diff --git a/.gitignore b/.gitignore
index ec1dc75..9886afe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -136,4 +136,4 @@ dmypy.json
 .pytype/
 
 # test
-./test.py
\ No newline at end of file
+./test.py
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index b211cb6..05fdeca 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -3,4 +3,16 @@ repos:
     rev: 22.3.0 # Replace by any tag/version: https://github.com/psf/black/tags
     hooks:
       - id: black
-        language_version: python3 # Should be a command that runs python3.6+
\ No newline at end of file
+        language_version: python3
+
+  - repo: https://github.com/pycqa/isort
+    rev: 5.10.1
+    hooks:
+      - id: isort
+        name: isort (python)
+
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.1.0
+    hooks:
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 8643007..eb8de77 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -11,4 +11,4 @@
         "Unexisted",
         "utilles"
     ]
-}
\ No newline at end of file
+}
diff --git a/README.md b/README.md
index 75fba02..cabdd8f 100644
--- a/README.md
+++ b/README.md
@@ -40,4 +40,4 @@ loop.run_until_complete(main())
 ```
 
 ## 开源协议
-本实现以 MIT 为开源协议。
\ No newline at end of file
+本实现以 MIT 为开源协议。
diff --git a/poetry.lock b/poetry.lock
index 91d7946..7b7c7be 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,10 +1,29 @@
 [[package]]
-name = "appdirs"
-version = "1.4.4"
-description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+name = "atomicwrites"
+version = "1.4.0"
+description = "Atomic file writes."
 category = "dev"
 optional = false
-python-versions = "*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[package.source]
+type = "legacy"
+url = "https://pypi.tuna.tsinghua.edu.cn/simple"
+reference = "tunapypi"
+
+[[package]]
+name = "attrs"
+version = "21.4.0"
+description = "Classes Without Boilerplate"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[package.extras]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit", "cloudpickle"]
+docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "cloudpickle"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "cloudpickle"]
 
 [package.source]
 type = "legacy"
@@ -13,25 +32,26 @@ reference = "tunapypi"
 
 [[package]]
 name = "black"
-version = "20.8b1"
+version = "22.1.0"
 description = "The uncompromising code formatter."
 category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.6.2"
 
 [package.dependencies]
-appdirs = "*"
-click = ">=7.1.2"
-mypy_extensions = ">=0.4.3"
-pathspec = ">=0.6,<1"
-regex = ">=2020.1.8"
-toml = ">=0.10.1"
-typed-ast = ">=1.4.0"
-typing_extensions = ">=3.7.4"
+click = ">=8.0.0"
+mypy-extensions = ">=0.4.3"
+pathspec = ">=0.9.0"
+platformdirs = ">=2"
+tomli = ">=1.1.0"
+typed-ast = {version = ">=1.4.2", markers = "python_version < \"3.8\" and implementation_name == \"cpython\""}
+typing-extensions = {version = ">=3.10.0.0", markers = "python_version < \"3.10\""}
 
 [package.extras]
 colorama = ["colorama (>=0.4.3)"]
-d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]
+d = ["aiohttp (>=3.7.4)"]
+jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
+uvloop = ["uvloop (>=0.15.2)"]
 
 [package.source]
 type = "legacy"
@@ -81,6 +101,22 @@ type = "legacy"
 url = "https://pypi.tuna.tsinghua.edu.cn/simple"
 reference = "tunapypi"
 
+[[package]]
+name = "coverage"
+version = "6.3.2"
+description = "Code coverage measurement for Python"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+toml = ["tomli"]
+
+[package.source]
+type = "legacy"
+url = "https://pypi.tuna.tsinghua.edu.cn/simple"
+reference = "tunapypi"
+
 [[package]]
 name = "distlib"
 version = "0.3.4"
@@ -113,17 +149,17 @@ reference = "tunapypi"
 
 [[package]]
 name = "flake8"
-version = "3.9.2"
+version = "4.0.1"
 description = "the modular source code checker: pep8 pyflakes and co"
 category = "dev"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+python-versions = ">=3.6"
 
 [package.dependencies]
-importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
+importlib-metadata = {version = "<4.3", markers = "python_version < \"3.8\""}
 mccabe = ">=0.6.0,<0.7.0"
-pycodestyle = ">=2.7.0,<2.8.0"
-pyflakes = ">=2.3.0,<2.4.0"
+pycodestyle = ">=2.8.0,<2.9.0"
+pyflakes = ">=2.4.0,<2.5.0"
 
 [package.source]
