public async Task ApplyThrowsArgumentNullExceptionWhenSourceSequenceIsNull()
{
IAsyncEnumerable <string> source = null;
Exception exception = null;
try
{
int length = 0;
source.ShouldBeNull();
await source.ApplyAsync(s => length += s.Length);
}
catch (Exception e)
{
exception = e;
}
exception.ShouldNotBeNull();
exception.ShouldBeOfType <ArgumentNullException>();
}
