What are these tests for ?

[ICONationDevTeam]

curve-contract/tests/pools/common/unitary/test_claim_fees.py

Lines 19 to 27 in b0bbf77

	for i in (sending, receiving):
	if wrapped_coins[i] == ETH_ADDRESS:
	admin_fee = swap.balance() - swap.balances(i)
	assert admin_fee + swap.balances(i) == swap.balance()
	else:
	admin_fee = wrapped_coins[i].balanceOf(swap) - swap.balances(i)
	assert admin_fee + swap.balances(i) == wrapped_coins[i].balanceOf(swap)
	assert admin_fee > 0

In simpler terms :

admin_fee = A - B

and the test is :

admin_fee + B == A

Whatever swap.balance() and swap.balances(i) returns, the result will always be true.