Repository: mcous/decoy (language: python)

Issue:
feature: argument captor matcher
## Overview

When dealing with certain types of API's, especially callback APIs, sometimes you need access to the value with which a method was invoked.

See [testdouble](https://github.com/testdouble/testdouble.js/blob/main/docs/6-verifying-invocations.md#multi-phase-assertions-with-argument-captors) for more details about why this is useful.

## Proposal

```py
from decoy import Decoy, matchers

class Subject:
    def __init__(self, emitter, actor):
       ...

class Emitter:
    def register_listener(self, callback):
        ...

class Actor:
    def act(self, value):
         ...

def test_callback():
    decoy = Decoy()
    emitter = Decoy.create_decoy(spec=Emitter)
    actor = Decoy.create_decoy(spec=Actor)
    subject = Subject(emitter, actor)

    subject.setup()
    
    captor = matchers.captor()
    decoy.verify(emitter.register_listener(captor))

    event_payload = "hello world"
    captor.value(event_payload)

    decoy.verify(actor.act("hello world"))
```



Discussion / hints:

Fix patch:
diff --git a/README.md b/README.md
index 23d6b40..0878d55 100644
--- a/README.md
+++ b/README.md
@@ -198,3 +198,41 @@ def test_log_warning(decoy: Decoy):
         logger.warn(matchers.StringMatching("request ID abc123efg456"))
     )
 ```
+
+#### Capturing values with `matchers.captor`
+
+When testing certain APIs, especially callback APIs, it can be helpful to capture the values of arguments passed to a given decoy.
+
+For example, our test subject may register an anonymous event listener handler with a dependency, and we want to test our subject's behavior when the event listener is triggered.
+
+```py
+import pytest
+from typing import cast, Optional
+from decoy import Decoy, matchers
+
+from .event_source import EventSource
+from .event_consumer import EventConsumer
+
+
+def test_event_listener(decoy: Decoy):
+    event_source = decoy.create_decoy(spec=EventSource)
+    subject = EventConsumer(event_source=event_source)
+    captor = matchers.Captor()
+
+    # subject registers its listener when started
+    subject.start_consuming()
+
+    # verify listener attached and capture the listener
+    decoy.verify(event_source.register(event_listener=captor))
+
+    # trigger the listener
+    event_handler = captor.value  # or, equivalently, captor.values[0]
+
+    assert subject.has_heard_event is False
+    event_handler()
+    assert subject.has_heard_event is True
+```
+
+This is a pretty verbose way of writing a test, so in general, you may want to approach using `matchers.captor` as a form of potential code smell / test pain. There are often better ways to structure your code for these sorts of interactions that don't involve anonymous / private functions.
+
+For further reading on when (or rather, when not) to use argument captors, check out [testdouble's documentation on its argument captor matcher](https://github.com/testdouble/testdouble.js/blob/main/docs/6-verifying-invocations.md#tdmatcherscaptor).
diff --git a/decoy/matchers.py b/decoy/matchers.py
index fa1f376..a13e93d 100644
--- a/decoy/matchers.py
+++ b/decoy/matchers.py
@@ -25,7 +25,7 @@ def test_logger_called(decoy: Decoy):
     equality comparisons for stubbing and verification.
 """
 from re import compile as compile_re
-from typing import cast, Any, Optional, Pattern, Type
+from typing import cast, Any, List, Optional, Pattern, Type
 
 
 __all__ = [
@@ -34,6 +34,7 @@ def test_logger_called(decoy: Decoy):
     "IsNot",
     "StringMatching",
     "ErrorMatching",
+    "Captor",
 ]
 
 
@@ -197,3 +198,52 @@ def ErrorMatching(error: Type[Exception], match: Optional[str] = None) -> Except
         ```
     """
     return cast(Exception, _ErrorMatching(error, match))
+
+
+class _Captor:
+    def __init__(self) -> None:
+        self._values: List[Any] = []
+
+    def __eq__(self, target: object) -> bool:
+        """Capture compared value, always returning True."""
+        self._values.append(target)
+        return True
+
+    def __repr__(self) -> str:
+        """Return a string representation of the matcher."""
+        return "<Captor>"
+
+    @property
+    def value(self) -> Any:
+        """Get the captured value.
