Move test related to `tmp:clear` task to `tmp_test.rb`

railties/test/application/rake/tmp_test.rb

@@ -31,6 +31,13 @@ def teardown
           assert_not File.exist?("tmp/screenshots/fail.png")
         end
       end
+
+      test "tmp:clear should work if folder missing" do
+        FileUtils.remove_dir("#{app_path}/tmp")
+        errormsg = Dir.chdir(app_path) { `bin/rails tmp:clear` }
+        assert_predicate $?, :success?
+        assert_empty errormsg
+      end
     end
   end
 end

railties/test/application/rake_test.rb

@@ -391,12 +391,5 @@ def test_template_load_initializers
 
       assert_match(/Hello, World!/, output)
     end
-
-    def test_tmp_clear_should_work_if_folder_missing
-      FileUtils.remove_dir("#{app_path}/tmp")
-      errormsg = Dir.chdir(app_path) { `bin/rails tmp:clear` }
-      assert_predicate $?, :success?
-      assert_empty errormsg
-    end
   end
 end