diff --git a/lib/shell/command-processor.rb b/lib/shell/command-processor.rb
index 00357e06fdf0d7..82af76dd5ed711 100644
--- a/lib/shell/command-processor.rb
+++ b/lib/shell/command-processor.rb
@@ -180,6 +180,9 @@ def test(command, file1, file2=nil)
             top_level_test(command, file1)
           end
         else
+          unless FileTest.methods(false).include?(command.to_sym)
+            raise "unsupported command: #{ command }"
+          end
           if file2
             FileTest.send(command, file1, file2)
           else
diff --git a/test/shell/test_command_processor.rb b/test/shell/test_command_processor.rb
index d0bcf8e349f5fc..7e1aa5bce7ed5f 100644
--- a/test/shell/test_command_processor.rb
+++ b/test/shell/test_command_processor.rb
@@ -68,6 +68,24 @@ def test_system_directory
     Dir.rmdir(path)
   end
 
+  def test_test
+    name = "foo#{exeext}"
+    path = File.join(@tmpdir, name)
+    open(path, "w", 0644) {}
+
+    assert_equal(true, @shell[?e, path])
+    assert_equal(true, @shell[:e, path])
+    assert_equal(true, @shell["e", path])
+    assert_equal(true, @shell[:exist?, path])
+    assert_equal(true, @shell["exist?", path])
+    assert_raise_with_message(RuntimeError, /unsupported command/) do
+      assert_equal(true, @shell[:instance_eval, path])
+    end
+  ensure
+    Process.waitall
+    File.unlink(path)
+  end
+
   def test_option_type
     name = 'foo.cmd'
     path = File.join(@tmpdir, name)
diff --git a/version.h b/version.h
index 2f3900ae1b9a8b..2731a5cf132176 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.6.5"
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 113
+#define RUBY_PATCHLEVEL 114
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 10