Selenium Class instantiation

Question

Hello I am have trouble using a method from an Instantiated class. I am rather new to selenium and C#, but here is my code to start...

class 1

 [TestClass]
    public class UnitTest1
    {
        Class2 myClass2 = new Class2();

        static IWebDriver webDriver;

        [AssemblyInitialize]
        public static void invokeBrowser(TestContext context)
        {
            webDriver = new ChromeDriver(@"C:\Selenium\");
        }

        [TestMethod]
        public void TestMethod1()
        {
            myClass2.RandomMethod();
        }

class 2

[TestClass]
    public class Class2
    {
        static IWebDriver webDriver;
        public void invokeBrowser(TestContext context)
        {
            webDriver = new ChromeDriver(@"C:\Selenium\");
        }


        [TestMethod]
        public void RandomMethod()
        {
            webDriver.Navigate().GoToUrl("http://google.com");
        }
    }

my error happens in Class1 during my testmethod that I am using to call the Randommethod from my other class

Message: Test method CheckRequest.UnitTest1.TestMethod1 threw exception: 
System.NullReferenceException: Object reference not set to an instance of an object.

I have been struggling with this error for a while and I just dont understand what I am doing wrong. The only object that I am setting is my webdriver. Is the issue that I am creating two different webdriver objects? Thanks for your time, and any help is much appreciated.

Your Class2 never actually instantiates the webDriver. Is that intentional? Just because you built it in Class1 doesn't mean anything to Class2. — Bob G, Aug 09 '17 at 15:58
Possible duplicate of [What is a NullReferenceException, and how do I fix it?](https://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it) — JeffC, Aug 09 '17 at 16:34

score 0 · Accepted Answer · answered Aug 10 '17 at 08:40

[TestClass]
    public class UnitTest1
    {
        Class2 myClass2 = new Class2();

        public static IWebDriver webDriver;

        [AssemblyInitialize]
        public static void invokeBrowser(TestContext context)
        {
            webDriver = new ChromeDriver(@"C:\Selenium\");
        }

        [TestMethod]
        public void TestMethod1()
        {
            myClass2.RandomMethod();
        }
}

//Class2
[TestClass]
    public class Class2
    {
        //[TestMethod]
        public void RandomMethod()
        {
            UnitTest1.webDriver.Navigate().GoToUrl("http://google.com");
        }
    }

[AssemblyInitialize] method will be called before any method in the project, so wedDriver will have value. TestMethod1 will call RandomMethod(), if you keep [TestMethod] for RandomMethod, it will be executed twice, as each [TestMethod] will be ran, when you run all the TestMethods. Is that what you need.

Selenium Class instantiation

1 Answers1