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Felecarpp
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Hello,
I need to create relationships between my entities in my project. I have read this thread (#62) and I would like to propose a way to build them using esper.
The key idea is to add a same component instance (called a group) to many entities. This works already fine with esper but not any test assure it over the long-term. So this PR only adds unit tests.

add a test suite to check a relationship implementation works
this adds a constraint on esper because this implementation use a same component instance (called group) for many entities
@Felecarpp
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Finally, I found another way to implement it which don't need to add the same instance of a component to many entities.

the first idea

item 1 character item 2
Inventory <-- Hold Inventory (the same instance)

the new one

item 1 character item 2
Belong --> Inventory <-- Belong

for the farm/plant question (#79)

plant 1 farm plant 2
Rooted --> Plantation <-- Rooted

The only oddity remaining is that a component has another component as an attribute. This allows to do not use an entity ID instead or to use a complex identifier system.

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