Add 'int' and 'float' ini option types

Fixes #11381

---------

Co-authored-by: Bruno Oliveira <bruno@soliv.dev>
Co-authored-by: Florian Bruhin <me@the-compiler.org>

changelog/11381.improvement.rst

@@ -0,0 +1,17 @@
+The ``type`` parameter of the ``parser.addini`` method now accepts `"int"` and ``"float"`` parameters, facilitating the parsing of configuration values in the configuration file.
+
+Example:
+
+.. code-block:: python
+
+  def pytest_addoption(parser):
+      parser.addini("int_value", type="int", default=2, help="my int value")
+      parser.addini("float_value", type="float", default=4.2, help="my float value")
+
+The `pytest.ini` file:
+
+.. code-block:: ini
+
+  [pytest]
+  int_value = 3
+  float_value = 5.4

src/_pytest/config/__init__.py

@@ -1587,6 +1587,8 @@ def getini(self, name: str):
         ``paths``, ``pathlist``, ``args`` and ``linelist`` : empty list ``[]``
         ``bool`` : ``False``
         ``string`` : empty string ``""``
+        ``int`` : ``0``
+        ``float`` : ``0.0``
 
         If neither the ``default`` nor the ``type`` parameter is passed
         while registering the configuration through
@@ -1605,9 +1607,11 @@ def getini(self, name: str):
 
     # Meant for easy monkeypatching by legacypath plugin.
     # Can be inlined back (with no cover removed) once legacypath is gone.
-    def _getini_unknown_type(self, name: str, type: str, value: str | list[str]):
-        msg = f"unknown configuration type: {type}"
-        raise ValueError(msg, value)  # pragma: no cover
+    def _getini_unknown_type(self, name: str, type: str, value: object):
+        msg = (
+            f"Option {name} has unknown configuration type {type} with value {value!r}"
+        )
+        raise ValueError(msg)  # pragma: no cover
 
     def _getini(self, name: str):
         try:
@@ -1656,6 +1660,18 @@ def _getini(self, name: str):
             return _strtobool(str(value).strip())
         elif type == "string":
             return value
+        elif type == "int":
+            if not isinstance(value, str):
+                raise TypeError(
+                    f"Expected an int string for option {name} of type integer, but got: {value!r}"
+                ) from None
+            return int(value)
+        elif type == "float":
+            if not isinstance(value, str):
+                raise TypeError(
+                    f"Expected a float string for option {name} of type float, but got: {value!r}"
+                ) from None
+            return float(value)
         elif type is None:
             return value
         else:

src/_pytest/config/argparsing.py

@@ -191,6 +191,12 @@ def addini(
                 * ``linelist``: a list of strings, separated by line breaks
                 * ``paths``: a list of :class:`pathlib.Path`, separated as in a shell
                 * ``pathlist``: a list of ``py.path``, separated as in a shell
+                * ``int``: an integer
+                * ``float``: a floating-point number
+
+                .. versionadded:: 8.4
+
+                    The ``float`` and ``int`` types.
 
             For ``paths`` and ``pathlist`` types, they are considered relative to the ini-file.
             In case the execution is happening without an ini-file defined,
@@ -209,7 +215,17 @@ def addini(
         The value of ini-variables can be retrieved via a call to
         :py:func:`config.getini(name) <pytest.Config.getini>`.
         """
-        assert type in (None, "string", "paths", "pathlist", "args", "linelist", "bool")
+        assert type in (
+            None,
+            "string",
+            "paths",
+            "pathlist",
+            "args",
+            "linelist",
+            "bool",
+            "int",
+            "float",
+        )
         if default is NOT_SET:
             default = get_ini_default_for_type(type)
 
@@ -218,7 +234,10 @@ def addini(
 
 
 def get_ini_default_for_type(
-    type: Literal["string", "paths", "pathlist", "args", "linelist", "bool"] | None,
+    type: Literal[
+        "string", "paths", "pathlist", "args", "linelist", "bool", "int", "float"
+    ]
+    | None,
 ) -> Any:
     """
     Used by addini to get the default value for a given ini-option type, when
@@ -230,6 +249,10 @@ def get_ini_default_for_type(
         return []
     elif type == "bool":
         return False
+    elif type == "int":
+        return 0
+    elif type == "float":
+        return 0.0
     else:
         return ""
 

src/_pytest/config/findpaths.py

@@ -5,6 +5,7 @@
 import os
 from pathlib import Path
 import sys
+from typing import TYPE_CHECKING
 
