1 files changed, 23 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/name_error_test.rb b/activesupport/test/core_ext/name_error_test.rb
new file mode 100644
index 0000000000..5c6c12ffc7
--- /dev/null
+++ b/activesupport/test/core_ext/name_error_test.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+require "active_support/core_ext/name_error"
+
+class NameErrorTest < ActiveSupport::TestCase
+  def test_name_error_should_set_missing_name
+    exc = assert_raise NameError do
+      SomeNameThatNobodyWillUse____Really ? 1 : 0
+    end
+    assert_equal "NameErrorTest::SomeNameThatNobodyWillUse____Really", exc.missing_name
+    assert exc.missing_name?(:SomeNameThatNobodyWillUse____Really)
+    assert exc.missing_name?("NameErrorTest::SomeNameThatNobodyWillUse____Really")
+  end
+
+  def test_missing_method_should_ignore_missing_name
+    exc = assert_raise NameError do
+      some_method_that_does_not_exist
+    end
+    assert_not exc.missing_name?(:Foo)
+    assert_nil exc.missing_name
+  end
+end