 type = "legacy"
@@ -148,11 +184,11 @@ reference = "tunapypi"
 
 [[package]]
 name = "importlib-metadata"
-version = "4.10.1"
+version = "4.2.0"
 description = "Read metadata from Python packages"
 category = "dev"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.6"
 
 [package.dependencies]
 typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
@@ -160,8 +196,20 @@ zipp = ">=0.5"
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-perf = ["ipython"]
-testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pyfakefs", "flufl.flake8", "pytest-perf (>=0.9.2)", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
+testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
+
+[package.source]
+type = "legacy"
+url = "https://pypi.tuna.tsinghua.edu.cn/simple"
+reference = "tunapypi"
+
+[[package]]
+name = "iniconfig"
+version = "1.1.1"
+description = "iniconfig: brain-dead simple config-ini parsing"
+category = "dev"
+optional = false
+python-versions = "*"
 
 [package.source]
 type = "legacy"
@@ -226,6 +274,22 @@ type = "legacy"
 url = "https://pypi.tuna.tsinghua.edu.cn/simple"
 reference = "tunapypi"
 
+[[package]]
+name = "packaging"
+version = "21.3"
+description = "Core utilities for Python packages"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+pyparsing = ">=2.0.2,<3.0.5 || >3.0.5"
+
+[package.source]
+type = "legacy"
+url = "https://pypi.tuna.tsinghua.edu.cn/simple"
+reference = "tunapypi"
+
 [[package]]
 name = "pathspec"
 version = "0.9.0"
@@ -256,6 +320,26 @@ type = "legacy"
 url = "https://pypi.tuna.tsinghua.edu.cn/simple"
 reference = "tunapypi"
 
+[[package]]
+name = "pluggy"
+version = "1.0.0"
+description = "plugin and hook calling mechanisms for python"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
+
+[package.source]
+type = "legacy"
+url = "https://pypi.tuna.tsinghua.edu.cn/simple"
+reference = "tunapypi"
+
 [[package]]
 name = "pre-commit"
 version = "2.17.0"
@@ -278,13 +362,26 @@ type = "legacy"
 url = "https://pypi.tuna.tsinghua.edu.cn/simple"
 reference = "tunapypi"
 
+[[package]]
+name = "py"
+version = "1.11.0"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[package.source]
+type = "legacy"
+url = "https://pypi.tuna.tsinghua.edu.cn/simple"
+reference = "tunapypi"
+
 [[package]]
 name = "pycodestyle"
-version = "2.7.0"
+version = "2.8.0"
 description = "Python style guide checker"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.source]
 type = "legacy"
@@ -293,7 +390,7 @@ reference = "tunapypi"
 
 [[package]]
 name = "pyflakes"
-version = "2.3.1"
+version = "2.4.0"
 description = "passive checker of Python programs"
 category = "dev"
 optional = false
@@ -321,25 +418,75 @@ url = "https://pypi.tuna.tsinghua.edu.cn/simple"
 reference = "tunapypi"
 
 [[package]]
-name = "pyyaml"
-version = "6.0"
-description = "YAML parser and emitter for Python"
+name = "pyparsing"
+version = "3.0.7"
+description = "Python parsing module"
 category = "dev"
 optional = false
 python-versions = ">=3.6"
 
+[package.extras]
+diagrams = ["jinja2", "railroad-diagrams"]
+
 [package.source]
 type = "legacy"
 url = "https://pypi.tuna.tsinghua.edu.cn/simple"
 reference = "tunapypi"
 
 [[package]]
-name = "regex"
-version = "2022.1.18"
-description = "Alternative regular expression module, to replace re."
+name = "pytest"
+version = "7.0.1"
+description = "pytest: simple powerful testing with Python"
 category = "dev"
 optional = false
-python-versions = "*"
+python-versions = ">=3.6"
+
+[package.dependencies]
+atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
+attrs = ">=19.2.0"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+iniconfig = "*"
+packaging = "*"
+pluggy = ">=0.12,<2.0"
+py = ">=1.8.2"
+tomli = ">=1.0.0"
+
+[package.extras]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "xmlschema"]
+
+[package.source]
+type = "legacy"
+url = "https://pypi.tuna.tsinghua.edu.cn/simple"
+reference = "tunapypi"
+
+[[package]]
+name = "pytest-asyncio"
+version = "0.18.2"
+description = "Pytest support for asyncio"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+pytest = ">=6.1.0"
+typing-extensions = {version = ">=3.7.2", markers = "python_version < \"3.8\""}
+
+[package.extras]
+testing = ["coverage (==6.2)", "hypothesis (>=5.7.1)", "flaky (>=3.5.0)", "mypy (==0.931)"]
