Tests run from Team Build can't find referenced assemblies

I know I've seen this answered before but...

I have a Team Build of a solution with 9 projects - an EXE, 4 class libraries and 4 test projects. The team build is configured to run tests. When the builder attempts to build the test projects, it get compiler errors because it can't resolve names in the class library projects, even though those projects built successfully.

What do I have to do to get my test projects to build in the team build environment?

[476 byte] By [CarlDaniel] at [2007-12-16]