public void ReadOperation_DoesNotDelegateToSourceDictionary_OnceValueIsAdded()
{
// Arrange
var source = new Dictionary <string, object>(StringComparer.OrdinalIgnoreCase)
{
{ "key1", "value1" },
{ "key2", "value2" }
};
var holder = new CopyOnWriteDictionaryHolder <string, object>(source);
// Act
holder.Add("key3", "value3");
holder.Remove("key1");
// Assert
Assert.Equal(2, source.Count);
Assert.Equal("value1", source["key1"]);
Assert.Equal(2, holder.Count);
Assert.Equal("value2", holder["KeY2"]);
Assert.Equal("value3", holder["key3"]);
Assert.True(holder.HasBeenCopied);
Assert.NotSame(source, holder.ReadDictionary);
}
public void ReadOperation_DelegatesToSourceDictionary_IfNoMutationsArePerformed()
{
// Arrange
var source = new Dictionary <string, object>(StringComparer.OrdinalIgnoreCase)
{
{ "test-key", "test-value" },
{ "key2", "key2-value" }
};
var holder = new CopyOnWriteDictionaryHolder <string, object>(source);
// Act and Assert
Assert.Equal("key2-value", holder["key2"]);
Assert.Equal(2, holder.Count);
Assert.Equal(new string[] { "test-key", "key2" }, holder.Keys.ToArray());
Assert.Equal(new object[] { "test-value", "key2-value" }, holder.Values.ToArray());
Assert.True(holder.ContainsKey("test-key"));
object value;
Assert.False(holder.TryGetValue("different-key", out value));
Assert.False(holder.HasBeenCopied);
Assert.Same(source, holder.ReadDictionary);
}
public CopyOnWriteDictionaryHolder(CopyOnWriteDictionaryHolder <TKey, TValue> source)
{
_source = source._copy ?? source._source;
_copy = null;
}