feat!(pytest plugin): Add a pytest plugin for libtmux (#411)

Add a pytest plugin for libtmux.

This requires doing some things to fix coverage (which changes
when a conrtest.py is moved to a pytest plugin, since code touched
by the pytest plugins isn't incorporated by default). Also code that
normally would run automatically via autouse=True was set to not
be autoused.

Author: tony

Diff for: .coveragerc

@@ -1,15 +1,20 @@
 [run]
+parallel = 1
+branch = 1
+
 omit =
-    test/*
-    */_vendor/*
-    */_*
-    pkg/*
-    */log.py
+    docs/conf.py
+    */_compat.py
 
 [report]
+skip_covered = True
+show_missing = True
 exclude_lines =
-    pragma: no cover
-    def __repr__
-    raise NotImplementedError
-    if __name__ == .__main__.:
-    def parse_args
+    \#\s*pragma: no cover
+    ^\s*raise NotImplementedError\b
+    ^\s*return NotImplemented\b
+    ^\s*assert False(,|$)
+    ^\s*assert_never\(
+
+    ^\s*if TYPE_CHECKING:
+    ^\s*@overload( |$)

Diff for: .github/workflows/tests.yml

@@ -68,7 +68,11 @@ jobs:
           export PATH=$HOME/tmux-builds/tmux-${{ matrix.tmux-version }}/bin:$PATH
           ls $HOME/tmux-builds/tmux-${{ matrix.tmux-version }}/bin
           tmux -V
-          poetry run py.test --cov=./ --cov-report=xml
+          poetry run py.test --cov=./ --cov-append --cov-report=xml
+        env:
+          COV_CORE_SOURCE: .
+          COV_CORE_CONFIG: .coveragerc
+          COV_CORE_DATAFILE: .coverage.eager
       - uses: codecov/codecov-action@v2
         with:
           token: ${{ secrets.CODECOV_TOKEN }}

Diff for: .prettierrc

@@ -1,3 +1,4 @@
 {
-  "printWidth": 100
+  "printWidth": 100,
+  "proseWrap": 'always'
 }

Diff for: README.md

@@ -70,23 +70,23 @@ List sessions:
 
 ```python
 >>> server.list_sessions()
-[Session($... libtmux_...), Session($... ...)]
+[Session($1 ...), Session($0 ...)]
 ```
 
 Find session:
 
 ```python
->>> server.get_by_id('$0')
-Session($... ...)
+>>> server.get_by_id('$1')
+Session($1 ...)
 ```
 
 Find session by dict lookup:
 
 ```python
 >>> server.sessions[0].rename_session('foo')
-Session($... foo)
+Session($1 foo)
 >>> server.find_where({ "session_name": "foo" })
-Session($... foo)
+Session($1 foo)
 ```
 
 Control your session:
@@ -103,7 +103,7 @@ Create new window in the background (don't switch to it):
 
 ```python
 >>> session.new_window(attach=False, window_name="ha in the bg")
-Window(@... ...:ha in the bg, Session($... libtmux_...))
+Window(@2 2:ha in the bg, Session($1 ...))
 ```
 
 Close window:
@@ -118,14 +118,14 @@ Grab remaining tmux window:
 ```python
 >>> window = session.attached_window
 >>> window.split_window(attach=False)
-Pane(%... Window(@... ...:..., Session($... libtmux_...)))
+Pane(%2 Window(@1 1:... Session($1 ...)))
 ```
 
 Rename window:
 
 ```python
 >>> window.rename_window('libtmuxower')
-Window(@... ...:libtmuxower, Session($... ...))
+Window(@1 1:libtmuxower, Session($1 ...))
 ```
 
 Split window (create a new pane):
@@ -134,13 +134,13 @@ Split window (create a new pane):
 >>> pane = window.split_window()
 >>> pane = window.split_window(attach=False)
 >>> pane.select_pane()
-Pane(%... Window(@... ...:..., Session($... libtmux_...)))
+Pane(%3 Window(@1 1:..., Session($1 ...)))
 >>> window = session.new_window(attach=False, window_name="test")
 >>> window
-Window(@... ...:test, Session($...))
+Window(@2 2:test, Session($1 ...))
 >>> pane = window.split_window(attach=False)
 >>> pane
-Pane(%... Window(@... ...:..., Session($... libtmux_...)))
+Pane(%5 Window(@2 2:test, Session($1 ...)))
 ```
 
 Type inside the pane (send key strokes):
@@ -175,9 +175,9 @@ Traverse and navigate:
 
