Hey @abcoathup and thanks for your answer.
I am building in Solidity 0.5.17 at the moment and, as far as I understand this is a release for sol 0.7;
I have tested the contract and I do confirm that go() is called (I do have a variable inside that gets the value 5 when go is called).
Still cannot wrap my mind around the admin revert.
In the proxy contract I have created a getter method (view) that returns the admin of the proxy.
function getAdmin () public view returns (address){
return _admin();
}
it("Should not allow the proxy admin to call this function", async () => {
let admin = await proxy.getAdmin();
console.log('calling a fallback function from: ' + admin)
let res = await proxyControl.getTestVar({from:admin});
assert.equal(res.toNumber(),5);
})