Try to create schema migrations table in schema dumper test

activerecord/test/cases/schema_dumper_test.rb

@@ -2,6 +2,11 @@
 
 
 class SchemaDumperTest < ActiveRecord::TestCase
+  def initialize(*)
+    super
+    ActiveRecord::SchemaMigration.create_table
+  end
+
   def setup
     super
     @stream = StringIO.new