Add parsing error test

Author: soutaro

test/rbs/inline_annotation_parsing_test.rb

@@ -73,4 +73,10 @@ def test_parse__rbs_method_types_annotation
       assert_equal ["|"], annot.vertical_bar_locations.map(&:source)
     end
   end
+
+  def test_error__unknown_annotation
+    assert_raises RBS::ParsingError do
+      Parser.parse_inline_leading_annotation("@rbs super String", 0...)
+    end
+  end
 end