Mstest testinitialize not called dating

Jeremy Bytes: Unit Testing: Setup Methods or Not?

mstest testinitialize not called dating

This beta release is NOT the first public iteration of MSTest v2, but . GetDisplayName will be displayed when the test is executed via the target. We were talking about various unit testing frameworks (NUnit vs xUnit. The class is called "MainWindowViewModel", so I have a test class called good because it depends on the current culture having "MM/dd/yyyy" as the date format . Notice that this method does not have the [TestInitialize] attribute. Open a shell window. Create a directory called unit-testing-using-mstest to hold the solution. . IsFalse(result, $"{value} should not be prime"); }.

And yes, using "DateTime. I'm re-doing this demo code which will fix thisbut it's not posted on my site yet. This holds our stub object that we use later in the tests.

mstest testinitialize not called dating

We're using MSTest in this example. When we mark the method with the [TestInitialize] attribute, this method is run before every test. Here's what one of our tests looks like: The rest of the test makes sure that our "RefreshPeopleCommand" behaves as expected.

In this case, it should populate the "People" property with our fake data.

mstest testinitialize not called dating

Here's another test for the ClearPeopleCommand: This is similar to the previous test. Again, feel free to check out the session materials for more details. What's So Bad About This? The problem with this code is that we need to go somewhere else to get more information about this test. This actually isn't quite as bad as the problem described by Osherove and we'll look at that in just a bit.

To see how things can be more readable, let's change our Setup method to a factory that's responsible for creating our stub. A Look at a Factory Method Instead of using a Setup method and a class-level field, we'll use a factory method that returns the type that we're looking for.

Unit testing C# with MSTest and .NET Core

When we look at this method, it looks almost exactly like the "Setup" method from above. The difference is that instead of setting a class-level field, we return the "IPersonRepository" stub. Notice that this method does not have the [TestInitialize] attribute. Here's a refactored test: We have a new line of code in this test. The first line of code calls the "GetRepositoryStub" method that we just created and assigns it to a local variable that is then used in our test.

The other test will have a similar change: What's So Good About This? The advantage of using the factory method is that all of the code is directly run in the test methods.

mstest testinitialize not called dating

There is now no question as to what "repository" is. We can easily see that it is an "IPersonRepository" without having to scroll to the top of the class. In addition, we can see that we are initializing it with the "GetRepositoryStub" method. This gives us a clue that we're creating a stub object that we can use in our tests. I'm currently examining how I name the variables used in my unit tests based on Osherove's book and my experiences.

I'll have to get back around to this in a future article. Observations Readability of unit tests is extremely important. We need to think about how these tests are used. They aren't just used when we're writing the code, they are also used as we continue to develop the code. And they are also used when we go back to fix bugs or add features. Debugging When a test fails, we want to make things as easy as possible for the developer to figure out what's going on.

mstest testinitialize not called dating

The first step is to make sure we have good names on our tests. If we have good names for our tests that describe what the test is doing and what is expectedthen we often don't have a need to look at the test code itself.

But when we do look at the test code, we want things to be as obvious as possible. The developer trying to debug the code may not be the same developer who wrote the test. So we want to make things as direct and non-tricky as possible. Writing New Tests When we're adding new features, we want to create new tests for those features.

That means we'll often look at the tests that are already there so that we can hopefully create tests in the same style. If the tests are direct and obvious, it will be much easier for us to write new tests without having to go look for any "magic" that is going on in the Setup method.

In doing so, I've found that there are a few scenarios where I would still use a Setup or Teardown method. In a previous article Mocking Current Time with a Simple Time ProviderI had a static property that needed to be reset before each test would run.

I accomplished this with a Setup method: This sets the static "TimeProvider" property to a valid default value. The reason we need to do this is because static objects are shared across tests, so if a test overrides this value, then it may cause another test to fail if it is not reset. This has the effect of resetting the static "TimeProvider" property. Since we've set the property to automatically create the correct default time provider if it is "null", this code works just fine.

In fact, I think it works a little better because now we leave it up to the production code to figure out what the correct default value is. I still haven't updated this code in the project, but it's been on my mind for a few days. But the main point is that Setup and Teardown methods do still have their uses. In this case, it's a true "reset to default", and it makes sure that we don't have unexpected interactions between our tests.

Now, add the PrimeService class library as another dependency to the project. Use the dotnet add reference command: The following outline shows the final solution layout: Creating the first test The TDD approach calls for writing one failing test, making it pass, then repeating the process.

IsPrime 1 ; Assert.

Test Initialize and Test CleanUp in Coded UI

The [TestMethod] attribute indicates a method is a test method. Save this file and execute dotnet test to build the tests and the class library and then run the tests. The MSTest test runner contains the program entry point to run your tests. You haven't created the implementation yet. Make this test pass by writing the simplest code in the PrimeService class that works: The dotnet test command runs a build for the PrimeService project and then for the PrimeService.

After building both projects, it runs this single test.

Unit testing C# with MSTest and .NET Core - .NET Core | Microsoft Docs

Adding more features Now that you've made one test pass, it's time to write more. There are a few other simple cases for prime numbers: You could add new tests with the [TestMethod] attribute, but that quickly becomes tedious. There are other MSTest attributes that enable you to write a suite of similar tests. A [DataTestMethod]attribute represents a suite of tests that execute the same code but have different input arguments.

You can use the [DataRow] attribute to specify values for those inputs.

mstest testinitialize not called dating

Instead of creating new tests, apply these two attributes to create a single data driven test.