public void FirstOrNull_ShouldEnumerateOnce()
{
// arrange
var data = new TestEnumerable <int> (new[] { 1, 2, 3 });
// act
var result = data.Enumerate().FirstOrNull();
// assert
result.Should().Be(1);
data.EnumeratedCount.Should().Be(1);
}
public void IsNullOrEmpty_ShouldEnumerateOnce()
{
// arrange
var data = new TestEnumerable <string> (new[] { "a", "b", "c" });
// act
var result = data.Enumerate().IsNullOrEmpty();
// assert
result.Should().BeFalse();
data.EnumeratedCount.Should().Be(1);
}