Where is the "test" button?

The unit test gurus recommend that we always code a little, run tests,
code some more, test again, etc.  That suggests that test execution is a
task that should be more frequently run than say, executing the project
or debugging it.  Shouldn't we therefore have a "Run Unit Tests" button
in the Build toolbar?  Toolbar space is limited, but if unit testing is
supposed to be a frequently executed task then it should be on the
toolbar.

I think this is an important requirement for 4.0, since unit test
support is much more important in this release.

Tom