1 files changed, 27 insertions, 0 deletions
diff --git a/test/prism/result/node_id_test.rb b/test/prism/result/node_id_test.rb
new file mode 100644
index 0000000000..59b79bc574
--- /dev/null
+++ b/test/prism/result/node_id_test.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require_relative "../test_helper"
+
+module Prism
+  class NodeIdTest < TestCase
+    Fixture.each do |fixture|
+      define_method(fixture.test_name) { assert_node_ids(fixture.read) }
+    end
+
+    private
+
+    def assert_node_ids(source)
+      queue = [Prism.parse(source).value]
+      node_ids = []
+
+      while (node = queue.shift)
+        node_ids << node.node_id
+        queue.concat(node.compact_child_nodes)
+      end
+
+      node_ids.sort!
+      refute_includes node_ids, 0
+      assert_equal node_ids, node_ids.uniq
+    end
+  end
+end