<p>I'm trying to be better about unit testing my code, but right now I'm writing a lot of code that deals with remote systems.  SNMP, WMI, that sort of thing.  With most classes I can mock up objects to test them, but how do you deal with unit testing a real system?  For example, if my class goes out and gets the Win32_LogicalDisk object for a server, how could I possibly unit test it?</p>

Assuming you meant "How do I test against things that are hard/impossible to mock":
If you have a class that "goes out and gets the Win32_LogicalDisk object for a server" AND does something else (consumes the 'Win32_LogicalDisk' object in some way), assuming you want to test the pieces of the class that consume this object, you can use
Dependency Injection
to allow you to mock the 'Win32_LogicalDisk' object.  For instance:
```
```
class LogicalDiskConsumer(object):

    def __init__(self, arg1, arg2, LogicalDiskFactory)
        self.arg1=arg1
        self.arg2=arg2
        self.LogicalDisk=LogicalDiskFactory()

    def consumedisk(self):
        self.LogicalDisk.someaction()
```
```
Then in your unit test code, pass in a 'LogicalDiskFactory' that returns a mock object for the 'Win32_LogicalDisk'.