Lack some test cases for Proxy/Agent/Mutant contracts

[ashuralyk]

Description

after refactoring of contract test cases, I found we lack some for checking vulnerability of proxy, agent and mutant contracts

Task list

current stage

• check transferring of cluster cell
• check transferring of proxy cell
• check burning of proxy cell
• check transferring of agent cell
• check burning of agent cell
• check minting spore from agent

next stage

• check creation of spore cell with mutant cell
• check transfer action of spore cell with mutant cell
• check burning action of spore cell with mutant cell
• check mutant feature with complex Lua script

[ashuralyk]

test cases for current stage are completed in here: #44