+
+[package.source]
+type = "legacy"
+url = "https://pypi.tuna.tsinghua.edu.cn/simple"
+reference = "tunapypi"
+
+[[package]]
+name = "pyyaml"
+version = "6.0"
+description = "YAML parser and emitter for Python"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
 
 [package.source]
 type = "legacy"
@@ -372,6 +519,19 @@ type = "legacy"
 url = "https://pypi.tuna.tsinghua.edu.cn/simple"
 reference = "tunapypi"
 
+[[package]]
+name = "tomli"
+version = "2.0.1"
+description = "A lil' TOML parser"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.source]
+type = "legacy"
+url = "https://pypi.tuna.tsinghua.edu.cn/simple"
+reference = "tunapypi"
+
 [[package]]
 name = "typed-ast"
 version = "1.5.2"
@@ -458,15 +618,41 @@ reference = "tunapypi"
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "7167ae5e724c0fb6e17660c1f2d2871d780a9698fd83891cc96d130ad3f8f46b"
+content-hash = "f7606ccc0396c782606c388b2740738059fecead2ba1c46dc841afb3b6758ea6"
 
 [metadata.files]
-appdirs = [
-    {file = "appdirs-1.4.4-py2.py3-none-any.whl", hash = "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"},
-    {file = "appdirs-1.4.4.tar.gz", hash = "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41"},
+atomicwrites = [
+    {file = "atomicwrites-1.4.0-py2.py3-none-any.whl", hash = "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197"},
+    {file = "atomicwrites-1.4.0.tar.gz", hash = "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"},
+]
+attrs = [
+    {file = "attrs-21.4.0-py2.py3-none-any.whl", hash = "sha256:2d27e3784d7a565d36ab851fe94887c5eccd6a463168875832a1be79c82828b4"},
+    {file = "attrs-21.4.0.tar.gz", hash = "sha256:626ba8234211db98e869df76230a137c4c40a12d72445c45d5f5b716f076e2fd"},
 ]
 black = [
-    {file = "black-20.8b1.tar.gz", hash = "sha256:1c02557aa099101b9d21496f8a914e9ed2222ef70336404eeeac8edba836fbea"},
+    {file = "black-22.1.0-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:1297c63b9e1b96a3d0da2d85d11cd9bf8664251fd69ddac068b98dc4f34f73b6"},
+    {file = "black-22.1.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:2ff96450d3ad9ea499fc4c60e425a1439c2120cbbc1ab959ff20f7c76ec7e866"},
+    {file = "black-22.1.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:0e21e1f1efa65a50e3960edd068b6ae6d64ad6235bd8bfea116a03b21836af71"},
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+    {file = "black-22.1.0-cp36-cp36m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:35944b7100af4a985abfcaa860b06af15590deb1f392f06c8683b4381e8eeaf0"},
+    {file = "black-22.1.0-cp36-cp36m-win_amd64.whl", hash = "sha256:7835fee5238fc0a0baf6c9268fb816b5f5cd9b8793423a75e8cd663c48d073ba"},
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+    {file = "black-22.1.0-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:5fa1db02410b1924b6749c245ab38d30621564e658297484952f3d8a39fce7e8"},
+    {file = "black-22.1.0-cp37-cp37m-win_amd64.whl", hash = "sha256:c8226f50b8c34a14608b848dc23a46e5d08397d009446353dad45e04af0c8e28"},
+    {file = "black-22.1.0-cp38-cp38-macosx_10_9_universal2.whl", hash = "sha256:2d6f331c02f0f40aa51a22e479c8209d37fcd520c77721c034517d44eecf5912"},
+    {file = "black-22.1.0-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:742ce9af3086e5bd07e58c8feb09dbb2b047b7f566eb5f5bc63fd455814979f3"},
+    {file = "black-22.1.0-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:fdb8754b453fb15fad3f72cd9cad3e16776f0964d67cf30ebcbf10327a3777a3"},
+    {file = "black-22.1.0-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:f5660feab44c2e3cb24b2419b998846cbb01c23c7fe645fee45087efa3da2d61"},
+    {file = "black-22.1.0-cp38-cp38-win_amd64.whl", hash = "sha256:6f2f01381f91c1efb1451998bd65a129b3ed6f64f79663a55fe0e9b74a5f81fd"},
+    {file = "black-22.1.0-cp39-cp39-macosx_10_9_universal2.whl", hash = "sha256:efbadd9b52c060a8fc3b9658744091cb33c31f830b3f074422ed27bad2b18e8f"},
+    {file = "black-22.1.0-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:8871fcb4b447206904932b54b567923e5be802b9b19b744fdff092bd2f3118d0"},
+    {file = "black-22.1.0-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:ccad888050f5393f0d6029deea2a33e5ae371fd182a697313bdbd835d3edaf9c"},
+    {file = "black-22.1.0-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:07e5c049442d7ca1a2fc273c79d1aecbbf1bc858f62e8184abe1ad175c4f7cc2"},
