ProductTest.java

package com.someaddress.test;

import com.someaddress.model.Product;
import com.someaddress.intent.DetailsUpdateIntent;

import java.math.BigDecimal;
import org.testng.Assert;
import org.testng.annotations.Test;

public class ProductTest {
	@Test
	public void testUpdateDetails() {
		DetailsUpdateIntent intent = new DetailsUpdateIntent();
		intent.setId("xy12");
		intent.setName("White Cow Milk");
		intent.setDescription("Very fresh milk ready to consume");
		intent.setPrice(BigDecimal.valueOf(-1));
		
		Product product = new Product();
		
		try {
			product.handleDetailsUpdate(intent);
			Assert.fail("Should not accept negative prices.");
		} catch (IllegalArgumentException e) {}
		
		BigDecimal newPrice = BigDecimal.valueOf(2.42);
		intent.setPrice();
		product.handleDetailsUpdate(intent);
		Assert.assertEquals(product.getPrice(), newPrice, "Should have 2.42 as price.");
	}
}