使用TestCaseSource导致空指针C＃的NUnit [英] C# NUnit using TestCaseSource results in NullPointer

问题描述

我有以下类，这是它有一个测试和产生的TestCase我一个TestCaseSource一个的TestFixture。我的测试情况下，实际上包含两个实际结果与预期结果是被包裹在一个名为TestCaseEntity

I have the following class which is a TestFixture which has one test and a TestCaseSource that produces my TestCases. My test case actually contain both the actual result and the expected result which is wrapped in an Object called TestCaseEntity

namespace SomeNamespace
{
    [TestFixture]
    public class MyTest
    {
        static Client client;
        static List<string> userIds = new List<string>();

        [TestFixtureSetUp]
        public void Init()
        {
            // Set up a client
            client = new Client("server address"); // a HTTP client

            // populate a List of userIds from a local text test file
            userIds.Add(GetAllIdsFromTxtFile());
        }

        [Test, TestCaseSource(typeof(MyTestCaseEntityFactory), "MyTestCases")]
        public void CheckExpectations(TestCaseEntity testCaseEntity)
        {
            if (!testCaseEntity.IsIdentical)
            {
                Log.Error("Log some shit");
                Assert.Fail("fail assertions");
            }
        }

        public class MyTestCaseEntityFactory
        {
            public static IEnumerable<TestCaseEntity> MyTestCases
            {
                get
                {
                    foreach (string id in userIds)
                    {
                        // use the client and get the results, construct the new TestCaseEntity(...) and return;
                        yield return new TestCaseEntity("actualValue", "expectedValue resulting from the server call");
                    }
                }
            }
        }
    }
}

当我运行我的测试，我得到以下错误这是不幸的是不是非常有帮助！

When I run my Test, I get the following error which is unfortunately not very helpful!

System.NullReferenceException : Object reference not set to an instance of an object.

这是我可能做错了？

推荐答案

您的foreach超过 allSalesDEDealIds ，但你似乎已经不在您的代码示例包含它。它可能是，这是 NullRefException 在你的代码？

You foreach over allSalesDEDealIds but you seem to have not included it in your code example. It might be that this is the NullRefExceptionin your code?

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