[PR #13338/0c454979 backport][8.3.x] Fix broken approx when mixing numpy booleans and booleans

AUTHORS

@@ -54,6 +54,7 @@ Ashish Kurmi
 Aviral Verma
 Aviv Palivoda
 Babak Keyvani
+Bahram Farahmand
 Barney Gale
 Ben Brown
 Ben Gartner

changelog/13047.bugfix.rst

@@ -0,0 +1,17 @@
+Restore :func:`pytest.approx` handling of equality checks between `bool` and `numpy.bool_` types.
+
+Comparing `bool` and `numpy.bool_` using :func:`pytest.approx` accidentally changed in version `8.3.4` and `8.3.5` to no longer match:
+
+.. code-block:: pycon
+
+    >>> import numpy as np
+    >>> from pytest import approx
+    >>> [np.True_, np.True_] == pytest.approx([True, True])
+    False
+
+This has now been fixed:
+
+.. code-block:: pycon
+
+    >>> [np.True_, np.True_] == pytest.approx([True, True])
+    True

src/_pytest/python_api.py

@@ -426,23 +426,35 @@ def __repr__(self) -> str:
     def __eq__(self, actual) -> bool:
         """Return whether the given value is equal to the expected value
         within the pre-specified tolerance."""
+
+        def is_bool(val: Any) -> bool:
+            # Check if `val` is a native bool or numpy bool.
+            if isinstance(val, bool):
+                return True
+            try:
+                import numpy as np
+
+                return isinstance(val, np.bool_)
+            except ImportError:
+                return False
+
         asarray = _as_numpy_array(actual)
         if asarray is not None:
             # Call ``__eq__()`` manually to prevent infinite-recursion with
             # numpy<1.13.  See #3748.
             return all(self.__eq__(a) for a in asarray.flat)
 
-        # Short-circuit exact equality, except for bool
-        if isinstance(self.expected, bool) and not isinstance(actual, bool):
+        # Short-circuit exact equality, except for bool and np.bool_
+        if is_bool(self.expected) and not is_bool(actual):
             return False
         elif actual == self.expected:
             return True
 
         # If either type is non-numeric, fall back to strict equality.
         # NB: we need Complex, rather than just Number, to ensure that __abs__,
         # __sub__, and __float__ are defined. Also, consider bool to be
-        # nonnumeric, even though it has the required arithmetic.
-        if isinstance(self.expected, bool) or not (
+        # non-numeric, even though it has the required arithmetic.
+        if is_bool(self.expected) or not (
             isinstance(self.expected, (Complex, Decimal))
             and isinstance(actual, (Complex, Decimal))
         ):

testing/python/approx.py

@@ -610,6 +610,15 @@ def test_expecting_bool(self) -> None:
         assert True != approx(False, abs=2)  # noqa: E712
         assert 1 != approx(True)
 
+    def test_expecting_bool_numpy(self) -> None:
+        """Check approx comparing with numpy.bool (#13047)."""
+        np = pytest.importorskip("numpy")
+        assert np.False_ != approx(True)
+        assert np.True_ != approx(False)
+        assert np.True_ == approx(True)
+        assert np.False_ == approx(False)
+        assert np.True_ != approx(False, abs=2)
+
     def test_list(self):
         actual = [1 + 1e-7, 2 + 1e-8]
         expected = [1, 2]