RAD II Final Project

Recipe Helper

public class RecipeHelper {
    
    public static void addIngredient (String ingredientName, Integer measurementAmount, String measurementType, ID recipeId) {
        //code
        //Your code should create an Ingredient SObject in memory and insert it in the database.
        //The ingredient should have the recipe id provided as its parent.
        Ingredient__c ingred = new Ingredient__c();
        ingred.Name = ingredientName;
        ingred.Calories__c = 44;
        ingred.Measurement__c=measurementAmount;
        ingred.Measurement_Type__c = measurementType;
        ingred.Recipe__c = recipeId;
        
        insert ingred;
    }
    
    
    public static List<String> generateGroceryList(ID recipeId){
        //This method does something very cool, it makes a list of the ingredients you need, along with their quantities. 
        //For now, your method should be able to return a list of strings representing ingredient names.
        List <Ingredient__c> newIngredients = [SELECT Name from Ingredient__c WHERE Recipe__c = :recipeId];
        List < String > groceryList = new List < String >();
        
        for (Ingredient__c i:newIngredients) {
            groceryList.add(i.Name); 
        }
        system.debug('Grocery list: ' + groceryList);
        return GroceryList;
    }
    
    
    public static void scaleRecipeForServings (ID recipeId, Integer desiredServings){
        List <Ingredient__c> myIngredients = [SELECT Name,Measurement__c, Measurement_Type__c from Ingredient__c WHERE Recipe__c = :recipeId];
        List < String > scaledList = new List < String >();
        
        Recipe__c rec = [SELECT Servings__c FROM Recipe__c WHERE ID =:recipeID];
        //throw error if desired servings is 0       
        if (desiredServings==0) {
            //Add error only works in triggers, so this won't work
            //could add a custom exception. could change from void to return something, and then the error would block
            //the error is only going to be thrown if we do a DML statement//
         	// see what Prasanna Did
            rec.addError('ERROR: desired servings is 0');
            system.debug('Error it is 0');}
        Decimal ratio = desiredServings/rec.Servings__c;
        system.debug('ratio:' + ratio);
        Decimal newAmount;
        //new Decimal = Divide desiredservings by Servings. multiply Measurement by that
        //Loop through ingredients. multiply measurement by new Decimal.
        for (Ingredient__c i:myIngredients) {
            newAmount = i.Measurement__c * ratio;
            system.debug('New Amount:' + newAmount);
            scaledList.add(newAmount + ' ' + i.Measurement_type__c + ' ' +i.Name); 
        }
        system.debug('New list of amounts ' + scaledList);
        
    }
}

Recipe Helper Test

@isTest
public class RecipeHelperTest {
    
    //need to add test for recipeRecordType
    //
    @TestSetup
    static void createRecipe(){
        Recipe__c rec = new Recipe__c();
        rec.Name = 'Test Recipe 3';
        rec.Active_Time__c = 2;
        rec.Description__c = 'recipe';
        rec.Active_Time_Units__c = 'Hours';
        rec.Servings__c = 4;
        rec.Name__c= 'Test Recipe 3';
        
        insert rec;
        
    }
    //This test is to make sure the ingredient is added to the database with the recipe Id as parent.    
    @isTest static void addIngredientPositiveTest() {
        Recipe__c rec = [SELECT Id from Recipe__c];
        Test.startTest();
        RecipeHelper.addIngredient('Wheat Flour', 4, 'Cups', rec.Id);
        Test.stopTest();
        Ingredient__c ing = [SELECT Recipe__c,Measurement__c,Measurement_Type__c,Name FROM Ingredient__c];
        System.AssertEquals(rec.Id,ing.Recipe__c,  'expected recipeID');
        System.AssertEquals(4, ing.Measurement__c,'expected 4');
        System.AssertEquals('Cups',ing.Measurement_Type__c, 'I expected Cups');
        System.AssertEquals( 'Wheat Flour', ing.Name,'expected wheat flour');
        System.debug('Recipe Id from ingredient: ' +ing.recipe__c);
    }
    //This test is to make sure the ingredient is added to the database with the recipe Id as parent only ONCE.    
    @isTest static void addIngredientOneTimeTest() {
        Recipe__c rec = [SELECT Id from Recipe__c];
        Test.startTest();
        RecipeHelper.addIngredient('Wheat Flour', 4, 'Cups', rec.Id);
        Test.stopTest();
        List<Ingredient__c> ing = [SELECT Recipe__c,Measurement__c,Measurement_Type__c,Name FROM Ingredient__c];
        System.Assertequals(1,ing.size(),'expect only one recipe');
        
    }
    
    
    
    
    @isTest static void groceryListTest() {
        //setup Data. lookup recipe ID and add 3 ingredients using addIngredient method   	
        Recipe__c rec = [SELECT Id from Recipe__c];
        RecipeHelper.addIngredient('Walnuts', 1, 'Cups', rec.Id);
        RecipeHelper.addIngredient('Milk', 4, 'Tbl', rec.Id);
        RecipeHelper.addIngredient('Oil', 1, 'Tbl', rec.Id);
        //add the ingredients to a list for comparison    
        List <String> ingreds = new List <String> ();
        ingreds.add('Walnuts');
        ingreds.add('Milk');
        ingreds.add('Oil');
        
        Test.startTest();
        //This returns a list of the ingredients because the method returns a list.	
        List<String> groceryList = RecipeHelper.generateGroceryList(rec.id); 
        Test.stopTest();	
        System.AssertEquals(ingreds, groceryList,'expected walnut, milk, oil');
        
    }
    
    @isTest static void scaleRecipeForServingsTest() {
        //setup Data. lookup recipe ID and add 3 ingredients using addIngredient method   	
        Recipe__c rec = [SELECT Id from Recipe__c];
        RecipeHelper.addIngredient('Walnuts', 1, 'Cups', rec.Id);
        RecipeHelper.addIngredient('Milk', 4, 'Tbl', rec.Id);
        RecipeHelper.addIngredient('Oil', 1, 'Tbl', rec.Id);
        
        
        Test.startTest();
        RecipeHelper.scaleRecipeForServings(rec.id,8);
        Test.stopTest();
        
    }
    @isTest static void scaleRecipeForServingsNegativeTest() {
        //setup Data. lookup recipe ID and add 3 ingredients using addIngredient method   	
        Recipe__c rec = [SELECT Id from Recipe__c];
        RecipeHelper.addIngredient('Walnuts', 1, 'Cups', rec.Id);
        RecipeHelper.addIngredient('Milk', 4, 'Tbl', rec.Id);
        RecipeHelper.addIngredient('Oil', 1, 'Tbl', rec.Id);
        
        Boolean bools=false;
        
        Test.startTest();
        
        try {
            RecipeHelper.scaleRecipeForServings(rec.id,0);
        } catch (Exception e) {
            if(e.getMessage().equalsIgnoreCase('ERROR: desired servings is 0')) {
                bools = true;
                
            } system.debug('this is the error:' + e.getmessage());
        }
        
        Test.stopTest();
        // Did we get the expected error?
        System.assertEquals(true,bools, 'Expected error because desired servings is 0.');
    }	
}