例如(参考下面我的示例代码).是否有两到三倍的测试来覆盖使用几种不同类型的TKey,TNode类来测试方法？还是只有一堂课？

public class TopologyBase<TKey,TNode,TRelationship> 
    where TNode : NodeBase<TKey>,new() 
    where TRelationship : RelationshipBase<TKey>,new()

{
    // Properties
    public Dictionary<TKey,NodeBase<TKey>> Nodes { get; private set; }
    public List<RelationshipBase<TKey>> Relationships { get; private set; }

    // Constructors
    protected TopologyBase()
    {
        Nodes = new Dictionary<TKey,NodeBase<TKey>>();
        Relationships = new List<RelationshipBase<TKey>>();
    }

    // Methods
    public TNode CreateNode(TKey key)
    {
        var node = new TNode {Key = key};
        Nodes.Add(node.Key,node);
        return node;
    }

    public void CreateRelationship(NodeBase<TKey> parent,NodeBase<TKey> child) {
    .
    .
    .