 ```python
 >>> pane.window
-Window(@... ...:..., Session($... ...))
+Window(@1 1:..., Session($1 ...))
 >>> pane.window.session
-Session($... ...)
+Session($1 ...)
 ```
 
 # Python support

Diff for: docs/conf.py

@@ -160,7 +160,10 @@
     )
 ]
 
-intersphinx_mapping = {"http://docs.python.org/": None}
+intersphinx_mapping = {
+    "": ("https://docs.python.org/", None),
+    "pytest": ("https://docs.pytest.org/en/stable/", None),
+}
 
 
 def linkcode_resolve(

Diff for: docs/conftest.py

@@ -0,0 +1 @@
+from libtmux.conftest import *  # NOQA: F4

Diff for: docs/developing.md

@@ -23,6 +23,14 @@ Makefile commands prefixed with `watch_` will watch files and rerun.
 Helpers: `make test`
 Rerun tests on file change: `make watch_test` (requires [entr(1)])
 
+### Pytest plugin
+
+:::{seealso}
+
+See {ref}`pytest_plugin`.
+
+:::
+
 ## Documentation
 
 Default preview server: http://localhost:8023

Diff for: docs/index.md

@@ -28,6 +28,7 @@ api
 :hidden:
 
 developing
+pytest-plugin
 internals/index
 history
 glossary

Diff for: docs/pytest-plugin.md

@@ -0,0 +1,98 @@
+(pytest_plugin)=
+
+# `pytest` plugin
+
+Testing tmux with libtmux
+
+```{seealso} Using libtmux?
+
+Do you want more flexbility? Correctness? Power? Defaults changed? [Connect with us] on the tracker, we want to know
+your case, we won't stabilize APIs until we're sure everything is by the book.
+
+[connect with us]: https://github.com/tmux-python/libtmux/discussions
+
+```
+
+```{module} libtmux.pytest_plugin
+
+```
+
+## Usage
+
+Install `libtmux` via the python package manager of your choosing, e.g.
+
+```console
+$ pip install libtmux
+```
+
+The pytest plugin will automatically be detected via pytest, and the fixtures will be added.
+
+## Fixtures
+
+`pytest-tmux` works through providing {ref}`pytest fixtures <pytest:fixtures-api>` - so read up on
+those!
+
+The plugin's fixtures guarantee a fresh, headless `tmux(1)` server, session, window, or pane is
+passed into your test.
+
+(recommended-fixtures)=
+
+## Recommended fixtures
+
+These are fixtures are automatically used when the plugin is enabled and `pytest` is ran.
+
+- Creating temporary, test directories for:
+  - `/home/` ({func}`home_path`)
+  - `/home/${user}` ({func}`user_path`)
+- Default `.tmux.conf` configuration with these settings ({func}`config_file`):
+
+  - `base-index -g 1`
+
+  These are set to ensure panes and windows can be reliably referenced and asserted.
+
+## Setting a tmux configuration
+
+If you would like :func:`session` fixture to automatically use a configuration, you have a few
+options:
+
+- Pass a `config_file` into :class:`libtmux.server.Server`
+- Set the `HOME` directory to a local or temporary pytest path with a configurat configuration file
+
+You could also read the code and override :func:`server`'s fixture in your own doctest. doctest.
+
+(set_home)=
+
+### Setting a temporary home directory
+
+```python
+import pathlib
+import pytest
+
+@pytest.fixture(autouse=True, scope="function")
+def set_home(
+    monkeypatch: pytest.MonkeyPatch,
+    user_path: pathlib.Path,
+):
+    monkeypatch.setenv("HOME", str(user_path))
+```
+
+## See examples
+
+View libtmux's own [tests/](https://github.com/tmux-python/libtmux/tree/master/tests) as well as
+tmuxp's [tests/](https://github.com/tmux-python/tmuxp/tree/master/tests).
+
+libtmux's tests `autouse` the {ref}`recommended-fixtures` above to ensure stable, assertions and
+object lookups in the test grid.
+
+## API reference
+
+```{eval-rst}
+.. autoapimodule:: libtmux.pytest_plugin
+    :members:
+    :inherited-members:
+    :private-members:
+    :show-inheritance:
+    :member-order: bysource
+    :exclude-members: Server, TEST_SESSION_PREFIX, get_test_session_name,
+        namer, logger
+```

Diff for: docs/quickstart.md

@@ -139,15 +139,15 @@ We can list sessions with {meth}`Server.list_sessions`:
 
