1 files changed, 6 insertions, 0 deletions
diff --git a/spec/ruby/library/stringscanner/check_until_spec.rb b/spec/ruby/library/stringscanner/check_until_spec.rb
index e92ae5a2e9..ad222fd76b 100644
--- a/spec/ruby/library/stringscanner/check_until_spec.rb
+++ b/spec/ruby/library/stringscanner/check_until_spec.rb
@@ -12,4 +12,10 @@ describe "StringScanner#check_until" do
     @s.matched.should == "a"
     @s.check_until(/test/).should == "This is a test"
   end
+
+  it "raises TypeError if given a String" do
+    -> {
+      @s.check_until('T')
+    }.should raise_error(TypeError, 'wrong argument type String (expected Regexp)')
+  end
 end