Tox WARNING:test command found but not installed in testenv

Question

I am using tox for my project.

Here is my tox.ini file:

[tox]
envlist =
    py27,
    lint,
    coverage

skipsdist = True

[testenv:py27]
deps = -rrequirements.txt
commands = python -m unittest discover -s ./tests

[testenv:coverage]
commands =
    coverage run --source=tests -m unittest discover -s tests/
    coverage html
    coverage report


[testenv:lint]
commands = pylint ./foo

whenever I run tox, everything is getting executed which basically is linting, coverage.

but Tox is displaying warning for everything.

WARNING:test command found but not installed in testenv
Maybe you forgot to specify a dependency? See also the whitelist_externals envconfig setting.

Everything succeeds, but it is still displaying warning and errors. Can anyone tell me to what I am doing wrong?

My requirements.txt file is this:

requests==2.18.4
JsonForm==0.0.2
jsonify==0.5
jsonschema==2.6.0
JsonSir==0.0.2
python-dateutil==1.5
DateTime==4.2
urllib3==1.22
contextlib2==0.5.5
mock==2.0.0
patch==1.16

Answer 1

Programs that you use in commands must either be installed in tox' virtual environment or whitelisted:

[tox]
envlist =
    py27,
    lint,
    coverage

skipsdist = True

[testenv:py27]
deps = -rrequirements.txt
whitelist_externals = python
commands = python -m unittest discover -s ./tests

[testenv:coverage]
whitelist_externals = coverage
commands =
    coverage run --source=tests -m unittest discover -s tests/
    coverage html
    coverage report


[testenv:lint]
whitelist_externals = pylint
commands = pylint ./foo

Answer 2

As specified by the error use:

whitelist_externals = <your command>

e.g. my external command is curl then tox.ini looks like

[tox]
envlist = py3
isolated_build = True

[testenv]
whitelist_externals = curl
deps =
    pytest
    chispa
    pyspark
    requests
    requests-mock
commands =
    curl url/hadoop-aws-3.2.0.jar --output ../lib/jars/hadoop-aws-3.2.0.jar
    curl url/aws-sdk-java-2.jar --output ../lib/jars/aws-sdk-java-2.jar
    python3 -m pytest

Answer 3

From the tox docs:

whitelist_externals has the same meaning and usage as allowlist_externals but it is now deprecated.

---

Since no one didn't mention it yet, I'll introduce allowlist_externals solution

Running tox in a virtual environment (python virtualenv) threw me warnings:

WARNING: test command found but not installed in testenv
Maybe you forgot to specify a dependency? See also the allowlist_externals envconfig setting.

The only command tox executed was commands = pytest --basetemp={envtmpdir}

---

Following the warning hint I went and check allowlist_externals which allows us to define which command can be used in the commands section without triggering "not installed in virtualenv" warnings

---

My final tox.ini [testenv] looked like this:

...
[testenv]
allowlist_externals = pytest
setenv =
    PYTHONPATH = {toxinidir}
deps =
    -r{toxinidir}\requirements_test_no_conflicts.txt
commands = 
    pytest --basetemp={envtmpdir}
...

---

As a side note: allowlist_externals can be used in different tox.ini sections