[ruby/psych] Add test for missing anchor

https://github.com/ruby/psych/commit/5f08137ae6

1 files changed, 11 insertions, 0 deletions

diff --git a/test/psych/test_hash.rb b/test/psych/test_hash.rb
index 6c45da53b7..e5392dc4d9 100644
--- a/test/psych/test_hash.rb
+++ b/test/psych/test_hash.rb
@@ -123,6 +123,17 @@ eoyml
       assert_same(hash.fetch("foo"), hash.fetch("bar"))
     end
 
+    def test_raises_if_anchor_not_defined
+      assert_raise(Psych::BadAlias) do
+        Psych.unsafe_load(<<~eoyml)
+          ---
+          foo: &foo
+            hello: world
+          bar: *not_foo
+        eoyml
+      end
+    end
+
     def test_recursive_hash
       h = { }
       h["recursive_reference"] = h