Fix postgres test for rake db:structure:dump and db:structure:load

Author: JesseChavez

test/rake_test_support.rb

@@ -122,10 +122,12 @@ def new_application
   # (Test) Helpers :
 
   def create_schema_migrations_table(connection = ActiveRecord::Base.connection)
-    schema_migration = ActiveRecord::SchemaMigration.table_name
-    return if connection.data_source_exists?(schema_migration)
-    connection.create_table(schema_migration, :id => false) do |t|
-      t.column :version, :string, :null => false
+    schema_migration = connection.schema_migration
+
+    return if schema_migration.table_exists?
+
+    connection.create_table(schema_migration.table_name, id: false) do |t|
+      t.column :version, :string, null: false
     end
   end