Add test for NameError#name

test/t/nameerror.rb

@@ -9,7 +9,19 @@ assert('NameError superclass', '15.2.31.2') do
   NameError.superclass == StandardError
 end
 
-# TODO 15.2.31.2.1 NameError#name
+assert('NameError#name', '15.2.31.2.1') do
+
+  # This check is not duplicate with 15.2.31.2.2 check.
+  # Because the NameError in this test is generated in
+  # C API.
+  class TestDummy
+    alias foo bar
+  rescue NameError => e
+    $test_dummy_result = e.name
+  end
+
+  $test_dummy_result == :bar
+end
 
 assert('NameError#initialize', '15.2.31.2.2') do
    e = NameError.new.initialize('a')