 ```python
 >>> server.list_sessions()
-[Session($... ...), Session($... ...)]
+[Session($1 ...), Session($0 ...)]
 ```
 
 This returns a list of {class}`Session` objects you can grab. We can
 find our current session with:
 
 ```python
 >>> server.list_sessions()[0]
-Session($... ...)
+Session($1 ...)
 ```
 
 However, this isn't guaranteed, libtmux works against current tmux information, the
@@ -162,7 +162,7 @@ tmux sessions use the `$[0-9]` convention as a way to identify sessions.
 
 ```python
 >>> server.get_by_id('$1')
-Session($... ...)
+Session($1 ...)
 ```
 
 You may `session = server.get_by_id('$<yourId>')` to use the session object.
@@ -172,10 +172,10 @@ You may `session = server.get_by_id('$<yourId>')` to use the session object.
 ```python
 # Just for setting up the example:
 >>> server.sessions[0].rename_session('foo')
-Session($... foo)
+Session($1 foo)
 
 >>> server.find_where({ "session_name": "foo" })
-Session($... foo)
+Session($1 foo)
 ```
 
 With `find_where`, pass in a dict and return the first object found. In
@@ -188,11 +188,11 @@ So you may now use:
 ```python
 # Prepping the example:
 >>> server.sessions[0].rename_session('foo')
-Session($... foo)
+Session($1 foo)
 
 >>> session = server.find_where({ "session_name": "foo" })
 >>> session
-Session($... foo)
+Session($1 foo)
 ```
 
 to give us a `session` object to play with.
@@ -206,7 +206,7 @@ Let's make a {meth}`Session.new_window`, in the background:
 
 ```python
 >>> session.new_window(attach=False, window_name="ha in the bg")
-Window(@... ...:ha in the bg, Session($... ...))
+Window(@2 ...:ha in the bg, Session($1 ...))
 ```
 
 So a few things:
@@ -245,15 +245,15 @@ should have history, so navigate up with the arrow key.
 
 ```python
 >>> session.new_window(attach=False, window_name="ha in the bg")
-Window(@... ...:ha in the bg, Session($... ...))
+Window(@2 ...:ha in the bg, Session($1 ...))
 ```
 
 Try to kill the window by the matching id `@[0-9999]`.
 
 ```python
 # Setup
 >>> session.new_window(attach=False, window_name="ha in the bg")
-Window(@... ...:ha in the bg, Session($... ...))
+Window(@1 ...:ha in the bg, Session($1 ...))
 
 >>> session.kill_window('ha in the bg')
 ```
@@ -264,7 +264,7 @@ object:
 ```python
 >>> window = session.new_window(attach=False, window_name="check this out")
 >>> window
-Window(@... ...:check this out, Session($... ...))
+Window(@2 2:check this out, Session($1 ...))
 ```
 
 And kill:
@@ -291,7 +291,7 @@ Let's create a pane, {meth}`Window.split_window`:
 
 ```python
 >>> window.split_window(attach=False)
-Pane(%... Window(@... ...:..., Session($... ...)))
+Pane(%2 Window(@1 ...:..., Session($1 ...)))
 ```
 
 Powered up. Let's have a break down:
@@ -304,7 +304,7 @@ Also, since you are aware of this power, let's commemorate the experience:
 
 ```python
 >>> window.rename_window('libtmuxower')
-Window(@... ...:..., Session($... ...))
+Window(@1 ...:..., Session($1 ...))
 ```
 
 You should have noticed {meth}`Window.rename_window` renamed the window.
@@ -329,7 +329,7 @@ can also use the `.select_*` available on the object, in this case the pane has
 
 ```python
 >>> pane.select_pane()
-Pane(%... Window(@... ...:..., Session($... ...)))
+Pane(%1 Window(@1 ...:..., Session($1 ...)))
 ```
 
 ```{eval-rst}