System.Linq.Tests.SelectTests.Select_ExceptionThrownFromGetEnumeratorOnSource_CurrentIsSetToDefaultOfItemTypeAndIteratorCanBeUsedAfterExceptionIsCaught C# (CSharp) Méthode

        public void Select_ExceptionThrownFromGetEnumeratorOnSource_CurrentIsSetToDefaultOfItemTypeAndIteratorCanBeUsedAfterExceptionIsCaught()
        {
            IEnumerable<int> source = new ThrowsOnGetEnumerator();
            Func<int, string> selector = i => i.ToString();

            var result = source.Select(selector);
            var enumerator = result.GetEnumerator();

            Assert.Throws<InvalidOperationException>(() => enumerator.MoveNext());
            string currentValue = enumerator.Current;
            Assert.Equal(default(string), currentValue);

            Assert.True(enumerator.MoveNext());
            Assert.Equal("1", enumerator.Current);
        }