beartype.door API tests x 2.

This commit is the next in a commit chain repairing currently failing
tests pertaining to the `beartype.door` subpackage, recently implemented
by Harvard microscopist and general genius @tlambert03 in PR #136.
Specifically, this commit:

* Renames `beartype.math` to `beartype.door`. N-n-now... hear me out
  here. I came up with a ludicrous acronym and we're going to have to
  learn to live with it: the **D**ecidedly **O**bject-**O**rientedly
  **R**ecursive (DOOR) API. Or, `beartype.door` for short. Open the door
  to a whole new type-hinting world, everyone.
* Refactored `beartype_test.test_is_subtype` to defer unsafe
  instantiation of non-trivial global variables to test-time via
  `pytest` fixtures.
* Shifted `beartype_test.test_is_subtype` to
  `beartype_test.a00_unit.a60_api.door.test_door` for disambiguity and
  testability.

Since `beartype.door` remains critically broken under both Python 3.7
and 3.8, tests remain disabled until the Typing Doctor gets in.
(*Hazardous hazmats are arduous!*)

README.rst

@@ -2522,6 +2522,10 @@ Let's chart current and future compliance with Python's `typing`_ landscape:
 +--------------------+-----------------------------------------+-------------------------------+---------------------------+
 |                    | die_if_unbearable_                      | **0.10.0**\ —\ *current*      | **0.10.0**\ —\ *current*  |
 +--------------------+-----------------------------------------+-------------------------------+---------------------------+
+| beartype.door      | TypeHint                                | **0.11.0**\ —\ *current*      | **0.11.0**\ —\ *current*  |
++--------------------+-----------------------------------------+-------------------------------+---------------------------+
+|                    | is_subhint                              | **0.10.0**\ —\ *current*      | **0.10.0**\ —\ *current*  |
++--------------------+-----------------------------------------+-------------------------------+---------------------------+
 | beartype.typing    | *all*                                   | **0.10.0**\ —\ *current*      | **0.10.0**\ —\ *current*  |
 +--------------------+-----------------------------------------+-------------------------------+---------------------------+
 | beartype.vale_     | Is_                                     | **0.7.0**\ —\ *current*       | **0.7.0**\ —\ *current*   |
@@ -2776,7 +2780,9 @@ Let's chart current and future compliance with Python's `typing`_ landscape:
 +--------------------+-----------------------------------------+-------------------------------+---------------------------+
 | typing_extensions_ | *all attributes*                        | **0.8.0**\ —\ *current*       | **0.8.0**\ —\ *current*   |
 +--------------------+-----------------------------------------+-------------------------------+---------------------------+
-| PEP                | `484 <PEP 484_>`__                      | **0.2.0**\ —\ *current*       | *none*                    |
+| PEP                | `362 <PEP 362_>`__                      | *none*                        | *none*                    |
++--------------------+-----------------------------------------+-------------------------------+---------------------------+
+|                    | `484 <PEP 484_>`__                      | **0.2.0**\ —\ *current*       | *none*                    |
 +--------------------+-----------------------------------------+-------------------------------+---------------------------+
 |                    | `544 <PEP 544_>`__                      | **0.4.0**\ —\ *current*       | **0.4.0**\ —\ *current*   |
 +--------------------+-----------------------------------------+-------------------------------+---------------------------+
@@ -5026,6 +5032,8 @@ rather than Python runtime) include:
    https://www.python.org/dev/peps
 .. _PEP 20:
    https://www.python.org/dev/peps/pep-0020
+.. _PEP 362:
+   https://www.python.org/dev/peps/pep-0362
 .. _PEP 483:
    https://www.python.org/dev/peps/pep-0483
 .. _PEP 526:

beartype/abby/__init__.py

@@ -25,7 +25,6 @@
 # names (e.g., "from argparse import ArgumentParser as _ArgumentParser" rather
 # than merely "from argparse import ArgumentParser").
 #!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-# ....................{ IMPORTS                            }....................
 from beartype.abby._abbytest import (
     die_if_unbearable as die_if_unbearable,
     is_bearable as is_bearable,

beartype/door/__init__.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+# --------------------( LICENSE                            )--------------------
+# Copyright (c) 2014-2022 Beartype authors.
+# See "LICENSE" for further details.
+
+'''
+**Beartype Decidedly Object-Orientedly Recursive (DOOR) API.**
+
+This subpackage provides an object-oriented type hint class hierarchy,
+encapsulating the crude non-object-oriented type hint declarative API
+standardized by the :mod:`typing` module.
+'''
+
+# ....................{ TODO                               }....................
+#FIXME: Publicly document everything in "README.rst", please. *sigh*
+
+# ....................{ IMPORTS                            }....................
+#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+# WARNING: To avoid polluting the public module namespace, external attributes
+# should be locally imported at module scope *ONLY* under alternate private
+# names (e.g., "from argparse import ArgumentParser as _ArgumentParser" rather
+# than merely "from argparse import ArgumentParser").
+#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+from beartype.door._doorcls import (
+    TypeHint as TypeHint,
+    is_subhint as is_subhint,
+)