DO4: continuous integration and testing

I planned to write this for a long time ago. We use TeamCity to continuously build & test DataObjects.Net 4 assemblies. Currently there are:

Post-commit tests. Run after every commit for all dependent projects.

Pre-commit project for Xtensive.Storage. There are 6 tests configurations:
- Memory,
- PostgreSQL 8.2, 8.3, 8.4
- SQL Server 2005, 2008.

The tests there are running when pre-tested commit TeamCity feature is used.

Nightly tests. There are 6 projects (one per each RDBMS version we support: Memory, PostgreSQL 8.2, 8.3, 8.4, SQL Server 2005, 2008), and each of them is tested in 6 different configurations to check everything works in all mapping strategies we support. To achieve this, we use two special IModule implementations in our tests:
- InheritanceSchemaModifier: sets InheritanceSchema to the specified one for all the hierarchies of Domain it is used in. Usage of this module multiplies possible test configurations by 3 (for ClassTable, SingleTable and ConcreteTable).
- TypeIdModified: if specified, injects TypeId column in to any primary key. This is important, because injection of TypeId may significantly affect on fetch performance for hierarchies with deep inheritance; moreover, since TypeId is handled specially in many cases, this allows to check all this logic properly works if TypeId is injected into key. Usage of this module multiplies possible test configurations by 2 (with and without TypeId in keys).

As you see, this gives 6 test configurations per each project, so totally we have 36 nightly test configurations.

All these tests are running on 3 primary test agents, althought there are few additional ones - e.g. we have a special agent running on virtual machine dedicated to build DataObjects.Net v3.9, since it requires outdated version of Sandcastle Help File Builder and some other tools.

Few screenshots: