1 files changed, 10 insertions, 1 deletions
diff --git a/activesupport/test/core_ext/load_error_test.rb b/activesupport/test/core_ext/load_error_test.rb
index 31863d0aca..5f804c749b 100644
--- a/activesupport/test/core_ext/load_error_test.rb
+++ b/activesupport/test/core_ext/load_error_test.rb
@@ -14,6 +14,15 @@ class TestMissingSourceFile < ActiveSupport::TestCase
       assert_equal 'nor/this/one.rb', e.path
     end
   end
+
+  def test_is_missing
+    begin load 'nor_does_this_one'
+    rescue MissingSourceFile => e
+      assert e.is_missing?('nor_does_this_one')
+      assert e.is_missing?('nor_does_this_one.rb')
+      assert_not e.is_missing?('some_other_file')
+    end
+  end
 end
 
 class TestLoadError < ActiveSupport::TestCase
@@ -29,4 +38,4 @@ class TestLoadError < ActiveSupport::TestCase
       assert_equal 'nor/this/one.rb', e.path
     end
   end
-end
-\ No newline at end of file
+end