+    {file = "black-22.1.0-cp39-cp39-win_amd64.whl", hash = "sha256:373922fc66676133ddc3e754e4509196a8c392fec3f5ca4486673e685a421321"},
+    {file = "black-22.1.0-py3-none-any.whl", hash = "sha256:3524739d76b6b3ed1132422bf9d82123cd1705086723bc3e235ca39fd21c667d"},
+    {file = "black-22.1.0.tar.gz", hash = "sha256:a7c0192d35635f6fc1174be575cb7915e92e5dd629ee79fdaf0dcfa41a80afb5"},
 ]
 cfgv = [
     {file = "cfgv-3.3.1-py2.py3-none-any.whl", hash = "sha256:c6a0883f3917a037485059700b9e75da2464e6c27051014ad85ba6aaa5884426"},
@@ -480,6 +666,49 @@ colorama = [
     {file = "colorama-0.4.4-py2.py3-none-any.whl", hash = "sha256:9f47eda37229f68eee03b24b9748937c7dc3868f906e8ba69fbcbdd3bc5dc3e2"},
     {file = "colorama-0.4.4.tar.gz", hash = "sha256:5941b2b48a20143d2267e95b1c2a7603ce057ee39fd88e7329b0c292aa16869b"},
 ]
+coverage = [
+    {file = "coverage-6.3.2-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:9b27d894748475fa858f9597c0ee1d4829f44683f3813633aaf94b19cb5453cf"},
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-    {file = "regex-2022.1.18.tar.gz", hash = "sha256:97f32dc03a8054a4c4a5ab5d761ed4861e828b2c200febd4e46857069a483916"},
-]
 six = [
     {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
     {file = "six-1.16.0.tar.gz", hash = "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926"},
@@ -685,6 +866,10 @@ toml = [
     {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
     {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
 ]
+tomli = [
+    {file = "tomli-2.0.1-py3-none-any.whl", hash = "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc"},
+    {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
+]
 typed-ast = [
     {file = "typed_ast-1.5.2-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:183b183b7771a508395d2cbffd6db67d6ad52958a5fdc99f450d954003900266"},
     {file = "typed_ast-1.5.2-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:676d051b1da67a852c0447621fdd11c4e104827417bf216092ec3e286f7da596"},
diff --git a/pyproject.toml b/pyproject.toml
index 13fba46..d7f1c42 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,22 +10,53 @@ packages = [{ include = "graia", from = "src" }]
 python = "^3.7"
 typing-extensions = { version = "^3.10.0", python = "~3.7" }
 
-[tool.black]
-line-length = 120
-
 [tool.poetry.dev-dependencies]
-black = "^20.8b1"
+black = "^22.1.0"
 pre-commit = "*"
-flake8 = "^3.9.2"
-isort = "^5.9.3"
+flake8 = "^4.0.1"
+isort = "^5.10.1"
 yappi = "^1.3.2"
 pyinstrument = "^4.0.4"
+pytest = "^7.0.1"
+coverage = "^6.3.2"
+pytest-asyncio = "^0.18.2"
 
 [build-system]
 requires = ["poetry>=0.12"]
 build-backend = "poetry.masonry.api"
 
+[tool.black]
+line-length = 120
+
+[tool.isort]
+profile = "black"
+
 [[tool.poetry.source]]
 name = "tunapypi"
 default = true
-url = "https://pypi.tuna.tsinghua.edu.cn/simple/"
\ No newline at end of file
+url = "https://pypi.tuna.tsinghua.edu.cn/simple/"
+
+[tool.coverage.run]
+branch = true
+omit = ["*/test/*"]
+
+[tool.coverage.report]
+# Regexes for lines to exclude from consideration
+exclude_lines = [
+    # standard pragma
+    "pragma: no cover",
+    # Don't complain if non-runnable code isn't run:
+    "if 0:",
+    "if __name__ == .__main__.:",
+    "if (typing\\.)?TYPE_CHECKING( is True)?:",
+    "\\.\\.\\.",
+    "pass",
+    # Don't complain about abstract methods, they aren't run:
+    "@(abc\\.)?abstractmethod",
+    # Don't complain overload method / functions
+    "@(typing\\.)?overload",
+    # don't complain __repr__ and __str__ and __repr_args__ for representation
+    "def __repr__",
+    "def __str__",
+    "def __repr_args__",
+]
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 0000000..4a119db
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,3 @@
+[pytest]
+python_files = src/test/*.py
+asyncio_mode = strict
diff --git a/src/graia/broadcast/__init__.py b/src/graia/broadcast/__init__.py
index bb58579..6dc27b2 100644
--- a/src/graia/broadcast/__init__.py
+++ b/src/graia/broadcast/__init__.py
@@ -1,8 +1,6 @@
 import asyncio
-import copy
 import sys
 import traceback
-from collections import UserList
 from typing import Callable, Dict, Iterable, List, Optional, Type, Union
 
 from graia.broadcast.entities.dispatcher import BaseDispatcher
