Add support for native TOML configuration

changelog/13743.feature.rst

@@ -0,0 +1,37 @@
+Added support for native TOML configuration files.
+
+While pytest, since version 6, supports configuration in ``pyproject.toml`` files under ``[tool.pytest.ini_options]``,
+it does so in an "INI compatibility mode", where all configuration values are treated as strings or list of strings.
+Now, pytest supports the native TOML data model.
+
+In ``pyproject.toml``, the native TOML configuration is under the ``[tool.pytest]`` table.
+
+.. code-block:: toml
+
+    # pyproject.toml
+    [tool.pytest]
+    minversion = "9.0"
+    addopts = ["-ra", "-q"]
+    testpaths = [
+        "tests",
+        "integration",
+    ]
+
+The ``[tool.pytest.ini_options]`` table remains supported, but both tables cannot be used at the same time.
+
+If you prefer to use a separate configuration file, or don't use ``pyproject.toml``, you can use ``pytest.toml`` or ``.pytest.toml``:
+
+.. code-block:: toml
+
+    # pytest.toml or .pytest.toml
+    [pytest]
+    minversion = "9.0"
+    addopts = ["-ra", "-q"]
+    testpaths = [
+        "tests",
+        "integration",
+    ]
+
+The documentation now shows configuration snippets in both TOML and INI formats, in a tabbed interface.
+
+See :ref:`config file formats` for full details.

changelog/13849.bugfix.rst

@@ -0,0 +1,2 @@
+Hidden ``.pytest.ini`` files are now picked up as the config file even if empty.
+This was an inconsistency with non-hidden ``pytest.ini``.

doc/en/conf.py

@@ -34,6 +34,7 @@
     "sphinx.ext.todo",
     "sphinx.ext.viewcode",
     "sphinx_removed_in",
+    "sphinx_inline_tabs",
     "sphinxcontrib_trio",
     "sphinxcontrib.towncrier.ext",  # provides `towncrier-draft-entries` directive
     "sphinx_issues",  # implements `:issue:`, `:pr:` and other GH-related roles

doc/en/deprecations.rst

@@ -845,20 +845,38 @@ that manipulate this type of file (for example, Jenkins, Azure Pipelines, etc.).
 Users are recommended to try the new ``xunit2`` format and see if their tooling that consumes the JUnit
 XML file supports it.
 
-To use the new format, update your ``pytest.ini``:
+To use the new format, update your configuration file:
 
-.. code-block:: ini
+.. tab:: toml
 
-    [pytest]
-    junit_family=xunit2
+    .. code-block:: toml
+
+        [pytest]
+        junit_family = "xunit2"
+
+.. tab:: ini
+
+    .. code-block:: ini
+
+        [pytest]
+        junit_family = xunit2
 
 If you discover that your tooling does not support the new format, and want to keep using the
 legacy version, set the option to ``legacy`` instead:
 
-.. code-block:: ini
+.. tab:: toml
+
+    .. code-block:: toml
+
+        [pytest]
+        junit_family = "legacy"
+
+.. tab:: ini
+
+    .. code-block:: ini
 
-    [pytest]
-    junit_family=legacy
+        [pytest]
+        junit_family = legacy
 
 By using ``legacy`` you will keep using the legacy/xunit1 format when upgrading to
 pytest 6.0, where the default format will be ``xunit2``.

doc/en/example/markers.rst

@@ -239,13 +239,21 @@ Registering markers
 
 Registering markers for your test suite is simple:
 
-.. code-block:: ini
+.. tab:: toml
 
-    # content of pytest.ini
-    [pytest]
-    markers =
-        webtest: mark a test as a webtest.
-        slow: mark test as slow.
+    .. code-block:: toml
+
+        [pytest]
+        markers = ["webtest: mark a test as a webtest.", "slow: mark test as slow."]
+
+.. tab:: ini
+
+    .. code-block:: ini
+
+        [pytest]
+        markers =
+            webtest: mark a test as a webtest.
+            slow: mark test as slow.
 
 Multiple custom markers can be registered, by defining each one in its own line, as shown in above example.
 

doc/en/example/pythoncollection.rst

@@ -88,13 +88,21 @@ Example:
 Changing directory recursion
 -----------------------------------------------------
 
-You can set the :confval:`norecursedirs` option in an ini-file, for example your ``pytest.ini`` in the project root directory:
+You can set the :confval:`norecursedirs` option in a configuration file:
 
-.. code-block:: ini
+.. tab:: toml
 
-    # content of pytest.ini
-    [pytest]
-    norecursedirs = .svn _build tmp*
+    .. code-block:: toml
+
+        [pytest]
+        norecursedirs = [".svn", "_build", "tmp*"]
+
+.. tab:: ini
+
+    .. code-block:: ini
+
+        [pytest]
+        norecursedirs = .svn _build tmp*
 
 This would tell ``pytest`` to not recurse into typical subversion or sphinx-build directories or into any ``tmp`` prefixed directory.
 
