@Test
public void testBuildExpression4() {

	CalculateDDMFormRuleActionSerializer
		calculateDDMFormRuleActionSerializer =
			new CalculateDDMFormRuleActionSerializer(null);
	Set<String> ddmFormFields = new HashSet<>();
	ddmFormFields.add("Num1");
	ddmFormFields.add("Num2");
	ddmFormFields.add("Num3");
	String expression = "(Num1-Num2*2)-Num3";
	String result = calculateDDMFormRuleActionSerializer.buildExpression(
		expression, ddmFormFields);
	Assert.assertEquals(
		"(getValue('Num1')-getValue('Num2')*2)-getValue('Num3')", result);
}