System.Uri.ToString behaviour change after VS2012 install

Question

After installing VS2012 Premium on a dev machine a unit test failed, so the developer fixed the issue. When the changes were pushed to TeamCity the unit test failed. The pro

Answer 1

There are some changes introduced in .NET Framework 4.5, which is installed along with VS2012, and which is also (to the best of my knowledge) a so called "in place upgrade". This means that it actually upgrades .NET Framework 4.

Furthermore, there are breaking changes documented in System.Uri. One of them says Unicode normalization form C (NFC) will no longer be performed on non-host portions of URIs. I am not sure whether this is applicable to your case, but it could serve as a good starting point in your investigation of the error.