diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/core/__init__.py b/tests/core/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/core/test_config.py b/tests/core/test_config.py
new file mode 100644
index 00000000..57bcea73
--- /dev/null
+++ b/tests/core/test_config.py
@@ -0,0 +1,226 @@
+
+import asyncio
+import itertools
+
+import pytest
+
+from core.config import Config
+
+
+
+_counter = itertools.count()
+
+
+def make_conf(force_registration=False):
+    name = "TestCog{}".format(next(_counter))
+    return Config.get_conf(name, unique_identifier=next(_counter),
+                           force_registration=force_registration)
+
+
+def run(coro):
+
+    loop = asyncio.new_event_loop()
+    try:
+        return loop.run_until_complete(coro)
+    finally:
+        loop.close()
+
+
+class FakeIdObject:
+    def __init__(self, id):
+        self.id = id
+
+
+
+
+def test_global_default_returned_when_unset():
+    conf = make_conf()
+    conf.register_global(foo=42, bar="baz")
+    assert conf.foo() == 42
+    assert conf.bar() == "baz"
+
+
+def test_global_set_then_read():
+    conf = make_conf()
+    conf.register_global(foo=42)
+    run(conf.set("foo", 100))
+    assert conf.foo() == 100
+
+
+def test_unregistered_read_returns_none_without_strict():
+    conf = make_conf()
+    assert conf.nonexistent() is None
+
+
+def test_set_unregistered_allowed_without_strict():
+    conf = make_conf()
+    run(conf.set("dynamic", 7))
+    assert conf.dynamic() == 7
+
+
+
+
+def test_guild_default_and_set():
+    conf = make_conf()
+    conf.register_guild(prefix="!")
+    assert conf.guild(1).prefix() == "!"
+    run(conf.guild(1).set("prefix", "?"))
+    assert conf.guild(1).prefix() == "?"
+
+
+def test_guild_isolation_between_ids():
+    conf = make_conf()
+    conf.register_guild(prefix="!")
+    run(conf.guild(1).set("prefix", "?"))
+    assert conf.guild(1).prefix() == "?"
+    assert conf.guild(2).prefix() == "!"
+
+
+def test_guild_does_not_leak_into_global():
+    conf = make_conf()
+    conf.register_global(value=0)
+    conf.register_guild(value=0)
+    run(conf.guild(1).set("value", 99))
+    assert conf.value() == 0
+    assert conf.guild(2).value() == 0
+
+
+def test_scopes_have_independent_keysets():
+    conf = make_conf()
+    conf.register_global(only_global=1)
+    conf.register_guild(only_guild=2)
+    assert conf.only_global() == 1
+    assert conf.guild(1).only_global() is None
+    assert conf.guild(1).only_guild() == 2
+    assert conf.only_guild() is None
+
+
+
+
+def test_channel_role_user_scopes():
+    conf = make_conf()
+    conf.register_channel(a=1)
+    conf.register_role(b=2)
+    conf.register_user(c=3)
+
+    assert conf.channel(10).a() == 1
+    assert conf.role(10).b() == 2
+    assert conf.user(10).c() == 3
+
+    run(conf.channel(10).set("a", 11))
+    run(conf.role(10).set("b", 22))
+    run(conf.user(10).set("c", 33))
+
+    assert conf.channel(10).a() == 11
+    assert conf.channel(99).a() == 1
+    assert conf.role(10).b() == 22
+    assert conf.role(99).b() == 2
+    assert conf.user(10).c() == 33
+    assert conf.user(99).c() == 3
+
+
+
+
+def test_member_default_and_set():
+    conf = make_conf()
+    conf.register_member(points=0)
+    assert conf.member(1, 5).points() == 0
+    run(conf.member(1, 5).set("points", 50))
+    assert conf.member(1, 5).points() == 50
+
+
+def test_member_composite_isolation():
+    conf = make_conf()
+    conf.register_member(points=0)
+    run(conf.member(1, 5).set("points", 50))
+
+    assert conf.member(2, 5).points() == 0
+
+    assert conf.member(1, 6).points() == 0
+    assert conf.member(1, 5).points() == 50
+
+
+
+
+def test_id_object_equivalent_to_int():
+    conf = make_conf()
+    conf.register_guild(prefix="!")
+    run(conf.guild(123).set("prefix", "$"))
+    assert conf.guild(FakeIdObject(123)).prefix() == "$"
+    run(conf.guild(FakeIdObject(123)).set("prefix", "%"))
+    assert conf.guild(123).prefix() == "%"
+
+
+def test_member_id_objects():
+    conf = make_conf()
+    conf.register_member(points=0)
+    run(conf.member(FakeIdObject(1), FakeIdObject(5)).set("points", 7))
+    assert conf.member(1, 5).points() == 7
+
+
+
+
+def test_clear_resets_scope_to_defaults():
+    conf = make_conf()
+    conf.register_guild(prefix="!")
+    run(conf.guild(1).set("prefix", "?"))
+    assert conf.guild(1).prefix() == "?"
+    run(conf.guild(1).clear())
+    assert conf.guild(1).prefix() == "!"
+
+
+def test_clear_only_affects_target_scope():
+    conf = make_conf()
+    conf.register_guild(prefix="!")
+    run(conf.guild(1).set("prefix", "?"))
+    run(conf.guild(2).set("prefix", "."))
+    run(conf.guild(1).clear())
+    assert conf.guild(1).prefix() == "!"
+    assert conf.guild(2).prefix() == "."
+
+
+
+
+def test_register_merges_and_overrides():
+    conf = make_conf()
+    conf.register_global(a=1, b=2)
+    conf.register_global(b=20, c=3)
+    assert conf.a() == 1
+    assert conf.b() == 20
+    assert conf.c() == 3
+
+
+
+
+def test_strict_read_unregistered_raises():
+    conf = make_conf(force_registration=True)
+    conf.register_global(known=1)
+    with pytest.raises(AttributeError):
+        conf.unknown()
+
+
+def test_strict_set_unregistered_raises():
+    conf = make_conf(force_registration=True)
+    conf.register_global(known=1)
+    with pytest.raises(AttributeError):
+        run(conf.set("unknown", 5))
+
+
+def test_strict_registered_key_works():
+    conf = make_conf(force_registration=True)
+    conf.register_global(known=1)
+    conf.register_guild(gkey=2)
+    assert conf.known() == 1
+    run(conf.set("known", 9))
+    assert conf.known() == 9
+    assert conf.guild(1).gkey() == 2
+    run(conf.guild(1).set("gkey", 8))
+    assert conf.guild(1).gkey() == 8
+
+
+def test_strict_is_per_scope():
+    conf = make_conf(force_registration=True)
+    conf.register_global(known=1)
+
+    with pytest.raises(AttributeError):
+        conf.guild(1).known()
diff --git a/mimo_test_command.sh b/mimo_test_command.sh
new file mode 100755
--- /dev/null
+++ b/mimo_test_command.sh
@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+
+
+
+set -euo pipefail
+HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd /testbed
+
+
+
+
+
+
+
+
+
+SP="$PWD/.venv/lib/python3.12/site-packages"
+if [ ! -f "$SP/pytest/__init__.pyc" ]; then
+    find "$SP" -type d -name __pycache__ | while read -r d; do
+        parent="$(dirname "$d")"
+        for f in "$d"/*.cpython-312.pyc; do
+            [ -e "$f" ] || continue
+            base="$(basename "$f" .cpython-312.pyc)"
+            [ -e "$parent/$base.pyc" ] || cp "$f" "$parent/$base.pyc"
+        done
+    done
+fi
+export PYTHONPATH="$SP"
+
+
+
+
+python3 -c "import core, core.json_io, core.utils.chat_formatting"
+
+
+python3 -m pytest tests/core/test_config.py -q