expression.getConditions().add(condition);
expectedExpressions.add(expression);
expression = new ConditionExpression(ConditionExpression.AND_OPERATOR);
condition = new Condition("isNull");
condition.addParam("variable1");
expression.getConditions().add(condition);
expectedExpressions.add(expression);
expression = new ConditionExpression(ConditionExpression.AND_OPERATOR);
condition = new Condition("greaterThan");