@@ -108,14 +116,25 @@ the :confval:`python_files`, :confval:`python_classes` and
 :confval:`python_functions` in your :ref:`configuration file <config file formats>`.
 Here is an example:
 
-.. code-block:: ini
+.. tab:: toml
+
+    .. code-block:: toml
 
-    # content of pytest.ini
-    # Example 1: have pytest look for "check" instead of "test"
-    [pytest]
-    python_files = check_*.py
-    python_classes = Check
-    python_functions = *_check
+        # Example 1: have pytest look for "check" instead of "test"
+        [pytest]
+        python_files = ["check_*.py"]
+        python_classes = ["Check"]
+        python_functions = ["*_check"]
+
+.. tab:: ini
+
+    .. code-block:: ini
+
+        # Example 1: have pytest look for "check" instead of "test"
+        [pytest]
+        python_files = check_*.py
+        python_classes = Check
+        python_functions = *_check
 
 This would make ``pytest`` look for tests in files that match the ``check_*
 .py`` glob-pattern, ``Check`` prefixes in classes, and functions and methods
@@ -152,12 +171,21 @@ The test collection would look like this:
 
 You can check for multiple glob patterns by adding a space between the patterns:
 
-.. code-block:: ini
+.. tab:: toml
+
+    .. code-block:: toml
+
+        # Example 2: have pytest look for files with "test" and "example"
+        [pytest]
+        python_files = ["test_*.py", "example_*.py"]
 
-    # Example 2: have pytest look for files with "test" and "example"
-    # content of pytest.ini
-    [pytest]
-    python_files = test_*.py example_*.py
+.. tab:: ini
+
+    .. code-block:: ini
+
+        # Example 2: have pytest look for files with "test" and "example"
+        [pytest]
+        python_files = test_*.py example_*.py
 
 .. note::
 
@@ -178,14 +206,22 @@ example if you have unittest2 installed you can type:
     pytest --pyargs unittest2.test.test_skipping -q
 
 which would run the respective test module.  Like with
-other options, through an ini-file and the :confval:`addopts` option you
+other options, through a configuration file and the :confval:`addopts` option you
 can make this change more permanently:
 
-.. code-block:: ini
+.. tab:: toml
+
+    .. code-block:: toml
+
+        [pytest]
+        addopts = ["--pyargs"]
+
+.. tab:: ini
 
-    # content of pytest.ini
-    [pytest]
-    addopts = --pyargs
+    .. code-block:: ini
+
+        [pytest]
+        addopts = --pyargs
 
 Now a simple invocation of ``pytest NAME`` will check
 if NAME exists as an importable package/module and otherwise
@@ -224,11 +260,19 @@ Customizing test collection
 
 You can easily instruct ``pytest`` to discover tests from every Python file:
 
-.. code-block:: ini
+.. tab:: toml
+
+    .. code-block:: toml
+
+        [pytest]
+        python_files = ["*.py"]
+
+.. tab:: ini
+
+    .. code-block:: ini
 
-    # content of pytest.ini
-    [pytest]
-    python_files = *.py
+        [pytest]
+        python_files = *.py
 
 However, many projects will have a ``setup.py`` which they don't want to be
 imported. Moreover, there may files only importable by a specific python

doc/en/example/simple.rst

@@ -11,11 +11,19 @@ every time you use ``pytest``.  For example, if you always want to see
 detailed info on skipped and xfailed tests, as well as have terser "dot"
 progress output, you can write it into a configuration file:
 
-.. code-block:: ini
+.. tab:: toml
 
-    # content of pytest.ini
-    [pytest]
-    addopts = -ra -q
+    .. code-block:: toml
+
+        [pytest]
+        addopts = ["-ra", "-q"]
+
+.. tab:: ini
+
+    .. code-block:: ini
+
+        [pytest]
+        addopts = -ra -q
 
 
 Alternatively, you can set a ``PYTEST_ADDOPTS`` environment variable to add command
@@ -29,7 +37,7 @@ Here's how the command-line is built in the presence of ``addopts`` or the envir
 
 .. code-block:: text
 
-    <pytest.ini:addopts> $PYTEST_ADDOPTS <extra command-line arguments>
+    <configuration file addopts> $PYTEST_ADDOPTS <extra command-line arguments>
 
 So if the user executes in the command-line:
 

doc/en/explanation/goodpractices.rst

@@ -94,14 +94,21 @@ This has the following benefits:
 
 For new projects, we recommend to use ``importlib`` :ref:`import mode <import-modes>`
 (see which-import-mode_ for a detailed explanation).
-To this end, add the following to your ``pyproject.toml``:
+To this end, add the following to your configuration file:
 
-.. code-block:: toml
+.. tab:: toml
+
+    .. code-block:: toml
+
+        [pytest]
+        addopts = ["--import-mode=importlib"]
+
+.. tab:: ini
+
+    .. code-block:: ini
 
-    [tool.pytest.ini_options]
-    addopts = [
-        "--import-mode=importlib",
-    ]
+        [pytest]
+        addopts = --import-mode=importlib
 
 .. _src-layout:
 
@@ -126,12 +133,21 @@ which are better explained in this excellent `blog post`_ by Ionel Cristian Măr
        PYTHONPATH=src pytest
 
     or in a permanent manner by using the :confval:`pythonpath` configuration variable and adding the
-    following to your ``pyproject.toml``:
+    following to your configuration file:
 
-    .. code-block:: toml
+    .. tab:: toml
+
+        .. code-block:: toml
+
+            [pytest]
+            pythonpath = ["src"]
+
+    .. tab:: ini
+
+        .. code-block:: ini
 
-        [tool.pytest.ini_options]
-        pythonpath = "src"
+            [pytest]
+            pythonpath = src
 
 .. note::