lib/shell/command-processor.rb (Shell#[]): prevent unknown command

`FileTest.send(command, ...)` allows to call not only FileTest-related
methods but also any method that belongs to Kernel, Object, etc.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67810 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 18 insertions, 0 deletions

diff --git a/test/shell/test_command_processor.rb b/test/shell/test_command_processor.rb
index d0bcf8e349..7e1aa5bce7 100644
--- a/test/shell/test_command_processor.rb
+++ b/test/shell/test_command_processor.rb
@@ -68,6 +68,24 @@ class TestShell::CommandProcessor < Test::Unit::TestCase
     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)