Deprecated define_* and DEFINE_* methods on jax.config

These methods are internal to JAX. Yet, prior to this commit they were
effectively part of the public API, since users could (and some did!) invoke
them on `jax.config`.

tests/BUILD

@@ -63,6 +63,14 @@ jax_test(
     },
 )
 
+py_test(
+    name = "config_test",
+    srcs = ["config_test.py"],
+    deps = [
+        "//jax",
+    ],
+)
+
 jax_test(
     name = "core_test",
     srcs = ["core_test.py"],

tests/config_test.py

@@ -0,0 +1,36 @@
+# Copyright 2023 The JAX Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import unittest
+
+from jax import config
+
+class ConfigTest(unittest.TestCase):
+  def test_deprecations(self):
+    for name in ["DEFINE_bool", "define_bool_state"]:
+      with (
+          self.subTest(name),
+          self.assertWarnsRegex(
+              DeprecationWarning,
+              "other libraries for configuration"),
+      ):
+        getattr(config, name)
+
+  def test_missing_attribute(self):
+    with self.assertRaises(AttributeError):
+      config.missing_attribute
+
+
+if __name__ == '__main__':
+  unittest.main()