fix spec regression with capybara/selenium downloads

spec/rails_helper.rb

@@ -12,15 +12,14 @@
 require "fileutils"
 require "vcr"
 
-# Automatically downloads chromedriver, which is used use for JS feature specs
-# require "webdrivers/chromedriver"
-
 Capybara.register_driver(:selenium_chrome_headless) do |app|
   options = Selenium::WebDriver::Chrome::Options.new(
     args: %w[disable-gpu no-sandbox mute-audio] + (ENV["HEADED"] ? [] : ["headless"]),
     "goog:loggingPrefs" => {browser: "ALL", client: "ALL", driver: "ALL", server: "ALL"}
   )
 
+  options.add_preference(:download, default_directory: Capybara.save_path.to_s)
+
   Capybara::Selenium::Driver.new(app, browser: :chrome, options: options).tap do |driver|
     driver.browser.manage.window.size = Selenium::WebDriver::Dimension.new(1280, 2048)
   end
@@ -80,6 +79,17 @@
     FileUtils.mkdir_p(Rails.root.join("tmp"))
   end
 
+  # Make sure we have a downloads directory for the browser.
+  config.before(:suite) do
+    Capybara.save_path = Rails.root.join("tmp/downloads")
+    FileUtils.mkdir_p(Capybara.save_path)
+  end
+
+  # Clean up downloads directory.
+  config.after(:suite) do
+    FileUtils.rm_rf(Capybara.save_path)
+  end
+
   # Set up system tests
   config.before(:each, type: :system) do
     driven_by(:rack_test)

spec/system/forms/option_set/option_sets_spec.rb

@@ -64,7 +64,7 @@
 
     click_on("Export")
     sleep(1) # CI takes time to download and save the file.
-    export = CSV.open("Foo.csv").read
+    export = CSV.open("#{Capybara.save_path}/Foo.csv").read
     expect(export[0][0]).to eq("Id")
     expect(export[1][1]).to eq("Banana")
   end