Unable to run codecov with upload locally or on CircleCI

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I seem to have worked it out using the tox and CircleCI configuration files shown below. It seems that what really fixed things was having tox run the pytest-based tests with a coverage command, i.e.

coverage run -m pytest tests {posargs}

I assume that by doing this it correctly makes the test coverage reports available so that codecov can then do its thing.

tox.ini:

[tox]
envlist = py37
minversion = 3.3.0
isolated_build = true

[testenv]
passenv = CI CIRCLECI CIRCLE_* CODECOV_TOKEN
deps =
    codecov
    coverage
    opencv-python
    pytest
    scikit-image
commands =
    python setup.py check -m -s
    coverage run -m pytest tests {posargs}
    codecov

.circleci/config.yml:

jobs:
    build:
        docker:
            - image: circleci/python:3.7

        working_directory: ~/repo

        steps:
            - checkout

            - restore_cache:
                keys:
                    - v1-dependencies-{{ checksum "requirements.txt" }}
                    # fallback to using the latest cache if no exact match is found
                    - v1-dependencies-

            - run:
                name: install dependencies
                command: |
                    python3 -m venv venv
                    . venv/bin/activate
                    pip install -e .
                    pip install codecov
                    pip install coverage
                    pip install tox

            - save_cache:
                paths:
                    - ./venv
                key: v1-dependencies-{{ checksum "requirements.txt" }}

            - run:
                name: run tests
                command: |
                    . venv/bin/activate
                    tox

            - store_artifacts:
                path: test-reports
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