public void DistinctBy_returns_empty_sequence_if_source_is_null()
{
TypeWithProperty <string>[] source = null !;
var result = DistinctEnumerableExtensions.DistinctBy(source, item => item.Property);
Assert.That(result, Is.Empty);
}
public void DistinctBy_returns_single_item_if_discriminator_is_same([Frozen] string value, TypeWithProperty <string>[] items)
{
var result = DistinctEnumerableExtensions.DistinctBy(items, item => item.Property).ToArray();
Assert.Multiple(() =>
{
Assert.That(result, Has.Exactly(1).InstanceOf <TypeWithProperty <string> >());
Assert.That(result[0].Property, Is.EqualTo(value));
});
}
public void DistinctBy_returns_single_item_if_compound_discriminator_is_same([Frozen] string firstValue, [Frozen] int secondValue, TypeWithMultipleProperties <string, int>[] items)
{
var result = DistinctEnumerableExtensions.DistinctBy(items, item => (item.FirstProperty, item.SecondProperty)).ToArray();
Assert.Multiple(() =>
{
Assert.That(result, Has.Exactly(1).InstanceOf <TypeWithMultipleProperties <string, int> >());
Assert.That(result[0].FirstProperty, Is.EqualTo(firstValue));
Assert.That(result[0].SecondProperty, Is.EqualTo(secondValue));
});
}