show-fixture-duplicates

If you have already installed pytest-fixture-tools plugin then you can use one of its commands.

--show-fixture-duplicates - will collect all fixtures and print you a list of duplicates for each fixture.

With --show-fixture-duplicates you can use --fixture name_of_fixture option to get list of duplicates only for specific fixture

py.test tests/ --show-fixture-duplicates --fixture order

Output can look like this:

========================================== test session starts ==========================================
platform linux2 -- Python 2.7.3 -- pytest-2.5.1 -- /home/batman/.virtualenvs/arkham-city/bin/python
Tests are shuffled using seed number 355495648184.
cachedir: /home/batman/.virtualenvs/arkham-city/.cache
plugins: fixture-tools, random, bdd-splinter, pep8, cov, contextfixture, bdd, xdist, instafail, cache
collected 2347 items / 1 skipped

------------------------------------------------- order -------------------------------------------------
tests/fixtures/order.py:30
tests/unit/api/conftest.py:261

fixture-graph

You can generate the usage fixture graph like that:

# on windows gitbash as example
export PATH=$PATH:/c/Program\ Files\ \(x86\)/Graphviz2.38/bin/
pytest --fixture-graph -s

# or you can select the output direcotry like that:
pytest --fixture-graph --fixture-graph-output-dir=./test_output

# you can also change the output type of the graphs (any of graphvis supported outputs types):
pytest --fixture-graph --fixture-graph-output-type=jpg

The output would be like that:

============================= test session starts =============================
platform win32 -- Python 2.7.10, pytest-3.3.1, py-1.5.2, pluggy-0.6.0
rootdir: C:\Users\ifruchte\Projects\pytest-fixture-tools, inifile: tox.ini
plugins: pep8-1.0.6, cov-2.5.1, fixture-tools-1.0.0
collected 7 items

pytest_fixture_tools\__init__.py .                                       [ 14%]
pytest_fixture_tools\plugin.py .                                         [ 28%]
tests\__init__.py .                                                      [ 42%]
tests\conftest.py .                                                      [ 57%]
tests\test_fixture_duplicates.py .
-------------------------------- fixture-graph --------------------------------
created artifacts/fixture-graph-tests-test_fixture_duplicates.py__test_there_are_fixture_duplicates.png.
============================= test session starts =============================
platform win32 -- Python 2.7.10, pytest-3.3.1, py-1.5.2, pluggy-0.6.0
rootdir: c:\users\ifruchte\appdata\local\temp\pytest-of-ifruchte\pytest-445\test_there_are_not_fixture_duplicates0, inifile:
plugins: pep8-1.0.6, cov-2.5.1, fixture-tools-1.0.0
collected 2 items

======================== no tests ran in 0.06 seconds =========================
.s                                     [100%]

===================== 6 passed, 1 skipped in 0.29 seconds =====================

Final output, that can help with tests that depend on large amount of fixtures: