Guard remote session ID test

rb/spec/integration/selenium/webdriver/firefox/driver_spec.rb

@@ -33,8 +33,6 @@ module WebDriver
           expect(caps.implicit_timeout).to be_zero
           expect(caps.page_load_timeout).to be == 300000
           expect(caps.script_timeout).to be == 30000
-
-          expect(caps.remote_session_id).not_to be_nil if GlobalTestEnv.driver == :remote
         end
       end
 
@@ -54,6 +52,12 @@ module WebDriver
         end
       end
 
+      it 'has remote session ID', only: {driver: :remote}, except: {browser: :ff_esr} do
+        create_driver! do |driver|
+          expect(driver.capabilities.remote_session_id).to be
+        end
+      end
+
       it 'takes a binary path as an argument', only: {driver: :firefox} do
         skip "Set ENV['ALT_FIREFOX_BINARY'] to test this" unless ENV['ALT_FIREFOX_BINARY']