+
+        Raises:
+            AssertionError: if no value was captured.
+        """
+        if len(self._values) == 0:
+            raise AssertionError("No value captured by captor.")
+
+        return self._values[-1]
+
+    @property
+    def values(self) -> List[Any]:
+        """Get all captured values."""
+        return self._values
+
+
+def Captor() -> Any:
+    """Match anything, capturing its value.
+
+    The last captured value will be set to `captor.value`. All captured
+    values will be placed in the `captor.values` list, which can be
+    helpful if a captor needs to be triggered multiple times.
+
+    Example:
+        ```python
+        captor = Captor()
+        assert "foobar" == captor
+        print(captor.value)  # "foobar"
+        print(captor.values)  # ["foobar"]
+        ```
+    """
+    return _Captor()
diff --git a/decoy/mypy/__init__.py b/decoy/mypy/__init__.py
new file mode 100644
index 0000000..d8c88d2
--- /dev/null
+++ b/decoy/mypy/__init__.py
@@ -0,0 +1,4 @@
+"""Decoy mypy plugin entrypoint."""
+from .plugin import plugin
+
+__all__ = ["plugin"]
diff --git a/decoy/mypy.py b/decoy/mypy/plugin.py
similarity index 100%
rename from decoy/mypy.py
rename to decoy/mypy/plugin.py
diff --git a/decoy/spy.py b/decoy/spy.py
index c9ec0e8..3168067 100644
--- a/decoy/spy.py
+++ b/decoy/spy.py
@@ -83,7 +83,7 @@ def __getattr__(self, name: str) -> Any:
                 # according to Python, `get_type_hints` will raise.
                 # Rather than fail to create a spy with an inscrutable error,
                 # gracefully fallback to a specification-less spy.
-                hints = get_type_hints(self._spec)  # type: ignore[arg-type]
+                hints = get_type_hints(self._spec)
                 child_spec = getattr(
                     self._spec,
                     name,
diff --git a/mypy.ini b/mypy.ini
index 7231276..056f52f 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -2,4 +2,4 @@
 files = decoy,tests
 strict = True
 show_error_codes = True
-plugins = decoy.mypy
+plugins = decoy/mypy/plugin.py
diff --git a/poetry.lock b/poetry.lock
index 52395af..a78c4f6 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -14,6 +14,17 @@ category = "dev"
 optional = false
 python-versions = "*"
 
+[[package]]
+name = "astunparse"
+version = "1.6.3"
+description = "An AST unparser for Python"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+six = ">=1.6.1,<2.0"
+
 [[package]]
 name = "atomicwrites"
 version = "1.4.0"
@@ -24,62 +35,60 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "attrs"
-version = "20.3.0"
+version = "21.2.0"
 description = "Classes Without Boilerplate"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[package.extras]
-dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "furo", "sphinx", "pre-commit"]
-docs = ["furo", "sphinx", "zope.interface"]
-tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
-tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
-
-[[package]]
-name = "beautifulsoup4"
-version = "4.9.3"
-description = "Screen-scraping library"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[package.dependencies]
-soupsieve = {version = ">1.2", markers = "python_version >= \"3.0\""}
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.extras]
-html5lib = ["html5lib"]
-lxml = ["lxml"]
+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"]
+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"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins"]
 
 [[package]]
 name = "black"
-version = "20.8b1"
+version = "21.5b1"
 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"
+pathspec = ">=0.8.1,<1"
 regex = ">=2020.1.8"
 toml = ">=0.10.1"
-typed-ast = ">=1.4.0"
-typing-extensions = ">=3.7.4"
+typed-ast = {version = ">=1.4.2", markers = "python_version < \"3.8\""}
+typing-extensions = {version = ">=3.7.4", markers = "python_version < \"3.8\""}
 
 [package.extras]
 colorama = ["colorama (>=0.4.3)"]
-d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]
+d = ["aiohttp (>=3.6.0)", "aiohttp-cors"]
+python2 = ["typed-ast (>=1.4.2)"]
+
+[[package]]
+name = "cached-property"
+version = "1.5.2"
+description = "A decorator for caching properties in classes."
