How do i check if Static variables are modified during unittest

Question

I'm working with a rather large test set (over 5000 seperate test methodes) and it apears that some test sometimes modify static variables that they shouldn't, so i was wondering if there was a way to create a test that tests if a variable has been modified, during all the other tests

i'm unable to modify the variables directly but i can write unit test and modify the settings pertaining there to

i'm working in VS 2017 with C# 8.0 and mstest v.2

thanks

Answer 1

You can mark methods in your test class to run before or after each test.

So you can do something like this:

[TestClass]
public class MyTestClass
{
   private int originalValue; // adjust the type as needed

   [TestInitialize]
   public void PreTest()
   {
      // remember the value before the test
      originalValue = MyContainer.StaticValue; // or whatever it is called in your system
   }

   [TestCleanup]
   public void PostTest()
   {
      // check the current value against the remembered original one
     if (MyContainer.StaticValue != originalValue)
     {
        throw new InvalidOperationException($"Value was modified from {originalValue} to {MyContainer.StaticValue}!");
     }
   }

   [TestMethod]
   public void ExecuteTheTest()
   {
      // ...
   }
}

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