Fiddler Core dlls

MockWebProxyHelper

public static class MockWebProxyHelper
{
  public static void SetUp() {...}
  public static void TearDown() {...}

  public class Response
  {
    public string Header { get; set; } // default "HTTP/1.1 200 OK"
    public string Body { get; set; } // default ""
  }
  public static Func<HttpMethods, string, Response> GetMockResponse
    = delegate { return new Response(); };
}

Set up & Tear down

[TestFixture]
public class StockCheckClientBackgroundWorkerTests
{
    [TestFixtureSetUp]
    public void StartFiddlerProxy()
    {
        MockWebProxyHelper.SetUp();
    }

    [TestFixtureTearDown]
    public void StopFiddlerProxy()
    {
        MockWebProxyHelper.TearDown();
    }

Mock response

[Test]
public void TestMockClientCall()
{
  MockWebProxyHelper.GetMockResponse = (httpMethod, url) =>
    new MockWebProxyHelper.Response(body: 
      @"{'productCount':1,
         'products':[
           {'productId':'1012881',
            'categoryId':
            'CAT13617200330',
            'availableStock':'23'}
         ]}");

  // dummy key - should work anyways, cos it's a mock!
  var client = new StockCheckClient {AuthKey = "dummy-auth-key"};

  List<Product> inStockProducts =
    client.GetCategoryItemsInStock("CAT13617200330");
  Assert.AreEqual(1, inStockProducts.Count);
  Assert.AreEqual(23, inStockProducts[0].AvailableStock);
}

Possible uses

Dummy response files

eg http://myapi.com/products?categoryId=CAT13617200330

filename "GET myapi_com_products_categoryId_CAT13617200330.txt":

HTTP/1.1 200 OK
{'productCount':1,'products':[{'productId':'1012881','categoryId':'CAT13617200330','availableStock':'23'}]}

[TestFixtureSetUp]
public void StartFiddlerProxy()
{
  MockWebProxyHelper.SetUp();
  MockWebProxyHelper.GetMockResponse = (httpMethod, url) =>
  {
    var file = url.Replace("http://", "")
      .Replace('/', '_').Replace('?', '_').Replace('=', '_');
    var lines = File.ReadAllLines(httpMethod + " " + file +".txt");
    return new MockWebProxyHelper.Response(
      header: lines.First(),
      body: String.Join(Environment.NewLine, lines.Skip(1)));
  }
}

Return actual data

MockWebProxyHelper.GetMockResponse =
  (httpMethod, url) =>
  {
    // eg http://myapi.com/products?categoryId=CAT13617200330
    var categoryId = url.Split('=').Last();
    var products =
      productsRepository.Where(x => x.CategoryId == categoryId);

    var body = JsonConvert.SerializeObject(responseObject));
    return new MockWebProxyHelper.Response(body: body);
  };

Fake "chaos monkey"

// TODO:

Record mode

MOAR?