+category = "dev"
+optional = false
+python-versions = "*"
 
 [[package]]
 name = "click"
-version = "7.1.2"
+version = "8.0.1"
 description = "Composable command line interface toolkit"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.6"
+
+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 
 [[package]]
 name = "colorama"
@@ -91,19 +100,19 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "decorator"
-version = "4.4.2"
+version = "5.0.9"
 description = "Decorators for Humans"
 category = "dev"
 optional = false
-python-versions = ">=2.6, !=3.0.*, !=3.1.*"
+python-versions = ">=3.5"
 
 [[package]]
 name = "execnet"
-version = "1.7.1"
+version = "1.8.1"
 description = "execnet: rapid multi-Python deployment"
 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.dependencies]
 apipkg = ">=1.4"
@@ -113,33 +122,33 @@ testing = ["pre-commit"]
 
 [[package]]
 name = "flake8"
-version = "3.8.4"
+version = "3.9.2"
 description = "the modular source code checker: pep8 pyflakes and co"
 category = "dev"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
 
 [package.dependencies]
 importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 mccabe = ">=0.6.0,<0.7.0"
-pycodestyle = ">=2.6.0a1,<2.7.0"
-pyflakes = ">=2.2.0,<2.3.0"
+pycodestyle = ">=2.7.0,<2.8.0"
+pyflakes = ">=2.3.0,<2.4.0"
 
 [[package]]
 name = "flake8-annotations"
-version = "2.4.1"
+version = "2.6.2"
 description = "Flake8 Type Annotation Checks"
 category = "dev"
 optional = false
 python-versions = ">=3.6.1,<4.0.0"
 
 [package.dependencies]
-flake8 = ">=3.7,<3.9"
+flake8 = ">=3.7,<4.0"
 typed-ast = {version = ">=1.4,<2.0", markers = "python_version < \"3.8\""}
 
 [[package]]
 name = "flake8-docstrings"
-version = "1.5.0"
+version = "1.6.0"
 description = "Extension for flake8 which uses pydocstyle to check docstrings"
 category = "dev"
 optional = false
@@ -159,18 +168,19 @@ python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "importlib-metadata"
-version = "3.1.1"
+version = "4.3.1"
 description = "Read metadata from Python packages"
 category = "dev"
 optional = false
 python-versions = ">=3.6"
 
 [package.dependencies]
+typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
 zipp = ">=0.5"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "jaraco.test (>=3.2.0)", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+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]]
 name = "iniconfig"
@@ -182,22 +192,22 @@ python-versions = "*"
 
 [[package]]
 name = "jinja2"
-version = "2.11.2"
+version = "3.0.1"
 description = "A very fast and expressive template engine."
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.6"
 
 [package.dependencies]
-MarkupSafe = ">=0.23"
+MarkupSafe = ">=2.0"
 
 [package.extras]
-i18n = ["Babel (>=0.8)"]
+i18n = ["Babel (>=2.7)"]
 
 [[package]]
 name = "joblib"
-version = "0.17.0"
-description = "Lightweight pipelining: using Python functions as pipeline jobs."
+version = "1.0.1"
+description = "Lightweight pipelining with Python functions"
 category = "dev"
 optional = false
 python-versions = ">=3.6"
@@ -232,7 +242,7 @@ languages = ["nltk (>=3.2.5,<3.5)", "nltk (>=3.2.5)"]
 
 [[package]]
 name = "markdown"
-version = "3.3.3"
+version = "3.3.4"
 description = "Python implementation of Markdown."
 category = "dev"
 optional = false
@@ -246,11 +256,11 @@ testing = ["coverage", "pyyaml"]
 
 [[package]]
 name = "markupsafe"
-version = "1.1.1"
+version = "2.0.1"
 description = "Safely add untrusted strings to HTML/XML markup."
 category = "dev"
 optional = false
-python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
+python-versions = ">=3.6"
 
 [[package]]
 name = "mccabe"
@@ -277,9 +287,21 @@ Markdown = ">=3.2.1"
 PyYAML = ">=3.10"
 tornado = ">=5.0"
 
+[[package]]
+name = "mkdocs-autorefs"
+version = "0.2.1"
+description = "Automatically link across pages in MkDocs."
