diff --git a/activerecord/test/cases/adapter_test.rb b/activerecord/test/cases/adapter_test.rb
index 03bd9fd384405..d90003b0ba156 100644
--- a/activerecord/test/cases/adapter_test.rb
+++ b/activerecord/test/cases/adapter_test.rb
@@ -456,15 +456,15 @@ def setup
       @connection = ActiveRecord::Base.connection
     end
 
-    test "reconnect after a disconnect" do
-      assert_predicate @connection, :active?
-      @connection.disconnect!
-      assert_not_predicate @connection, :active?
-      @connection.reconnect!
-      assert_predicate @connection, :active?
-    end
-
     unless in_memory_db?
+      test "reconnect after a disconnect" do
+        assert_predicate @connection, :active?
+        @connection.disconnect!
+        assert_not_predicate @connection, :active?
+        @connection.reconnect!
+        assert_predicate @connection, :active?
+      end
+
       test "transaction state is reset after a reconnect" do
         @connection.begin_transaction
         assert_predicate @connection, :transaction_open?