Automate Test Strategy by pmn55698

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									MS Test 101
            Overview

 What is MS Test?
    What does an MS Test look like?

 Developing with MS Test
    Setting up a MS Test project
    Writing Unit Tests with MS Test
    Running Tests
    Demo

 Unit Testing Strategy and Tactics
    Benefits of writing automated Tests
    Building Resilient Tests
    To Automate or Not to Automate
   Test Driven Development

 Conclusion / References / Questions?
         What is MS Test?

 MS Test is Microsoft’s collection of class libraries that
facilitate automated testing.
   This set of class libraries is integrated with Visual Studio 2008:
       Unit Test File Types
       Test Project Type
       Integration with MSBuild, support for targeted environments…

 Basic functionality and support is included with all versions
of Visual Studio 2008
   More advanced features such as Web UI testing are supported in
   Visual Studio for Testers
   Think record test, the point and click, in your browser…

Like all things .NET, an MS Test is just a class
    using Microsoft.VisualStudio.TestTools.UnitTesting;
What does a MS Test Look Like?
 Setting up a MS Test project
 Writing Unit Tests with MS Test
 Running Tests
 A Few Notes Behind The Scenes…
 Demo
         Setting up a MS Test Project

 Place tests in a separate project
    I usually use something like: “AssemblyName.Tests”
    Or “AssemblyName.WebService.Tests” if tests are only for the
   webservice


 Can have more than one test project per solution

 Depending on the number of tests, may be a good idea
to have 1:1 project to test project ratio.

 Use the InternalsVisibleTo assembly attribute
    Place in AssemblyInfo.cs to allow your test library to see internal
   classes/methods.
Setting up a MS Test Project
           Writing Unit Tests with MS Test


Write small unit tests that test individual bits of functionality
   Features are often interdependent, but try to test the smallest subset possible.

It is acceptable to call other test methods to reuse code…
   Any failure of an Assert method will cause the current test to fail…

 Abstract test code wherever possible…
    Break out duplicate code into private or protected methods.
    Inherit from abstract classes.
    Initialize class attributes can be located in abstract base classes…

Don’t check in code or tests that do not pass…
   Use the [Ignore()] attribute instead
            Writing Unit Tests with MS Test

Make the order of unit test execution independent
   Although you can order unit tests (not covered in this presentation) unit tests
   should be able to be run in any order.
   For dependent steps, use [TestInitialize] or [ClassInitialize] attributes.


Make the execution of unit tests independent
   Do not make the test depend on functionality in the app being tested to run.
   E.g. Do not use functionality in the app to retrieve some information, then use
   that information to initiate a test of the desired functionality.
   Problems in other areas of the app could mask the real source of the issue.

Automated Generation of Unit Tests
   Nice Toy, but take care
   Very generic, and generally do not execute perfectly the first time.
A peek at the subject class…
Writing Unit Tests with MS Test
Writing Unit Tests with MS Test
      Running Tests with MS Test

The MS Test Toolbar
      Running Tests with MS Test

Test Results Window
      Running Tests with MS Test

Individual Test Results Window
       A few notes behind the scenes…

Test Results
Live Demo
 Benefits of writing automated Tests
 Test Driven Development
 Building Resilient Tests
 To Automate or Not to Automate
           Benefits of Writing Automated Tests

Known baseline – We know the tests passed!

Faster verification of functionality

More frequent verification of functionality
   Can be chained with an automated build for CI

Forces work to be done in smaller increments
   Smaller more focused, modular, and decoupled classes

Greater trust in the code for all involved

Fewer code defects, defects are detected faster…
    Test Driven Development


                            Add A Test




                                                            Watch the
Refactor code
                                                           new test fail




             Watch the
            new test pass                Write some code
          Building Resilient Tests


 Inevitably your tests will probably depend on certain data
being returned from the database.

 This data is often an unknown, and can change.

 Try not to make your tests depend on a single DB value

 A better approach is to retrieve a collection of results.
   Then iterate through the results until you find a match indicating that
   the code functions properly.
   Flag a Boolean as true, and Assert this value.
          To Automate or not to Automate


The answer should be to automate…

Sometimes the answer is not to automate, but a great effort
should be made to automate…
   You have the life of the product to recoup the investment…

Once you accept that one test is not automated, it is far too
tempting not to automate others.
   If all is automated, you have one-click verification of proper
   functionality…
                    Conclusion / Reference / Questions?
Conclusions
     Automated testing saves you time!
     Automated testing increases the number of times software is tested,
    increases quality as a result.
    Automated testing can improve the modularity of an application.

References
    Test Driven Development from Wikipedia (Must Read!!!)
     http://en.wikipedia.org/wiki/Test-driven_development
    Famous Continuous Integration Article by Martin Fowler (Must Read!)
     http://martinfowler.com/articles/continuousIntegration.html

    Assert Class Members:
    http://msdn2.microsoft.com/en-us/library/microsoft.visualstudio.testtools.unittesting.assert_members(VS.80).aspx



Any Questions? – Feel free to consult with me on your specific project…

								
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