Also use capture_output instead of capture_io

hsbt · hsbt · commit 229858ea56b1 · 2021-05-11T19:01:22.000+09:00
diff --git a/test/rubygems/test_gem_doctor.rb b/test/rubygems/test_gem_doctor.rb
@@ -163,7 +163,7 @@ def test_doctor_badly_named_plugins
 
     doctor = Gem::Doctor.new @gemhome
 
-    capture_io do
+    capture_output do
       use_ui @ui do
         doctor.doctor
       end