 import iniconfig
 
@@ -15,6 +16,16 @@
 from _pytest.pathlib import safe_exists
 
 
+if TYPE_CHECKING:
+    from typing import Union
+
+    from typing_extensions import TypeAlias
+
+    # Even though TOML supports richer data types, all values are converted to str/list[str] during
+    # parsing to maintain compatibility with the rest of the configuration system.
+    ConfigDict: TypeAlias = dict[str, Union[str, list[str]]]
+
+
 def _parse_ini_config(path: Path) -> iniconfig.IniConfig:
     """Parse the given generic '.ini' file using legacy IniConfig parser, returning
     the parsed object.
@@ -29,7 +40,7 @@ def _parse_ini_config(path: Path) -> iniconfig.IniConfig:
 
 def load_config_dict_from_file(
     filepath: Path,
-) -> dict[str, str | list[str]] | None:
+) -> ConfigDict | None:
     """Load pytest configuration from the given file path, if supported.
 
     Return None if the file does not contain valid pytest configuration.
@@ -85,7 +96,7 @@ def make_scalar(v: object) -> str | list[str]:
 def locate_config(
     invocation_dir: Path,
     args: Iterable[Path],
-) -> tuple[Path | None, Path | None, dict[str, str | list[str]]]:
+) -> tuple[Path | None, Path | None, ConfigDict]:
     """Search in the list of arguments for a valid ini-file for pytest,
     and return a tuple of (rootdir, inifile, cfg-dict)."""
     config_names = [
@@ -172,7 +183,7 @@ def determine_setup(
     args: Sequence[str],
     rootdir_cmd_arg: str | None,
     invocation_dir: Path,
-) -> tuple[Path, Path | None, dict[str, str | list[str]]]:
+) -> tuple[Path, Path | None, ConfigDict]:
     """Determine the rootdir, inifile and ini configuration values from the
     command line arguments.
 

testing/test_config.py

@@ -848,6 +848,82 @@ def pytest_addoption(parser):
         config = pytester.parseconfig()
         assert config.getini("strip") is bool_val
 
+    @pytest.mark.parametrize("str_val, int_val", [("10", 10), ("no-ini", 2)])
+    def test_addini_int(self, pytester: Pytester, str_val: str, int_val: bool) -> None:
+        pytester.makeconftest(
+            """
+            def pytest_addoption(parser):
+                parser.addini("ini_param", "", type="int", default=2)
+        """
+        )
+        if str_val != "no-ini":
+            pytester.makeini(
+                f"""
+                [pytest]
+                ini_param={str_val}
+            """
+            )
+        config = pytester.parseconfig()
+        assert config.getini("ini_param") == int_val
+
+    def test_addini_int_invalid(self, pytester: Pytester) -> None:
+        pytester.makeconftest(
+            """
+            def pytest_addoption(parser):
+                parser.addini("ini_param", "", type="int", default=2)
+        """
+        )
+        pytester.makepyprojecttoml(
+            """
+            [tool.pytest.ini_options]
+            ini_param=["foo"]
+            """
+        )
+        config = pytester.parseconfig()
+        with pytest.raises(
+            TypeError, match="Expected an int string for option ini_param"
+        ):
+            _ = config.getini("ini_param")
+
+    @pytest.mark.parametrize("str_val, float_val", [("10.5", 10.5), ("no-ini", 2.2)])
+    def test_addini_float(
+        self, pytester: Pytester, str_val: str, float_val: bool
+    ) -> None:
+        pytester.makeconftest(
+            """
+            def pytest_addoption(parser):
+                parser.addini("ini_param", "", type="float", default=2.2)
+        """
+        )
+        if str_val != "no-ini":
+            pytester.makeini(
+                f"""
+                [pytest]
+                ini_param={str_val}
+            """
+            )
+        config = pytester.parseconfig()
+        assert config.getini("ini_param") == float_val
+
+    def test_addini_float_invalid(self, pytester: Pytester) -> None:
+        pytester.makeconftest(
+            """
+            def pytest_addoption(parser):
+                parser.addini("ini_param", "", type="float", default=2.2)
+        """
+        )
+        pytester.makepyprojecttoml(
+            """
+            [tool.pytest.ini_options]
+            ini_param=["foo"]
+            """
+        )
+        config = pytester.parseconfig()
+        with pytest.raises(
+            TypeError, match="Expected a float string for option ini_param"
+        ):
+            _ = config.getini("ini_param")
+
     def test_addinivalue_line_existing(self, pytester: Pytester) -> None:
         pytester.makeconftest(
             """