1 files changed, 22 insertions, 0 deletions
diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
new file mode 100644
index 0000000000..e25ad75f7a
--- /dev/null
+++ b/test/ruby/test_syntax.rb
@@ -0,0 +1,22 @@
+require 'test/unit'
+
+class TestSyntax < Test::Unit::TestCase
+  def valid_syntax?(code, fname)
+    code = code.dup.force_encoding("ascii-8bit")
+    code.sub!(/\A(?:\xef\xbb\xbf)?(\s*\#.*$)*(\n)?/n) {
+      "#$&#{"\n" if $1 && !$2}BEGIN{throw tag, :ok}\n"
+    }
+    code.force_encoding("us-ascii")
+    catch {|tag| eval(code, binding, fname, 0)}
+  rescue SyntaxError
+    false
+  end
+
+  def test_syntax
+    assert_nothing_raised(Exception) do
+      for script in Dir[File.expand_path("../../../{lib,sample,ext,test}/**/*.rb", __FILE__)].sort
+        assert(valid_syntax?(IO::read(script), script))
+      end
+    end
+  end
+end