Failed to run unit test for balancer contract by using truffle

[KamiD]

System info: [Include Ethermint commit, operating system name, and other relevant details]

• OS: MacOS 10.15.3
• Commit id: 177574a

Steps to reproduce:

1. [First Step]
   run local node
2. [Second Step]
   download contract code of balancer from here: https://github.com/balancer-labs/balancer-core.git
3. [and so on...]
   open terminal, cd to dir balancer-core, execute cmd yarn test

Expected behavior: [What you expected to happen]
all unit test passed

Actual behavior: [What actually happened]
all unit test failed

Additional info: [Include gist of relevant config, logs, etc.]

[github-actions]

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