public void TestGroupByExceptions()
{
List <ProductsList.Product> products1 = null;
Func <ProductsList.Product, string> elementSelector = x => x.Name;
Func <ProductsList.Product, int> keySelector = x => x.Ingredients.Count;
Func <int, IEnumerable <string>, KeyValuePair <int, IEnumerable <string> > > resultSelector = (IngredientsCount, ProductNames) =>
{
return(new KeyValuePair <int, IEnumerable <string> >(IngredientsCount, ProductNames));
};
var result = LinqFunctions.GroupBy(products1,
x => keySelector(x),
y => elementSelector(y),
(IngredientCount, ProductNames) => resultSelector(IngredientCount, ProductNames),
EqualityComparer <int> .Default
);
var numerator = result.GetEnumerator();
var exception = Assert.Throws <ArgumentNullException>(() => numerator.MoveNext());
Assert.Equal("source", exception.ParamName);
}
public void TestGroupBy()
{
var products = new List <ProductsList.Product>()
{
new ProductsList.Product//2 ingredients
{
ID = 2,
Name = "Dero",
Price = 10,
Ingredients = new List <ProductsList.Ingredient> {
new ProductsList.Ingredient {
Name = "Lamaie"
}, new ProductsList.Ingredient {
Name = "Parfum1"
}
}
},
new ProductsList.Product//2 ingredients
{
ID = 2,
Name = "Dero",
Price = 10,
Ingredients = new List <ProductsList.Ingredient> {
new ProductsList.Ingredient {
Name = "Lamaie"
}, new ProductsList.Ingredient {
Name = "Parfum5"
}
}
},
new ProductsList.Product//1 ingredient
{
ID = 6,
Name = "Sampon",
Price = 10,
Ingredients = new List <ProductsList.Ingredient> {
new ProductsList.Ingredient {
Name = "Menta"
}
}
},
new ProductsList.Product//3 ingredients
{
ID = 2,
Name = "Detergent",
Price = 11,
Ingredients = new List <ProductsList.Ingredient> {
new ProductsList.Ingredient {
Name = "Lamaie"
}, new ProductsList.Ingredient {
Name = "Parfum1"
}, new ProductsList.Ingredient {
Name = "Parfum5"
}
}
},
};
Func <ProductsList.Product, string> elementSelector = x => x.Name;
Func <ProductsList.Product, int> keySelector = x => x.Ingredients.Count;
Func <int, IEnumerable <string>, KeyValuePair <int, IEnumerable <string> > > resultSelector = (IngredientsCount, ProductNames) =>
{
return(new KeyValuePair <int, IEnumerable <string> >(IngredientsCount, ProductNames));
};
var result = LinqFunctions.GroupBy(products,
x => keySelector(x),
y => elementSelector(y),
(IngredientCount, ProductNames) => resultSelector(IngredientCount, ProductNames),
EqualityComparer <int> .Default
);
var numerator = result.GetEnumerator();
numerator.MoveNext();
Assert.Equal(new string[] { "Dero", "Dero" }, numerator.Current.Value.ToArray());
Assert.Equal("2", numerator.Current.Key.ToString());
Assert.True(numerator.MoveNext());
Assert.Equal(new string[] { "Sampon" }, numerator.Current.Value.ToArray());
Assert.Equal("1", numerator.Current.Key.ToString());
Assert.True(numerator.MoveNext());
Assert.Equal(new string[] { "Detergent" }, numerator.Current.Value.ToArray());
Assert.Equal("3", numerator.Current.Key.ToString());
Assert.False(numerator.MoveNext());
}
