1 files changed, 32 insertions, 0 deletions
diff --git a/actionpack/test/dispatch/system_testing/server_test.rb b/actionpack/test/dispatch/system_testing/server_test.rb
new file mode 100644
index 0000000000..95e411faf4
--- /dev/null
+++ b/actionpack/test/dispatch/system_testing/server_test.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+require "capybara/dsl"
+require "action_dispatch/system_testing/server"
+
+class ServerTest < ActiveSupport::TestCase
+  setup do
+    @old_capybara_server = Capybara.server
+  end
+
+  test "port is always included" do
+    ActionDispatch::SystemTesting::Server.new.run
+    assert Capybara.always_include_port, "expected Capybara.always_include_port to be true"
+  end
+
+  test "server is changed from `default` to `puma`" do
+    Capybara.server = :default
+    ActionDispatch::SystemTesting::Server.new.run
+    refute_equal Capybara.server, Capybara.servers[:default]
+  end
+
+  test "server is not changed to `puma` when is different than default" do
+    Capybara.server = :webrick
+    ActionDispatch::SystemTesting::Server.new.run
+    assert_equal Capybara.server, Capybara.servers[:webrick]
+  end
+
+  teardown do
+    Capybara.server = @old_capybara_server
+  end
+end