1
Web3js contracts use the ABI to know how to make calls to contract functions, it needs parameters and types to properly encode it. If you try to call a function that is not present in the ABI it will complain about missing function.
You have two possible solutions:
Use a contract with the correct ABI but use proxy address instead.
Use sendTransaction and ...
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Answering the question in the title (How to test a custom fallback function using web3.js?):
await web3.eth.sendTransaction({
from: accounts[1],
to: proxy.address,
value: web3.utils.toWei('0.02', 'ether')
});
I'm assuming that accounts[1] is unlocked on the node that you're connected to.
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