Add a module script to run h5py tests with a patched dataset class.

Since additional dependencies are required by h5py tests, a package extra has
been added to require them.

README.rst

@@ -43,3 +43,5 @@ Running tests
 If you have installed ``b2h5py``, just run ``python -m unittest discover b2h5py.tests``.
 
 Otherwise, just enter its source code directory and run ``python -m unittest``.
+
+You can also run the h5py tests with the patched ``Dataset`` class to check that patching does not break anything. You may install the ``h5py-test`` extra (e.g. ``pip install b2h5py[h5py-test]`` and run ``python -m b2h5py.tests.test_patched_h5py``.

b2h5py/tests/test_patched_h5py.py

@@ -0,0 +1,28 @@
+"""Run h5py unit tests with patched dataset class.
+
+This module does not provide test cases, but it calls the h5py tests directly.
+You may run it with ``python -m b2h5py.tests.test_patched_h5py``.
+
+This module has additional dependencies.  You may want to install this
+package's ``h5py-test`` extra.
+"""
+
+import os
+import unittest
+
+import b2h5py
+import h5py
+import h5py.tests
+
+
+def run_h5py_tests():
+    """Run h5py unit tests with patched dataset class"""
+    test_suite = unittest.defaultTestLoader.discover(
+        os.path.dirname(h5py.tests.__file__),
+        top_level_dir=os.path.dirname(os.path.dirname(h5py.__file__)))
+    test_runner = unittest.TextTestRunner()
+    test_runner.run(test_suite)
+
+
+if __name__ == '__main__':
+    run_h5py_tests()

pyproject.toml

@@ -32,3 +32,9 @@ dependencies = [
 [project.urls]
 Homepage = "https://github.com/Blosc/b2h5py"
 Issues = "https://github.com/Blosc/b2h5py/issues"
+
+[project.optional-dependencies]
+h5py-test = [
+    # "h5py[test]",  # no such extra in h5py
+    "pytest",  # to run h5py tests
+]