How to write test for page Controller? - apex

Question

This is controller:
public class ProductTablePageController {
public List getProducts() {
List<Product__c> results = Database.query(
'SELECT Id, Name, UnitPrice__c, UnitsAvailable__c, Description__c, AddedDate__c, ImageURL__c ' +
'FROM Product__c ' +
'ORDER BY AddedDate__c desc');
return results;
}
}
Here is test
#isTest
public class TestProductApplication {
public class ProductTablePageController {
static testMethod void getProductsTest(){
Product__c newpr = new Product__c();
newpr.Name = 'max';
newpr.UnitPrice__c = 2;
insert newpr;
Product__c resultpr = [SELECT Id, Name, UnitPrice__c FROM Product__c ];
System.assertEquals('max', resultpr.Name);
System.assertEquals(2, resultpr.UnitPrice__c);
} }

Answer 1

You can create an Instance of the controller with the new keyword then call its methods like you would any other class. This will cause the code to execute in a test execution and therefore pass apex tests. I'm not sure if you're using the product you insert as a record to check the method against but you could get rid of that if you want.
#isTest public class TestProductApplication {
static testMethod void getProductsTest(){
Product__c newpr = new Product__c();
newpr.Name = 'max';
newpr.UnitPrice__c = 2;
insert newpr;
Product__c resultpr = [SELECT Id, Name, UnitPrice__c FROM Product__c ];
System.assertEquals('max', resultpr.Name);
System.assertEquals(2, resultpr.UnitPrice__c);
//Initialize the controller
ProductTablePageController ctr = new ProductTablePageController();
List<Product__c> retrndProds = ctr.getProducts(); //Call method and get products
System.assert(retrndProds.size() > 0); //Run assertions on the list
Product__c listProd = retrndProds[0];
System.assert(listProd == resultpr); //Some more checks on the list
}
}
Hope this helps