service(systemd): launch_only_once test

Library/Homebrew/test/service_spec.rb

@@ -291,10 +291,11 @@ describe Homebrew::Service do
       expect(unit).to eq(unit_expect.strip)
     end
 
-    it "returns valid partial unit" do
+    it "returns valid partial oneshot unit" do
       f.class.service do
         run opt_bin/"beanstalkd"
         run_type :immediate
+        launch_only_once true
       end
 
       unit = f.service.to_systemd_unit
@@ -306,10 +307,10 @@ describe Homebrew::Service do
         WantedBy=multi-user.target
 
         [Service]
-        Type=simple
+        Type=oneshot
         ExecStart=#{HOMEBREW_PREFIX}/opt/#{name}/bin/beanstalkd
       EOS
-      expect(unit).to eq(unit_expect)
+      expect(unit).to eq(unit_expect.strip)
     end
   end