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Visual T# is a unit tests development environment integrated within Visual Studio™, though it can also be used indepedently from it. It is composed of :

• T# : a programming language specific to unit tests. T# is based on the C#™ 2.0 language, which makes it a natural fit for .NET developers. New reserved keywords have been added to simplify the writing of unit tests. It puts a lot of emphasis on unambiguously defining tests' intentions.
• Tools for compiling tests, executing them, testing them and easily navigating amongst them.

• Transparent usage of best practices : clearly identifies the three parts inherent to a test (Preparation, Execution, Verification).
• Fast problems identification : tests that are not well constructed are separated from those that actually failed.
• Easy validation specification : one keyword assert to handle all the cases.
• Effective debugging : tests concerning a working declaration can be executed without knowing where they have been declared.
• Usage of different contexts: reexecute tests for different contexts without rewriting them.
• Indication of missing logical tests: missing logical tests are indicated upon compilation of the test code.
• Simplified writing: each verification can be expressed in one line of code (this also holds for events, exceptions, etc.), use relative verifications.