@@ -37,20 +35,6 @@
 )
 
 
-class DebugList(UserList):
-    def extend(self, item) -> None:
-        print(item)
-        return super().extend(item)
-
-    def append(self, item) -> None:
-        print(item)
-        return super().append(item)
-
-    def insert(self, i: int, item) -> None:
-        print(i, item)
-        return super().insert(i, item)
-
-
 class Broadcast:
     loop: asyncio.AbstractEventLoop
 
@@ -58,7 +42,6 @@ class Broadcast:
     namespaces: List[Namespace]
     listeners: List[Listener]
 
-    dispatcher_interface: DispatcherInterface
     decorator_interface: DecoratorInterface
 
     event_ctx: Ctx[Dispatchable]
diff --git a/src/graia/broadcast/builtin/decorators.py b/src/graia/broadcast/builtin/decorators.py
index f243a88..64c737f 100644
--- a/src/graia/broadcast/builtin/decorators.py
+++ b/src/graia/broadcast/builtin/decorators.py
@@ -1,5 +1,5 @@
 import typing
-from typing import Any, Callable, Optional
+from typing import Any, Callable, Optional, Union
 
 from ..entities.decorator import Decorator
 from ..entities.exectarget import ExecTarget
@@ -42,12 +42,15 @@ def __init__(self, origin: Any):
         self.origin = origin
 
     async def target(self, interface: DecoratorInterface) -> Optional[Any]:
+        annotation = interface.annotation
+        if typing.get_origin(annotation) is Union:
+            annotation = Union[tuple(x for x in typing.get_args(annotation) if x not in (None, type(None)))]  # type: ignore
         try:
             return Force(
-                await interface.dispatcher_interface.lookup_param(
+                await interface.dispatcher_interface.lookup_by_directly(
+                    interface,
                     interface.dispatcher_interface.name,
-                    typing.get_origin(interface.dispatcher_interface.annotation)
-                    or interface.dispatcher_interface.annotation,
+                    annotation,
                     self.origin,
                 )
             )
diff --git a/src/graia/broadcast/interfaces/dispatcher.py b/src/graia/broadcast/interfaces/dispatcher.py
index 3f3d652..7a320c9 100644
--- a/src/graia/broadcast/interfaces/dispatcher.py
+++ b/src/graia/broadcast/interfaces/dispatcher.py
@@ -1,4 +1,14 @@
-from typing import TYPE_CHECKING, Any, ClassVar, Dict, Generic, List, Set, Tuple, TypeVar
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    ClassVar,
+    Dict,
+    Generic,
+    List,
+    Set,
+    Tuple,
+    TypeVar,
+)
 
 from ..entities.dispatcher import BaseDispatcher
 from ..entities.event import Dispatchable
diff --git a/src/graia/broadcast/utilles.py b/src/graia/broadcast/utilles.py
index d011a9b..71a0afd 100644
--- a/src/graia/broadcast/utilles.py
+++ b/src/graia/broadcast/utilles.py
@@ -1,4 +1,5 @@
 import inspect
+from collections import UserList
 from contextlib import contextmanager
 from contextvars import ContextVar, Token
 from functools import lru_cache
@@ -18,7 +19,6 @@
     Union,
 )
 
-
 from .entities.dispatcher import BaseDispatcher
 
 if TYPE_CHECKING:
@@ -71,6 +71,20 @@ def printer(value: Any):
     return value
 
 
+class DebugList(UserList):
+    def extend(self, item) -> None:
+        print(item)
+        return super().extend(item)
+
+    def append(self, item) -> None:
+        print(item)
+        return super().append(item)
+
+    def insert(self, i: int, item) -> None:
+        print(i, item)
+        return super().insert(i, item)
+
+
 def group_dict(iterable: Iterable, key_callable: Callable[[Any], Any]):
     temp = {}
     for i in iterable:
diff --git a/src/test.py b/src/test.py
index 32e149a..9fbe1dd 100644
--- a/src/test.py
+++ b/src/test.py
@@ -4,6 +4,7 @@
 # import copy
 import functools
 import random
+import sys
 import time
 from typing import Any, Generator, Tuple, Union
 
@@ -21,8 +22,6 @@
 from graia.broadcast.interrupt.waiter import Waiter
 from graia.broadcast.utilles import dispatcher_mixin_handler
 
-import sys
-
 
 class TestDispatcher(BaseDispatcher):
     @staticmethod
diff --git a/src/test/chain_post.py b/src/test/chain_post.py
new file mode 100644
index 0000000..01a6418
--- /dev/null
+++ b/src/test/chain_post.py
@@ -0,0 +1,79 @@
+import asyncio
+
+# import objgraph
+# import copy
+import functools
+import random
+import sys
