1 files changed, 14 insertions, 0 deletions
diff --git a/activerecord/test/cases/migrator_test.rb b/activerecord/test/cases/migrator_test.rb
index bb9835394b..cb44c443c7 100644
--- a/activerecord/test/cases/migrator_test.rb
+++ b/activerecord/test/cases/migrator_test.rb
@@ -290,6 +290,20 @@ class MigratorTest < ActiveRecord::TestCase
     assert_equal [[:up, 1], [:up, 2], [:up, 3]], calls
   end
 
+  def test_migrator_output
+    _, migrator = migrator_class(3)
+
+    result = migrator.migrate("valid")
+    assert_equal(3, result.count)
+
+    # Nothing migrated from duplicate run
+    result = migrator.migrate("valid")
+    assert_equal(0, result.count)
+
+    result = migrator.rollback("valid")
+    assert_equal(1, result.count)
+  end
+
   def test_migrator_rollback
     _, migrator = migrator_class(3)