+category = "dev"
+optional = false
+python-versions = ">=3.6,<4.0"
+
+[package.dependencies]
+Markdown = ">=3.3,<4.0"
+mkdocs = ">=1.1,<2.0"
+
 [[package]]
 name = "mkdocs-material"
-version = "6.1.6"
+version = "7.1.6"
 description = "A Material Design theme for MkDocs"
 category = "dev"
 optional = false
@@ -305,24 +327,24 @@ mkdocs-material = ">=5.0.0"
 
 [[package]]
 name = "mkdocstrings"
-version = "0.13.6"
+version = "0.15.1"
 description = "Automatic documentation from sources, for MkDocs."
 category = "dev"
 optional = false
 python-versions = ">=3.6,<4.0"
 
 [package.dependencies]
-beautifulsoup4 = ">=4.8.2,<5.0.0"
+Jinja2 = ">=2.11.1,<4.0"
+Markdown = ">=3.3,<4.0"
+MarkupSafe = ">=1.1,<3.0"
 mkdocs = ">=1.1,<2.0"
+mkdocs-autorefs = ">=0.1,<0.3"
 pymdown-extensions = ">=6.3,<9.0"
-pytkdocs = ">=0.2.0,<0.10.0"
-
-[package.extras]
-tests = ["coverage (>=5.2.1,<6.0.0)", "invoke (>=1.4.1,<2.0.0)", "mkdocs-material (>=5.5.12,<6.0.0)", "mypy (>=0.782,<0.783)", "pytest (>=6.0.1,<7.0.0)", "pytest-cov (>=2.10.1,<3.0.0)", "pytest-randomly (>=3.4.1,<4.0.0)", "pytest-sugar (>=0.9.4,<0.10.0)", "pytest-xdist (>=2.1.0,<3.0.0)"]
+pytkdocs = ">=0.2.0,<0.12.0"
 
 [[package]]
 name = "mypy"
-version = "0.790"
+version = "0.812"
 description = "Optional static typing for Python"
 category = "dev"
 optional = false
@@ -346,11 +368,11 @@ python-versions = "*"
 
 [[package]]
 name = "nltk"
-version = "3.5"
+version = "3.6.2"
 description = "Natural Language Toolkit"
 category = "dev"
 optional = false
-python-versions = "*"
+python-versions = ">=3.5.*"
 
 [package.dependencies]
 click = "*"
@@ -359,16 +381,16 @@ regex = "*"
 tqdm = "*"
 
 [package.extras]
-all = ["requests", "numpy", "python-crfsuite", "scikit-learn", "twython", "pyparsing", "scipy", "matplotlib", "gensim"]
+all = ["matplotlib", "twython", "scipy", "numpy", "gensim (<4.0.0)", "python-crfsuite", "pyparsing", "scikit-learn", "requests"]
 corenlp = ["requests"]
-machine_learning = ["gensim", "numpy", "python-crfsuite", "scikit-learn", "scipy"]
+machine_learning = ["gensim (<4.0.0)", "numpy", "python-crfsuite", "scikit-learn", "scipy"]
 plot = ["matplotlib"]
 tgrep = ["pyparsing"]
 twitter = ["twython"]
 
 [[package]]
 name = "packaging"
-version = "20.7"
+version = "20.9"
 description = "Core utilities for Python packages"
 category = "dev"
 optional = false
@@ -401,7 +423,7 @@ dev = ["pre-commit", "tox"]
 
 [[package]]
 name = "py"
-version = "1.9.0"
+version = "1.10.0"
 description = "library with cross-python path, ini-parsing, io, code, log facilities"
 category = "dev"
 optional = false
@@ -409,7 +431,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "pycodestyle"
-version = "2.6.0"
+version = "2.7.0"
 description = "Python style guide checker"
 category = "dev"
 optional = false
@@ -417,18 +439,21 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "pydocstyle"
-version = "5.1.1"
+version = "6.1.1"
 description = "Python docstring style checker"
 category = "dev"
 optional = false
-python-versions = ">=3.5"
+python-versions = ">=3.6"
 
 [package.dependencies]
 snowballstemmer = "*"
 
+[package.extras]
+toml = ["toml"]
+
 [[package]]
 name = "pyflakes"
-version = "2.2.0"
+version = "2.3.1"
 description = "passive checker of Python programs"
 category = "dev"
 optional = false
@@ -436,7 +461,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "pygments"
-version = "2.7.2"
+version = "2.9.0"
 description = "Pygments is a syntax highlighting package written in Python."
