Test cases for jelly object 
serialization.
| Class | TestNode | An object to test jellyfying of new style class instances. | 
| Class | A | Dummy class. | 
| Function | afunc | A dummy function to test function serialization. | 
| Class | B | Dummy class. | 
| Class | C | Dummy class. | 
| Class | D | Dummy new-style class. | 
| Class | E | Dummy new-style class with slots. | 
| Class | SimpleJellyTest | Undocumented | 
| Class | JellyTests | Testcases for jellymodule serialization. | 
| Class | JellyDeprecationTests | Tests for deprecated Jelly things | 
| Class | ClassA | Undocumented | 
| Class | ClassB | Undocumented | 
| Class | CircularReferenceTests | Tests for circular references handling in the jelly/unjelly process. |