For all supported NUnit versions TeamCity tracks the tests and reports all the information on-the-fly (both in the web UI and your IDE). In real-time mode TeamCity Tests Tab on every test run within a build: its status, name, package, duration, and statistics.
TeamCity informs user about tests failure immediately and provides details on occurred errors on the Overview tab of Build Results Home Page. For each failed or ignored test TeamCity web UI provides a direct link to open it in your IDE.
Besides, TeamCity relieves a headache of running your tests under x86 process on the x64 machine by introducing an explicit specification of the platform and run-time environment versions. You can define whether you use .NET 1.1 and MSIL, x64 or x86 platform to use for .NET 2.0 version in TeamCity NUnit Test Launcher, NUnit for NAnt Build Runner, NUnit for MSBuild, sln2003, sln2005, sln2008.
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In order to support the real-time reporting test results, TeamCity should either run the tests using its own TeamCity NUnit Test Launcher or be able to interact with the .NET Testing Frameworks Support so it receives notifications on test events. Custom TeamCity-aware test runners are used to implement the bundled support for the testing frameworks.