 category = "dev"
 optional = false
@@ -444,11 +469,11 @@ python-versions = ">=3.5"
 
 [[package]]
 name = "pymdown-extensions"
-version = "8.0.1"
+version = "8.2"
 description = "Extension pack for Python Markdown."
 category = "dev"
 optional = false
-python-versions = ">=3.5"
+python-versions = ">=3.6"
 
 [package.dependencies]
 Markdown = ">=3.2"
@@ -471,40 +496,39 @@ python-versions = "*"
 
 [[package]]
 name = "pytest"
-version = "6.1.2"
+version = "6.2.4"
 description = "pytest: simple powerful testing with Python"
 category = "dev"
 optional = false
-python-versions = ">=3.5"
+python-versions = ">=3.6"
 
 [package.dependencies]
 atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
-attrs = ">=17.4.0"
+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,<1.0"
+pluggy = ">=0.12,<1.0.0a1"
 py = ">=1.8.2"
 toml = "*"
 
 [package.extras]
-checkqa_mypy = ["mypy (==0.780)"]
 testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
 
 [[package]]
 name = "pytest-asyncio"
-version = "0.14.0"
+version = "0.15.1"
 description = "Pytest support for asyncio."
 category = "dev"
 optional = false
-python-versions = ">= 3.5"
+python-versions = ">= 3.6"
 
 [package.dependencies]
 pytest = ">=5.4.0"
 
 [package.extras]
-testing = ["async-generator (>=1.3)", "coverage", "hypothesis (>=5.7.1)"]
+testing = ["coverage", "hypothesis (>=5.7.1)"]
 
 [[package]]
 name = "pytest-forked"
@@ -520,7 +544,7 @@ pytest = ">=3.10"
 
 [[package]]
 name = "pytest-mypy-plugins"
-version = "1.6.1"
+version = "1.7.0"
 description = "pytest plugin for writing tests for mypy plugins"
 category = "dev"
 optional = false
@@ -535,7 +559,7 @@ pyyaml = "*"
 
 [[package]]
 name = "pytest-xdist"
-version = "2.1.0"
+version = "2.2.1"
 description = "pytest xdist plugin for distributed testing and loop-on-failing modes"
 category = "dev"
 optional = false
@@ -552,26 +576,31 @@ testing = ["filelock"]
 
 [[package]]
 name = "pytkdocs"
-version = "0.9.0"
+version = "0.11.1"
 description = "Load Python objects documentation."
 category = "dev"
 optional = false
-python-versions = ">=3.6,<4.0"
+python-versions = ">=3.6.1,<4.0.0"
+
+[package.dependencies]
+astunparse = {version = ">=1.6.3,<2.0.0", markers = "python_version < \"3.9\""}
+cached-property = {version = ">=1.5.2,<2.0.0", markers = "python_version < \"3.8\""}
+typing-extensions = {version = ">=3.7.4.3,<4.0.0.0", markers = "python_version < \"3.8\""}
 
 [package.extras]
-tests = ["coverage (>=5.2.1,<6.0.0)", "invoke (>=1.4.1,<2.0.0)", "marshmallow (>=3.5.2,<4.0.0)", "mypy (>=0.782,<0.783)", "pydantic (>=1.5.1,<2.0.0)", "pytest (>=6.0.1,<7.0.0)", "pytest-cov (>=2.10.1,<3.0.0)", "pytest-randomly (>=3.4.1,<4.0.0)", "pytest-sugar (>=0.9.4,<0.10.0)", "pytest-xdist (>=2.1.0,<3.0.0)"]
+numpy-style = ["docstring_parser (>=0.7.3,<0.8.0)"]
 
 [[package]]
 name = "pyyaml"
-version = "5.3.1"
+version = "5.4.1"
 description = "YAML parser and emitter for Python"
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
 
 [[package]]
 name = "regex"
-version = "2020.11.13"
+version = "2021.4.4"
 description = "Alternative regular expression module, to replace re."
 category = "dev"
 optional = false
@@ -579,7 +608,7 @@ python-versions = "*"
 
 [[package]]
 name = "six"
-version = "1.15.0"
+version = "1.16.0"
 description = "Python 2 and 3 compatibility utilities"
 category = "dev"
 optional = false
@@ -587,20 +616,12 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "snowballstemmer"
-version = "2.0.0"
-description = "This package provides 26 stemmers for 25 languages generated from Snowball algorithms."