+import time
+from typing import Any, Generator, Tuple, Union
+
+import pytest
+
+from graia.broadcast import Broadcast
+from graia.broadcast.builtin.decorators import Depend
+from graia.broadcast.entities.decorator import Decorator
+from graia.broadcast.entities.dispatcher import BaseDispatcher
+from graia.broadcast.entities.event import Dispatchable
+from graia.broadcast.entities.exectarget import ExecTarget
+from graia.broadcast.entities.listener import Listener
+from graia.broadcast.exceptions import ExecutionStop, PropagationCancelled
+from graia.broadcast.interfaces.decorator import DecoratorInterface
+from graia.broadcast.interfaces.dispatcher import DispatcherInterface
+from graia.broadcast.interrupt import InterruptControl
+from graia.broadcast.interrupt.waiter import Waiter
+from graia.broadcast.utilles import dispatcher_mixin_handler
+
+
+class TestDispatcher(BaseDispatcher):
+    @staticmethod
+    async def catch(interface: DispatcherInterface):
+        if interface.name == "ster":
+            return 1
+
+
+class TestEvent1(Dispatchable):
+    class Dispatcher(BaseDispatcher):
+        @staticmethod
+        async def catch(interface: "DispatcherInterface"):
+            if interface.name == "ster":
+                return "1"
+            elif interface.name == "ster1":
+                return "res_ster_1"
+
+
+class TestEvent2(Dispatchable):
+    class Dispatcher(BaseDispatcher):
+        @staticmethod
+        async def catch(interface: "DispatcherInterface"):
+            if interface.name == "ster":
+                return "res_ster"
+
+
+@pytest.mark.asyncio
+async def test_():
+    event = TestEvent1()
+
+    broadcast = Broadcast(
+        loop=asyncio.get_running_loop(),
+        debug_flag=False,
+    )
+
+    finish = []
+
+    @broadcast.receiver(TestEvent1)
+    async def s(e: TestEvent1, ster, ster1):
+        assert ster == "1"
+        assert ster1 == "res_ster_1"
+        broadcast.postEvent(TestEvent2(), e)
+
+    @broadcast.receiver(TestEvent2)
+    async def t(e: TestEvent2, ster, ster1):
+        assert isinstance(e, TestEvent2)
+        assert ster == "res_ster"
+        assert ster1 == "res_ster_1"
+        finish.append(1)
+
+    await broadcast.postEvent(event)
+
+    assert finish
diff --git a/src/test/deco.py b/src/test/deco.py
new file mode 100644
index 0000000..d05bc45
--- /dev/null
+++ b/src/test/deco.py
@@ -0,0 +1,167 @@
+import asyncio
+from typing import Optional
+
+import pytest
+
+from graia.broadcast import Broadcast
+from graia.broadcast.builtin.decorators import Depend, OptionalParam
+from graia.broadcast.entities.decorator import Decorator
+from graia.broadcast.entities.dispatcher import BaseDispatcher
+from graia.broadcast.entities.event import Dispatchable
+from graia.broadcast.entities.signatures import Force
+from graia.broadcast.interfaces.decorator import DecoratorInterface
+from graia.broadcast.interfaces.dispatcher import DispatcherInterface
+
+
+class TestDispatcher(BaseDispatcher):
+    @staticmethod
+    async def catch(interface: DispatcherInterface):
+        if interface.name == "p":
+            return 1
+
+
+class TestEvent(Dispatchable):
+    class Dispatcher(BaseDispatcher):
+        @staticmethod
+        async def catch(interface: "DispatcherInterface"):
+            if interface.name == "ster":
+                return "1"
+
+
+class AsInt(Decorator):
+    async def target(self, interface: "DecoratorInterface"):
+        return int(interface.return_value) + 1
+
+
+class Integer(Decorator):
+    o: int
+
+    pre = True
+
+    def __init__(self) -> None:
+        self.o = 0
+
+    async def target(self, interface: "DecoratorInterface"):
+        if interface.name == "int_name":
+            return int.__name__
+        if interface.annotation is type:
+            return int
+        if interface.event.__class__ == TestEvent and interface.name == "te":
+            return -1
+        self.o += 1
+        return self.o
+
+
+class IntWhenInt(Decorator):
+    pre = True
+
+    async def target(self, interface: "DecoratorInterface"):
+        if interface.annotation is int:
+            return 1
+
+
+@pytest.mark.asyncio
+async def test_optional_param():
+    bcc = Broadcast(
+        loop=asyncio.get_running_loop(),
+    )
+
+    executed = []
