public void StreamAccess_WithMultipleIndices_EnumeratesSourceAtMostOnce(IEnumerable <int> accessIndices, IEnumerable <string?> expectedTokens)
{
var source = new TokenSource();
var stream = new TokenStream(new StaticLexer(source.GetTokens()));
var tokens = new List <string?>();
var maxIndex = 0;
foreach (var i in accessIndices)
{
tokens.Add(stream.Get(i).Value);
maxIndex = Math.Max(maxIndex, i);
}
source.EnumerationCount.Should().Be(1);
source.MaxStep.Should().Be(maxIndex + 1);
tokens.Should().BeEquivalentTo(expectedTokens);
}