Other errors in tests

Unloadable or unexecutable test.

```
A Failure case is placed in a test suite to indicate the presence of a
test that could not be loaded or executed. A common example is a test
module that fails to import.
```
- runTest (ERROR)
# 

ERROR: Failure: ImportError (cannot import name ShouldNotSatisfied)
ERROR: Failure: ImportError (No module named fluidity.machine)
