Almost. You at least need to exercise the code at compile time. For example you could write dummy usage tests like this:

typeof(MyClass.new.some_method(1, 2, 3))

That basically says "the above compiles and has some type", so you don't have to test what that method really does, just that it compiles.

I don't think it's a big problem, though. In Ruby it's the same: unless you exercise your code you don't know if it works. Now, think of a classically compiled language like C and C++: if it compiles, does it mean that it works? I doubt you'd release your code without at least a few tests (or a small test-app) to try it.