Define enable_extension method to prevent undefined method error

When mixing postgresql and another adapter like sqlite3 (for dev and test
respectively), the task `db:test:prepare` will fail due to the `enable_extension`
method not being defined in the abstract adapter. This patch simply adds an
empty definition to prevent it.

2 files changed, 24 insertions, 0 deletions

diff --git a/activerecord/test/cases/adapters/mysql/mysql_adapter_test.rb b/activerecord/test/cases/adapters/mysql/mysql_adapter_test.rb
index 4a23287448..9ad0744aee 100644
--- a/activerecord/test/cases/adapters/mysql/mysql_adapter_test.rb
+++ b/activerecord/test/cases/adapters/mysql/mysql_adapter_test.rb
@@ -108,6 +108,18 @@ module ActiveRecord
         assert_equal 2, result.column_types['status'].type_cast(result.last['status'])
       end
 
+      def test_supports_extensions
+        assert_not @conn.supports_extensions?, 'does not support extensions'
+      end
+
+      def test_respond_to_enable_extension
+        assert @conn.respond_to?(:enable_extension)
+      end
+
+      def test_respond_to_disable_extension
+        assert @conn.respond_to?(:disable_extension)
+      end
+
       private
       def insert(ctx, data, table='ex')
         binds   = data.map { |name, value|
diff --git a/activerecord/test/cases/adapters/sqlite3/sqlite3_adapter_test.rb b/activerecord/test/cases/adapters/sqlite3/sqlite3_adapter_test.rb
index a8e5ab81e4..6ba6518eaa 100644
--- a/activerecord/test/cases/adapters/sqlite3/sqlite3_adapter_test.rb
+++ b/activerecord/test/cases/adapters/sqlite3/sqlite3_adapter_test.rb
@@ -354,6 +354,18 @@ module ActiveRecord
         assert_nil @conn.primary_key('failboat')
       end
 
+      def test_supports_extensions
+        assert_not @conn.supports_extensions?, 'does not support extensions'
+      end
+
+      def test_respond_to_enable_extension
+        assert @conn.respond_to?(:enable_extension)
+      end
+
+      def test_respond_to_disable_extension
+        assert @conn.respond_to?(:disable_extension)
+      end
+
       private
 
       def assert_logged logs