public void ToImmutableDictionary()
{
ImmutableSegmentedDictionary <int, int> .Builder builder =
ImmutableSegmentedDictionary.CreateBuilder <int, int>();
builder.Add(0, 0);
builder.Add(1, 1);
builder.Add(2, 2);
var dictionary = builder.ToImmutableSegmentedDictionary();
Assert.Equal(0, dictionary[0]);
Assert.Equal(1, dictionary[1]);
Assert.Equal(2, dictionary[2]);
builder[1] = 5;
Assert.Equal(5, builder[1]);
Assert.Equal(1, dictionary[1]);
builder.Clear();
Assert.True(builder.ToImmutableSegmentedDictionary().IsEmpty);
Assert.False(dictionary.IsEmpty);
ImmutableSegmentedDictionary <int, int> .Builder?nullBuilder = null;
Assert.Throws <ArgumentNullException>(
"builder",
() => nullBuilder !.ToImmutableSegmentedDictionary()
);
}