+version = "2.1.0"
+description = "This package provides 29 stemmers for 28 languages generated from Snowball algorithms."
 category = "dev"
 optional = false
 python-versions = "*"
 
-[[package]]
-name = "soupsieve"
-version = "2.0.1"
-description = "A modern CSS selector implementation for Beautiful Soup."
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
 [[package]]
 name = "toml"
 version = "0.10.2"
@@ -619,18 +640,20 @@ python-versions = ">= 3.5"
 
 [[package]]
 name = "tqdm"
-version = "4.54.0"
+version = "4.61.0"
 description = "Fast, Extensible Progress Meter"
 category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
 
 [package.extras]
-dev = ["py-make (>=0.1.0)", "twine", "argopt", "pydoc-markdown", "wheel"]
+dev = ["py-make (>=0.1.0)", "twine", "wheel"]
+notebook = ["ipywidgets (>=6)"]
+telegram = ["requests"]
 
 [[package]]
 name = "typed-ast"
-version = "1.4.1"
+version = "1.4.3"
 description = "a fork of Python 2 and 3 ast modules with type comment support"
 category = "dev"
 optional = false
@@ -638,7 +661,7 @@ python-versions = "*"
 
 [[package]]
 name = "typing-extensions"
-version = "3.7.4.3"
+version = "3.10.0.0"
 description = "Backported and Experimental Type Hints for Python 3.5+"
 category = "dev"
 optional = false
@@ -646,20 +669,20 @@ python-versions = "*"
 
 [[package]]
 name = "zipp"
-version = "3.4.0"
+version = "3.4.1"
 description = "Backport of pathlib-compatible object wrapper for zip files"
 category = "dev"
 optional = false
 python-versions = ">=3.6"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "jaraco.test (>=3.2.0)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=4.6)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "pytest-enabler", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
 
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "5349aa0d10450f120d0eac9a74d79eac97c4f038196e9775db8e6305b7f8b9fd"
+content-hash = "b8a3e792d89c47909fbdb3aceb52cad6c7e1b9955f95f9a5b008f4a2be5226ad"
 
 [metadata.files]
 apipkg = [
@@ -670,68 +693,72 @@ appdirs = [
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 ]
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+    {file = "astunparse-1.6.3.tar.gz", hash = "sha256:5ad93a8456f0d084c3456d059fd9a92cce667963232cbf763eac3bc5b7940872"},
+]
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@@ -741,43 +768,44 @@ lunr = [
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 ]
 typing-extensions = [
-    {file = "typing_extensions-3.7.4.3-py2-none-any.whl", hash = "sha256:dafc7639cde7f1b6e1acc0f457842a83e722ccca8eef5270af2d74792619a89f"},
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+    {file = "typing_extensions-3.10.0.0-py2-none-any.whl", hash = "sha256:0ac0f89795dd19de6b97debb0c6af1c70987fd80a2d62d1958f7e56fcc31b497"},
+    {file = "typing_extensions-3.10.0.0-py3-none-any.whl", hash = "sha256:779383f6086d90c99ae41cf0ff39aac8a7937a9283ce0a414e5dd782f4c94a84"},
+    {file = "typing_extensions-3.10.0.0.tar.gz", hash = "sha256:50b6f157849174217d0656f99dc82fe932884fb250826c18350e159ec6cdf342"},
 ]
 zipp = [
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-    {file = "zipp-3.4.0.tar.gz", hash = "sha256:ed5eee1974372595f9e416cc7bbeeb12335201d8081ca8a0743c954d4446e5cb"},
+    {file = "zipp-3.4.1-py3-none-any.whl", hash = "sha256:51cb66cc54621609dd593d1787f286ee42a5c0adbb4b29abea5a63edc3e03098"},
+    {file = "zipp-3.4.1.tar.gz", hash = "sha256:3607921face881ba3e026887d8150cca609d517579abe052ac81fc5aeffdbd76"},
