public void Clear_HasComparer_ReturnsEmptyWithOriginalComparer()
{
ImmutableTrieDictionary <string, int> dictionary = new Dictionary <string, int>
{
{ "a", 1 }
}.ToImmutableTrieDictionary(StringComparer.OrdinalIgnoreCase);
ImmutableTrieDictionary <string, int> clearedDictionary = dictionary.Clear();
Assert.NotSame(ImmutableTrieDictionary <string, int> .Empty, clearedDictionary.Clear());
Assert.NotEmpty(dictionary);
clearedDictionary = clearedDictionary.Add("a", 1);
Assert.True(clearedDictionary.ContainsKey("A"));
}