+
+    @bcc.receiver(TestEvent)
+    async def _(
+        string: Optional[str] = OptionalParam(IntWhenInt()),
+        val: Optional[int] = OptionalParam(IntWhenInt()),
+        integer: int = OptionalParam(IntWhenInt()),
+    ):
+        assert string is None
+        assert val is 1
+        assert integer is 1
+        executed.append(1)
+
+    @bcc.receiver(TestEvent)
+    async def _(
+        val: Optional[int] = OptionalParam(AsInt()),
+    ):
+        assert val is None
+        executed.append(1)
+
+    await bcc.postEvent(TestEvent())
+
+    assert len(executed) == 2
+
+
+def test_force_recurse():
+    assert Force(Force(Force(None))).target == Force(None).target == Force().target == None
+
+
+@pytest.mark.asyncio
+async def test_decorator():
+    bcc = Broadcast(
+        loop=asyncio.get_running_loop(),
+    )
+    deco = AsInt()
+    executed = []
+
+    @bcc.receiver(TestEvent)
+    async def _(ster=deco):
+        assert ster == 2
+        executed.append(1)
+
+    await bcc.postEvent(TestEvent())
+
+    assert executed
+
+
+@pytest.mark.asyncio
+async def test_decorator_pre():
+    bcc = Broadcast(
+        loop=asyncio.get_running_loop(),
+    )
+
+    executed = []
+
+    deco = Integer()
+
+    @bcc.receiver(TestEvent)
+    async def _(ster=deco, te=deco, int_name=deco, typ: type = deco):
+        assert te == -1
+        assert int_name == int.__name__
+        assert typ == int
+        assert ster == deco.o
+        executed.append(1)
+
+    for _ in range(5):
+        await bcc.postEvent(TestEvent())
+
+    assert len(executed) == 5
+
+
+async def dep(ster: str, p: int):
+    return f"{ster}+{p}"
+
+
+@pytest.mark.asyncio
+async def test_depend():
+    bcc = Broadcast(
+        loop=asyncio.get_running_loop(),
+    )
+
+    executed = []
+
+    @bcc.receiver(TestEvent, dispatchers=[TestDispatcher])
+    async def _(ster=Depend(dep)):
+        assert ster == "1+1"
+        executed.append(1)
+
+    depend = Depend(dep, cache=True)
+
+    @bcc.receiver(TestEvent, dispatchers=[TestDispatcher])
+    async def _(a=depend, b=depend):
+        assert a == b == "1+1"
+        executed.append(1)
+
+    for _ in range(5):
+        await bcc.postEvent(TestEvent())
+
+    assert len(executed) == 10
diff --git a/src/test/dispatch.py b/src/test/dispatch.py
new file mode 100644
index 0000000..8e92ae9
--- /dev/null
+++ b/src/test/dispatch.py
@@ -0,0 +1,115 @@
+import asyncio
+
+import pytest
+
+from graia.broadcast import Broadcast
+from graia.broadcast.entities.dispatcher import BaseDispatcher
+from graia.broadcast.entities.event import Dispatchable
+from graia.broadcast.entities.signatures import Force
+from graia.broadcast.interfaces.dispatcher import DispatcherInterface
+
+
+class TestDispatcher(BaseDispatcher):
+    @staticmethod
+    async def catch(interface: DispatcherInterface):
+        if interface.name == "p":
+            return "P_dispatcher"
+        elif interface.name == "f":
+            return Force(2)
+
+
+class TestEvent(Dispatchable):
+    class Dispatcher(BaseDispatcher):
+        @staticmethod
+        async def catch(interface: "DispatcherInterface"):
+            if interface.name == "ster":
+                return "1"
+            if interface.name == "p":
+                return "P_event"
+
+
+@pytest.mark.asyncio
+async def test_lookup_directly():
+    bcc = Broadcast(
+        loop=asyncio.get_running_loop(),
+    )
+
+    dii = DispatcherInterface(bcc, [])
+
+    assert await dii.lookup_by_directly(TestDispatcher, "p", None, None) == "P_dispatcher"
+    assert await dii.lookup_by_directly(TestDispatcher, "f", None, None) == 2
+
+
+@pytest.mark.asyncio
+async def test_insert():
+    bcc = Broadcast(
+        loop=asyncio.get_running_loop(),
+    )
+
+    dii = DispatcherInterface(bcc, [])
+
+    t_a = TestDispatcher()
+    t_b = TestDispatcher()
+    dii.inject_execution_raw(t_a, t_b)
+    assert dii.dispatchers == [t_b, t_a]
+
+
+@pytest.mark.asyncio
+async def test_event_dispatch():
+    bcc = Broadcast(
+        loop=asyncio.get_running_loop(),
+    )
+
+    executed = []
+
+    @bcc.receiver(TestEvent)
+    async def _1(ster, p, b: Broadcast, i: DispatcherInterface):
+        assert ster == "1"
+        assert p == "P_event"
+        assert b is bcc
