在外部上下文中重用NSpec规范

Question

我正在研究NSpec框架。

下面是我的例子。我已经为一个简单的HttpRequester类编写了规范：

using Moq;
using NSpec;

namespace FooBrowser.UnitTests.BDD
{
    class HttpRequester_specification : nspec
    {
        private HttpRequester requester;

        private string sentData;
        private int sendTimes;

        private readonly Mock<IConnection> connectionMock;
        private string resource;

        public HttpRequester_specification()
        {
            connectionMock = new Mock<IConnection>();

            connectionMock
                .Setup(x => x.Send(It.IsAny<string>()))
                .Callback<string>(data =>
                {
                    sendTimes++;
                    sentData = data;
                });
        }

        void given_opened_connection_with_no_recent_sends()
        {
            before = () =>
            {
                sendTimes = 0;
            };

            context["when HttpRequester is constructed"] = () =>
            {
                before = () => requester = new HttpRequester(connectionMock.Object);

                it["should not do any request"] = () => sendTimes.should_be(0);

                context["when performing request"] = () =>
                {
                    act = () => requester.Request(resource);

                    context["when resource is not specified"] = () =>
                    {
                        it["should do 1 request"] = () => sendTimes.should_be(1);
                        it["should send HTTP GET / HTTP/1.0"] = () => sentData.should_be("GET / HTTP/1.0");
                    };

                    context["when resource is index.html"] = () =>
                    {
                        before = () => resource = "index.html";

                        it["should do 1 request"] = () => sendTimes.should_be(1);
                        it["should send HTTP GET /index.html HTTP/1.0"] = () => sentData.should_be("GET /index.html HTTP/1.0");
                    };
                };
            };
        }
    }
}

正如你所看到的，“应该做1个请求”= () => sendTimes.should_be(1)；被写了两次。

我试着把它移到外部上下文中，如下所示：

context["when performing request"] = () =>
{
    act = () => requester.Request(resource);

    context["when resource is not specified"] = () =>
    {
        it["should send HTTP GET / HTTP/1.0"] = () => sentData.should_be("GET / HTTP/1.0");
    };

    context["when resource is index.html"] = () =>
    {
        before = () => resource = "index.html";

        it["should send HTTP GET /index.html HTTP/1.0"] = () => sentData.should_be("GET /index.html HTTP/1.0");
    };

    it["should do 1 request"] = () => sendTimes.should_be(1);
};

但这导致它“应该做1个请求”= () => sendTimes.should_be(1)；被检查一次外部上下文，而不是我想要的内部上下文。

那么，我能以某种方式将它移到外部上下文中吗？

或者，向NSpec贡献一些代码来启用这种行为更容易吗？

我在这里发现了类似的问题，Reusing NSpec specifications，但我想保留lambda-expression语法(没有继承)，以便在一个地方看到所有规范。

Answer 1

很抱歉，这两个星期都没有回答，但我只是通过提取如下方法来解决这个问题

void ItShouldRequestExactly(int n)
{
    it["should do " + n + " request"] = () => sendTimes.should_be(n);
}

在大多数情况下，这对我来说已经足够干了。然而，当你传入在规范执行时实际初始化的对象时，你会遇到一些微妙的问题，但对于这个简单的例子来说，它非常适合。遗憾的是，我没有看到另一种将这样的混合断言注入到上下文中的方法。