ci: fix CLI-from-git setup in test.yml (PER-9772)

.github/workflows/test.yml

@@ -51,16 +51,25 @@ jobs:
       - run: yarn
       - name: Set up @percy/cli from git
         if: ${{ github.event_name == 'workflow_dispatch' }}
+        env:
+          BRANCH: ${{ github.event.inputs.branch }}
         run: |
           cd /tmp
-          git clone --branch ${{ github.event.inputs.branch }} --depth 1 https://github.com/percy/cli
+          git clone --branch "$BRANCH" --depth 1 https://github.com/percy/cli
           cd cli
           PERCY_PACKAGES=`find packages -mindepth 1 -maxdepth 1 -type d | sed -e 's/packages/@percy/g' | tr '\n' ' '`
           git log -1
           yarn
           yarn build
           yarn global:link
-          cd ${{ github.workspace }} 
-          yarn remove @percy/cli && yarn link `echo $PERCY_PACKAGES`
-          npx percy --version
+          # Expose the freshly built `percy` on PATH. yarn link symlinks the
+          # package but not its bin, so `npx percy` would miss it and download
+          # the unrelated public `percy`. Link is best-effort; PATH is what
+          # makes percy resolvable.
+          echo "$(yarn global bin)" >> "$GITHUB_PATH"
+          export PATH="$(yarn global bin):$PATH"
+          cd ${{ github.workspace }}
+          yarn remove @percy/cli >/dev/null 2>&1 || true
+          yarn link `echo $PERCY_PACKAGES` >/dev/null 2>&1 || true
+          percy --version
       - run: npx percy exec --testing -- bundle exec rspec

spec/spec_helper.rb

@@ -38,6 +38,16 @@
   Capybara.default_driver = :selenium_headless
   Capybara.javascript_driver = :selenium_headless
 
+  # Capybara's built-in :selenium_headless driver still passes `options:` to
+  # driver init, which newer selenium-webdriver logs as a [DEPRECATION]
+  # [:browser_options] warning on first use. The suite asserts exact stdout
+  # via `output(...).to_stdout`, so any example that first boots the driver
+  # inside such a block fails on that extra line (seed-dependent). Silence
+  # just that deprecation id.
+  if Selenium::WebDriver.logger.respond_to?(:ignore)
+    Selenium::WebDriver.logger.ignore(:browser_options)
+  end
+
   # Setup for Capybara to test Jekyll static files served by Rack
   Capybara.server_port = 3003
   Capybara.server = :puma, { Silent: true }