Add failing test for testing out-of-order kw-only args

Author: honno

Diff for: array_api_tests/meta/test_signatures.py

@@ -0,0 +1,20 @@
+from inspect import signature
+
+import pytest
+
+from ..test_signatures import _test_inspectable_func
+
+
+@pytest.mark.xfail("not implemented")
+def test_kwonly():
+    def func(*, foo=None, bar=None):
+        pass
+
+    sig = signature(func)
+    _test_inspectable_func(sig, sig)
+
+    def reversed_func(*, bar=None, foo=None):
+        pass
+
+    reversed_sig = signature(reversed_func)
+    _test_inspectable_func(sig, reversed_sig)