => {
+          // ensure we are using --headless=old by overriding both headless new and default
+          if (arg === '--headless' || arg === '--headless=new') {
+            return '--headless=old'
+          }
+
+          return arg
+        })
+      }
+
       if (process.env.CHROMIUM_EXTRA_LAUNCH_ARGS) {
         options.args = options.args.concat(process.env.CHROMIUM_EXTRA_LAUNCH_ARGS.split(' '))
       }
diff --git a/system-tests/test/headless_old_spec.js b/system-tests/test/headless_old_spec.js
new file mode 100644
index 000000000000..feeffc08cae2
--- /dev/null
+++ b/system-tests/test/headless_old_spec.js
@@ -0,0 +1,13 @@
+const systemTests = require('../lib/system-tests').default
+
+describe('e2e', () => {
+  systemTests.setup()
+
+  systemTests.it('succeeds using --headless=old', {
+    spec: 'headless_old.cy.js',
+    browser: 'chrome',
+    processEnv: {
+      CHROMIUM_USE_HEADLESS_OLD: 1,
+    },
+  })
+})