+        assert i.__class__ == DispatcherInterface
+        executed.append(1)
+
+    await bcc.postEvent(TestEvent())
+
+    assert len(executed) == 1
+
+
+@pytest.mark.asyncio
+async def test_dispatcher_catch():
+    bcc = Broadcast(
+        loop=asyncio.get_running_loop(),
+    )
+
+    executed = []
+
+    @bcc.receiver(TestEvent, dispatchers=[TestDispatcher])
+    async def _1(f, b: Broadcast, i: DispatcherInterface):
+        assert f == 2
+        assert b is bcc
+        assert i.__class__ == DispatcherInterface
+        executed.append(1)
+
+    await bcc.postEvent(TestEvent())
+
+    assert len(executed) == 1
+
+
+@pytest.mark.asyncio
+@pytest.mark.xfail  # need further discussion
+async def test_dispatcher_priority():
+    bcc = Broadcast(
+        loop=asyncio.get_running_loop(),
+    )
+
+    executed = []
+
+    @bcc.receiver(TestEvent, dispatchers=[TestDispatcher])
+    async def _2(ster, p):
+        assert ster == "1"
+        assert p == "P_dispatcher"
+        executed.append(1)
+
+    await bcc.postEvent(TestEvent())
+
+    assert len(executed) == 1
diff --git a/src/test/get_throw.py b/src/test/get_throw.py
new file mode 100644
index 0000000..80ebb23
--- /dev/null
+++ b/src/test/get_throw.py
@@ -0,0 +1,50 @@
+import asyncio
+
+import pytest
+
+from graia.broadcast import Broadcast
+from graia.broadcast.builtin.event import ExceptionThrowed
+from graia.broadcast.entities.dispatcher import BaseDispatcher
+from graia.broadcast.entities.event import Dispatchable
+from graia.broadcast.interfaces.dispatcher import DispatcherInterface
+
+
+class TestDispatcher(BaseDispatcher):
+    @staticmethod
+    async def catch(interface: DispatcherInterface):
+        if interface.name == "p":
+            return 1
+
+
+class TestEvent(Dispatchable):
+    class Dispatcher(BaseDispatcher):
+        @staticmethod
+        async def catch(interface: "DispatcherInterface"):
+            if interface.name == "ster":
+                return "1"
+
+
+@pytest.mark.asyncio
+async def test_get_exc():
+    bcc = Broadcast(
+        loop=asyncio.get_running_loop(),
+    )
+    executed = []
+
+    @bcc.receiver(TestEvent)
+    async def _():
+        executed.append(1)
+        raise Exception("test")
+
+    @bcc.receiver(ExceptionThrowed, dispatchers=[TestDispatcher])
+    async def _(ev: ExceptionThrowed, event, exc: Exception, p):
+        executed.append(1)
+        assert ev.event.__class__ == event.__class__ == TestEvent
+        assert ev.exception.__class__ == exc.__class__ == Exception
+        assert ev.exception.args == ("test",)
+        assert p == 1
+        executed.append(1)
+
+    await bcc.postEvent(TestEvent())
+
+    assert len(executed) == 3
diff --git a/src/test/method.py b/src/test/method.py
new file mode 100644
index 0000000..8009e74
--- /dev/null
+++ b/src/test/method.py
@@ -0,0 +1,35 @@
+import asyncio
+
+import pytest
+
+from graia.broadcast import Broadcast
+from graia.broadcast.entities.dispatcher import BaseDispatcher
+from graia.broadcast.entities.event import Dispatchable
+from graia.broadcast.entities.signatures import Force
+from graia.broadcast.exceptions import InvalidEventName
+from graia.broadcast.interfaces.dispatcher import DispatcherInterface
+
+
+class TestEvent(Dispatchable):
+    class Dispatcher(BaseDispatcher):
+        @staticmethod
+        async def catch(interface: "DispatcherInterface"):
+            if interface.name == "ster":
+                return "1"
+
+
+class ChainEvent(TestEvent):
+    ...
+
+
+class NestedEvent(ChainEvent):
+    ...
+
+
+@pytest.mark.asyncio
+async def test_fail_lookup():
+    bcc = Broadcast(loop=asyncio.get_running_loop())
+
+    with pytest.raises(InvalidEventName):
+        bcc.receiver("ImaginaryEvent")(lambda: ...)
+    bcc.receiver("NestedEvent")(lambda: ...)
diff --git a/src/test_double.py b/src/test_double.py
index c4474d9..4cb94e7 100644
--- a/src/test_double.py
+++ b/src/test_double.py
@@ -4,6 +4,7 @@
 # import copy
 import functools
 import random
+import sys
 import time
 from typing import Any, Generator, Tuple, Union
 
@@ -21,8 +22,6 @@
 from graia.broadcast.interrupt.waiter import Waiter
 from graia.broadcast.utilles import dispatcher_mixin_handler
 
-import sys
-
 
 class TestDispatcher(BaseDispatcher):
     @staticmethod