调用异步方法的单元测试方法

Question

我有这样的代码

[ DataContract ]
    public sealed class ProductName
    {
        [ DataMember( Order = 1 ) ]
        public string Name { get; private set; }

        public static readonly ProductName Undefined = Create( "Unknown" );

        private ProductName()
        {
        }

        private ProductName( string Name )
        {
            this.Name = Name.Trim();
        }

        public static ProductName Create( string Name )
        {
            Condition.Requires( Name, "Name" ).IsNotNullOrEmpty();

            return new ProductName( Name );
        }

        public static ProductName TryCreate( string Name )
        {
            return Name.IsValidName() ? new ProductName( Name ) : null;
        }

        public override string ToString()
        {
            return this.Name;
        }

        public override int GetHashCode()
        {
                var stableHashCodeIgnoringCase = this.Name.GetStableHashCodeIgnoringCase();
                return stableHashCodeIgnoringCase;
        }

        #region Equality members
        public bool Equals( ProductName other )
        {
            if( ReferenceEquals( null, other ) )
                return false;
            if( ReferenceEquals( this, other ) )
                return true;
            return string.Equals( this.Name, other.Name, StringComparison.InvariantCultureIgnoreCase );
        }

        public override bool Equals( object obj )
        {
            if( ReferenceEquals( null, obj ) )
                return false;
            if( ReferenceEquals( this, obj ) )
                return true;
            if( obj.GetType() != this.GetType() )
                return false;
            return this.Equals( ( ProductName )obj );
        }
        #endregion
    }


    [ DataContract ]
    public class ProductNameIndex
    {
        [ DataMember( Order = 1 ) ]
        public IDictionary< ProductName, ProductId > Products{ get; private set; }

        public ProductNameIndex()
        {
            this.Products = new Dictionary< ProductName, ProductId >();
        }       
    }

我想对Foo进行单元测试，我要测试的一件事是在Process方法中调用某些对象（我有权访问）。问题是在单元测试中进行检查后调用Process方法。如何测试它以使其更加同步？