brownie test: "import file mismatch"

[eliotstock]

Environment information

• curve-contract branch/commit: master/latest
• brownie Version: 1.14.5
• ganache-cli Version: 6.12.2
• OS: linux

What was wrong?

Please include information like:

• what you are trying to accomplish: run tests
• which command(s) you ran: brownie test
• the code that caused the failure:
  /tests/pools/common/unitary/test_exchange_reverts.py
  /tests/pools/eth/test_exchange_reverts.py
• output:
  (curve-venv) $brownie test
  Brownie v1.14.5 - Python development framework for Ethereum

Compiling contracts...
Solc version: 0.5.17
Optimizer: Enabled Runs: 200
EVM Version: Istanbul
Generating build data...

• AaveLendingPoolMock
• IERC20
• aToken
• ATokenMock
• IERC20
• SafeMath

================================================================================================================================== test session starts ===================================================================================================================================
platform linux -- Python 3.9.5, pytest-6.0.1, py-1.10.0, pluggy-0.13.1
rootdir: /home/e/r/[removed]/curve-venv/curve-contract
plugins: eth-brownie-1.14.5, xdist-1.34.0, forked-1.3.0, hypothesis-5.41.3, web3-5.11.1
collected 14564 items / 2 errors / 14562 selected

Launching 'ganache-cli --port 8545 --gasLimit 12000000 --accounts 10 --hardfork istanbul --mnemonic brownie --defaultBalanceEther 10000'...

========================================================================================================================================= ERRORS =========================================================================================================================================
_______________________________________________________________________________________________________________ ERROR collecting tests/pools/eth/test_exchange_reverts.py ________________________________________________________________________________________________________________
import file mismatch:
imported module 'test_exchange_reverts' has this file attribute:
/home/e/r/[removed]/curve-venv/curve-contract/tests/pools/common/unitary/test_exchange_reverts.py
which is not the same as the test file we want to collect:
/home/e/r/[removed]/curve-venv/curve-contract/tests/pools/eth/test_exchange_reverts.py
HINT: remove pycache / .pyc files and/or use a unique basename for your test file modules
__________________________________________________________________________________________________ ERROR collecting tests/zaps/meta/integration/test_remove_liquidity_imbalance_zap.py ___________________________________________________________________________________________________
import file mismatch:
imported module 'test_remove_liquidity_imbalance_zap' has this file attribute:
/home/e/r/[removed]/curve-venv/curve-contract/tests/zaps/common/test_remove_liquidity_imbalance_zap.py
which is not the same as the test file we want to collect:
/home/e/r/[removed]/curve-venv/curve-contract/tests/zaps/meta/integration/test_remove_liquidity_imbalance_zap.py
HINT: remove pycache / .pyc files and/or use a unique basename for your test file modules

How can it be fixed?

No idea.

I'm using a venv, as instructed.

Note that I'm using Python 3.9.5 and you currently require 3.6 to 3.8, but this doesn't seem like a Python issue.