NUnit测试未显示在Visual Studio测试资源管理器中

Question

我做了一个简单的小练习，但它在我目前的经历之外。我对视觉工作室和Nunits都很陌生，基本上我创建了一个简单的数据库和一个用C＃编写的插入/删除/更新它的类，我努力做的是让NUnits为我工作来测试我写的方法。

我已经通过NuGet安装了NUnit 3.0和NUnit适配器，并且已经打开了一个新项目，并添加了我的解决方案，其中我已经编写了一个我编写测试的类库，这里我有点迷失了。我编写的测试没有出现在测试资源管理器中，我已经尝试了每个可以找到的源来解释为什么没有成功，我已经改变了x86和x64之间的处理器架构设置，并且清理和重建等但没有。任何帮助或提示将非常感谢，并提前非常感谢。

这些是方法

namespace Employees
{

    public class DatabaseConnection
    {
        private string connectionString="bla blah blah";    
        SqlConnection connection;

        public string read()
        {
            string query = "SELECT LAST(first_name) FROM Employee";
            using (connection = new SqlConnection(connectionString))
            using (SqlCommand cmd = new SqlCommand(query, connection))
            using (SqlDataAdapter adaptor = new SqlDataAdapter(cmd)) //Reperesents a set of data commands and a database connection
            {
                connection.Open();
                string name = (string)cmd.ExecuteScalar();
                return name;
            }
        }

        public void insertEntry(string first_name,string last_name, string title, string dept)
        {
            string query = "INSERT INTO Employees VALUES ('@first_name','@last_name','@job_title','@department')";
            using (connection = new SqlConnection(connectionString))
            using (SqlCommand cmd = new SqlCommand(query, connection))
            using (SqlDataAdapter adaptor = new SqlDataAdapter(cmd)) //Reperesents a set of data commands and a database connection
            {
                cmd.Parameters.AddWithValue("@first_name", first_name);
                cmd.Parameters.AddWithValue("@last_name", last_name);
                cmd.Parameters.AddWithValue("@job_title", title);
                cmd.Parameters.AddWithValue("@department", dept);

                connection.Open();
                cmd.ExecuteNonQuery();
            }
        }

        public void updateEntry(int id, string first_name, string last_name, string title, string dept)
        {
            string query = "UPDATE Employees SET first_name='@first_name', last_name='@last_name', job_title='@job_title', department='@department' WHERE id = '@Employeeid";
            using (connection = new SqlConnection(connectionString))
            using (SqlCommand cmd = new SqlCommand(query, connection))
            using (SqlDataAdapter adaptor = new SqlDataAdapter(cmd)) //Reperesents a set of data commands and a database connection
            {
                cmd.Parameters.AddWithValue("@first_name", first_name);
                cmd.Parameters.AddWithValue("@last_name", last_name);
                cmd.Parameters.AddWithValue("@job_title", title);
                cmd.Parameters.AddWithValue("@department", dept);
                cmd.Parameters.AddWithValue("@Employeeid", id);

                connection.Open();
                cmd.ExecuteNonQuery();
            }
        }

        public void deleteEntry(int id)
        {
            string query = "DELETE FROM Employees WHERE id = @Employeeid";
            using (connection = new SqlConnection(connectionString))
            using (SqlCommand cmd = new SqlCommand(query, connection))
            using (SqlDataAdapter adaptor = new SqlDataAdapter(cmd)) //Reperesents a set of data commands and a database connection
            {
                cmd.Parameters.AddWithValue("@Employeeid", id);

                connection.Open();
                cmd.ExecuteNonQuery();
            }
        }
    }
}

我计划使用的示例测试用例：

namespace TestLib.NUnitTest
{

    using NUnit.Framework;

    using Employees;

    [TestFixture]
    public class TestClass
    {
        [Test]
        public void insertSuccess()
        {
            string a = "Levi";
            string b = "Smith";
            string c = "Sales Assistant";
            string d = "Sales";
            DatabaseConnection con = new DatabaseConnection();
            con.insertEntry(a, b, c, d);
            string n = con.read();
            Assert.AreEqual(a, n);
        }

        [Test]
        public void insertFail()
        {
            string a = "Levi";
            string b = "Smith";
            string c = "Sales Assistant";
            string d = "Sales";
            DatabaseConnection con = new DatabaseConnection();
            con.insertEntry(a, b, c, d);
            string n = con.read();
            Assert.AreEqual(a, n);
        }

        [Test]
        public void updateSuccess()
        {
            Assert.Pass("This is a pass");

            //DatabaseConnection con = new DatabaseConnection();
            //Assert.That(con.insertEntry(a, b, c, d));
        }

        [Test]
        public void updateFail()
        {
            if (true)
                Assert.Fail("This is a failure");

        }


        [Test]
        public void deleteSuccess()
        {
            Assert.Pass("This is a pass");

            //DatabaseConnection con = new DatabaseConnection();
            //Assert.That(con.insertEntry(a, b, c, d));
        }

        [Test]
        public void deleteFail()
        {
            if (true)
                Assert.Fail("This is a failure");

        }

    }
}