public void WhenCollectionWithValuesWithMultipleKeysThenShouldGroupValuesWithSameKey()
{
//Arrange
var list = new List <Foo>();
list.Add(new Foo()
{
IntProp = 42, StringProp = "First object with ID 42"
});
list.Add(new Foo()
{
IntProp = 42, StringProp = "Second object with ID 42"
});
list.Add(new Foo()
{
IntProp = 21, StringProp = "First object with ID 21"
});
//Act
var dictionary = DictionaryUtil.ToDictionaryList(list, ks => ks.IntProp);
//Assert
Assert.AreEqual(2, dictionary.Count);
Assert.AreEqual(2, dictionary[42].Count);
Assert.AreEqual(1, dictionary[21].Count);
}
public void WhenNullCollectionThenShouldThrowException()
{
Assert.ThrowsException <ArgumentNullException>(() => DictionaryUtil.ToDictionaryList <int, int>(null, ks => ks));
}