 ]
diff --git a/pyproject.toml b/pyproject.toml
index b7552d0..d371d75 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,23 +22,22 @@ classifiers = [
 python = "^3.7"
 
 [tool.poetry.dev-dependencies]
-black = "^20.8b1"
+black = "^21.5b1"
 flake8 = "^3.8.4"
 flake8-annotations = "^2.4.1"
 flake8-docstrings = "^1.5.0"
 mkdocs = "^1.1.2"
-mkdocs-material = "^6.1.6"
-mkdocstrings = "^0.13.6"
-mypy = "^0.790"
+mkdocs-material = "^7.1.6"
+mkdocstrings = "^0.15.1"
+mypy = "^0.812"
 pytest = "^6.1.2"
-pytest-asyncio = "^0.14.0"
+pytest-asyncio = "^0.15.1"
 pytest-mypy-plugins = "^1.6.1"
 pytest-xdist = "^2.1.0"
 
 [tool.pytest.ini_options]
-addopts = "--color=yes --mypy-ini-file=mypy.ini"
+addopts = "--color=yes --mypy-ini-file=tests/typing/mypy.ini"
 
 [build-system]
 requires = ["poetry>=0.12"]
 build-backend = "poetry.masonry.api"
-


Test patch:
diff --git a/tests/test_matchers.py b/tests/test_matchers.py
index 764f17e..2bf8e96 100644
--- a/tests/test_matchers.py
+++ b/tests/test_matchers.py
@@ -1,6 +1,7 @@
 """Matcher tests."""
+import pytest
 from decoy import matchers
-
+from typing import Any, List
 from .common import SomeClass
 
 
@@ -51,3 +52,22 @@ def test_error_matching_matcher() -> None:
     assert RuntimeError("ah!") == matchers.ErrorMatching(RuntimeError, "ah")
     assert RuntimeError("ah!") != matchers.ErrorMatching(TypeError, "ah")
     assert RuntimeError("ah!") != matchers.ErrorMatching(RuntimeError, "ah$")
+
+
+def test_captor_matcher() -> None:
+    """It should have a captor matcher that captures the compared value."""
+    captor = matchers.Captor()
+    comparisons: List[Any] = [1, False, None, {}, [], ("hello", "world"), SomeClass()]
+
+    for i, compare in enumerate(comparisons):
+        assert compare == captor
+        assert captor.value is compare
+        assert captor.values == comparisons[0 : i + 1]
+
+
+def test_captor_matcher_raises_if_no_value() -> None:
+    """The captor matcher should raise an assertion error if no value."""
+    captor = matchers.Captor()
+
+    with pytest.raises(AssertionError, match="No value captured"):
+        captor.value
diff --git a/tests/typing/mypy.ini b/tests/typing/mypy.ini
new file mode 100644
index 0000000..25161eb
--- /dev/null
+++ b/tests/typing/mypy.ini
@@ -0,0 +1,4 @@
+[mypy]
+strict = True
+show_error_codes = True
+plugins = decoy.mypy
diff --git a/tests/typing/test_typing.yml b/tests/typing/test_typing.yml
index 8fe8940..dd0b933 100644
--- a/tests/typing/test_typing.yml
+++ b/tests/typing/test_typing.yml
@@ -57,3 +57,21 @@
       decoy.when(fake("goodbye")).then_return("wrong-type")
   out: |
       main:10: error: Argument 1 to "then_return" of "Stub" has incompatible type "str"; expected "int"  [arg-type]
+
+- case: matchers_mimic_types
+  main: |
+      from decoy import matchers
+
+      reveal_type(matchers.Anything())
+      reveal_type(matchers.IsA(str))
+      reveal_type(matchers.IsNot(str))
+      reveal_type(matchers.StringMatching("foobar"))
+      reveal_type(matchers.ErrorMatching(RuntimeError))
+      reveal_type(matchers.Captor())
+  out: |
+      main:3: note: Revealed type is 'Any'
+      main:4: note: Revealed type is 'Any'
+      main:5: note: Revealed type is 'Any'
+      main:6: note: Revealed type is 'builtins.str'
+      main:7: note: Revealed type is 'builtins.Exception'
+      main:8: note: Revealed type is 'Any'