Add docs for testing module

CHANGES

@@ -14,7 +14,7 @@ Pint Changelog
 
 
 0.24.1 (2024-06-24)
------------------
+-------------------
 
 - Fix custom formatter needing the registry object. (PR #2011)
 - Support python 3.9 following difficulties installing with NumPy 2. (PR #2019)

docs/conf.py

@@ -45,6 +45,7 @@
     "sphinx_design",
 ]
 
+
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ["_templates"]
 

docs/ecosystem.rst

@@ -13,7 +13,7 @@ Pint integrations:
 
 
 Packages using pint:
-------------------
+--------------------
 
 - `fluids <https://github.com/CalebBell/fluids>`_ Practical fluid dynamics calculations
 - `ht <https://github.com/CalebBell/ht/>`_ Practical heat transfer calculations

pint/testing.py

@@ -1,3 +1,13 @@
+"""
+	pint.testing
+	~~~~~~~~~~~~
+
+	Functions for testing whether pint quantities are equal.
+
+	:copyright: 2016 by Pint Authors, see AUTHORS for more details..
+	:license: BSD, see LICENSE for more details.
+"""
+
 from __future__ import annotations
 
 import math
@@ -35,6 +45,25 @@ def _get_comparable_magnitudes(first, second, msg):
 
 
 def assert_equal(first, second, msg: str | None = None) -> None:
+    """
+    Assert that two quantities are equal
+
+    Parameters
+    ----------
+    first
+        First quantity to compare
+
+    second
+        Second quantity to compare
+
+    msg
+        If supplied, message to show if the two quantities aren't equal.
+
+    Raises
+    ------
+    AssertionError
+        The two quantities are not equal.
+    """
     if msg is None:
         msg = f"Comparing {first!r} and {second!r}. "
 
@@ -60,6 +89,33 @@ def assert_equal(first, second, msg: str | None = None) -> None:
 def assert_allclose(
     first, second, rtol: float = 1e-07, atol: float = 0, msg: str | None = None
 ) -> None:
+    """
+    Assert that two quantities are all close
+
+    Unlike numpy, this uses a symmetric check of closeness.
+
+    Parameters
+    ----------
+    first
+        First quantity to compare
+
+    second
+        Second quantity to compare
+
+    rtol
+        Relative tolerance to use when checking for closeness.
+
+    atol
+        Absolute tolerance to use when checking for closeness.
+
+    msg
+        If supplied, message to show if the two quantities aren't equal.
+
+    Raises
+    ------
+    AssertionError
+        The two quantities are not close to within the supplied tolerance.
+    """
     if msg is None:
         try:
             msg = f"Comparing {first!r} and {second!r}. "