Add spec that tests default command

Author: bradgessler

spec/integration/rails_spec.rb

@@ -38,7 +38,6 @@ def console(&)
   end
 
   it "logs in successfully" do
-    shell = "docker exec -it #{@docker_id} bash"
     console do
       it.puts "#{BINARY_NAME} login"
       it.expect "Email: "
@@ -59,6 +58,13 @@ def console(&)
     end
   end
 
+  it "runs default task with no arguments" do
+    console do
+      it.puts "#{BINARY_NAME}"
+      expect(it.expect("Commands:")).to include("Commands:")
+    end
+  end
+
   private
 
   def wait_for_server_in_container(timeout:)