Test-Driven Development in Microsoft .NET

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Therefore, unit test code for TDD is usually written within the same project or module as the code being tested. In object oriented design this still does not provide access to private data and methods. Therefore, extra work may be necessary for unit tests. In Java and other languages, a developer can use reflection to access private fields and methods.


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In the. NET Framework and some other programming languages, partial classes may be used to expose private methods and data for the tests to access. It is important that such testing hacks do not remain in the production code. This means the released code is not exactly the same as what was unit tested. The regular running of fewer but more comprehensive, end-to-end, integration tests on the final release build can ensure among other things that no production code exists that subtly relies on aspects of the test harness. There is some debate among practitioners of TDD, documented in their blogs and other writings, as to whether it is wise to test private methods and data anyway.

Some argue that private members are a mere implementation detail that may change, and should be allowed to do so without breaking numbers of tests. Thus it should be sufficient to test any class through its public interface or through its subclass interface, which some languages call the "protected" interface.

Business Need

Developers may use computer-assisted testing frameworks , commonly collectively named xUnit which are derived from SUnit, created in , to create and automatically run the test cases. These capabilities are critical for automation as they move the burden of execution validation from an independent post-processing activity to one that is included in the test execution. The execution framework provided by these test frameworks allows for the automatic execution of all system test cases or various subsets along with other features.

Testing frameworks may accept unit test output in the language-agnostic Test Anything Protocol created in Unit tests are so named because they each test one unit of code. A complex module may have a thousand unit tests and a simple module may have only ten. The unit tests used for TDD should never cross process boundaries in a program, let alone network connections.

Doing so introduces delays that make tests run slowly and discourage developers from running the whole suite. Introducing dependencies on external modules or data also turns unit tests into integration tests. If one module misbehaves in a chain of interrelated modules, it is not so immediately clear where to look for the cause of the failure. When code under development relies on a database, a web service, or any other external process or service, enforcing a unit-testable separation is also an opportunity and a driving force to design more modular, more testable and more reusable code.

Fake and mock object methods that return data, ostensibly from a data store or user, can help the test process by always returning the same, realistic data that tests can rely upon. They can also be set into predefined fault modes so that error-handling routines can be developed and reliably tested.


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  5. In a fault mode, a method may return an invalid, incomplete or null response, or may throw an exception. Fake services other than data stores may also be useful in TDD: A fake encryption service may not, in fact, encrypt the data passed; a fake random number service may always return 1.

    Hybrid Test-Driven Development

    Fake or mock implementations are examples of dependency injection. A Test Double is a test-specific capability that substitutes for a system capability, typically a class or function, that the UUT depends on. There are two times at which test doubles can be introduced into a system: link and execution.

    Link time substitution is when the test double is compiled into the load module, which is executed to validate testing. This approach is typically used when running in an environment other than the target environment that requires doubles for the hardware level code for compilation. The alternative to linker substitution is run-time substitution in which the real functionality is replaced during the execution of a test case.

    This substitution is typically done through the reassignment of known function pointers or object replacement. A corollary of such dependency injection is that the actual database or other external-access code is never tested by the TDD process itself.

    See a Problem?

    To avoid errors that may arise from this, other tests are needed that instantiate the test-driven code with the "real" implementations of the interfaces discussed above. These are integration tests and are quite separate from the TDD unit tests. There are fewer of them, and they must be run less often than the unit tests. They can nonetheless be implemented using the same testing framework. Integration tests that alter any persistent store or database should always be designed carefully with consideration of the initial and final state of the files or database, even if any test fails.

    This is often achieved using some combination of the following techniques:. Exercising TDD on large, challenging systems requires a modular architecture, well-defined components with published interfaces, and disciplined system layering with maximization of platform independence. These proven practices yield increased testability and facilitate the application of build and test automation.

    Complex systems require an architecture that meets a range of requirements. A key subset of these requirements includes support for the complete and effective testing of the system. Effective modular design yields components that share traits essential for effective TDD. A key technique for building effective modular architecture is Scenario Modeling where a set of sequence charts is constructed, each one focusing on a single system-level execution scenario. The Scenario Model provides an excellent vehicle for creating the strategy of interactions between components in response to a specific stimulus.

    Each of these Scenario Models serves as a rich set of requirements for the services or functions that a component must provide, and it also dictates the order that these components and services interact together.

    Scenario modeling can greatly facilitate the construction of TDD tests for a complex system. In a larger system the impact of poor component quality is magnified by the complexity of interactions. This magnification makes the benefits of TDD accrue even faster in the context of larger projects. However, the complexity of the total population of tests can become a problem in itself, eroding potential gains.

    It sounds simple, but a key initial step is to recognize that test code is also important software and should be produced and maintained with the same rigor as the production code. Creating and managing the architecture of test software within a complex system is just as important as the core product architecture. Test drivers interact with the UUT, test doubles and the unit test framework. From Wikipedia, the free encyclopedia. This section needs additional citations for verification.

    Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Acceptance testing Behavior-driven development Design by contract Inductive programming Integration testing List of software development philosophies List of unit testing frameworks Mock object Programming by example Sanity check Self-testing code Software testing Test case Transformation Priority Premise Unit testing Continuous test-driven development.


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    Retrieved December 1, Test-Driven Development by Example. And, as members of the development team for NUnit, a leading unit-testing framework for Microsoft.

    Test-Driven Development in Microsoft .NET - PDF Free Download

    NET, the authors can offer matchless insights on testing in this environmentultimately making their expertise your own. Test firstand drive ambiguity out of the development process: Document your code with tests, rather than paper Use test lists to generate explicit requirements and completion criteria Refactorand improve the design of existing code Alternate programmer tests with customer tests Change how you build UI codea thin layer on top of rigorously tested code Use tests to make small, incremental changesand minimize the debugging process Deliver software that's verifiable, reliable, and robust.

    Bloggat om Test-Driven Development in Microsoft. Test Push null onto the Stack, Pop the Stack, and verify that the value returned is null. Test Push null onto the Stack, call Top, and verify that the value returned is null. Summary 3. Test-Driven Development Example 4. Retrieve an existing recording and verify its content Script 2.

    The Solution Summary Appendixes A. Create Visual Studio Project for your test code. Step 2. Add a reference to the NUnit Framework. Step 3.

    Get some hands-on practice with test-driven development in C#

    Add a class to the project. Step 4. Step 5.