chore(mypy): Add typing for plugin tests

Author: tony

tests/fixtures/pluginsystem/partials/_types.py

@@ -0,0 +1,34 @@
+"""Internal, :const:`typing.TYPE_CHECKING` guarded :term:`type annotations <annotation>`
+
+These are _not_ to be imported at runtime as `typing_extensions` is not
+bundled with tmuxp. Usage example:
+
+>>> import typing as t
+
+>>> if t.TYPE_CHECKING:
+...     from tmuxp.fixtures.pluginsystem.partials._types import PluginConfigSchema
+...
+"""
+import typing as t
+
+from typing_extensions import NotRequired, TypedDict
+
+
+class PluginTestConfigSchema(TypedDict):
+    """Same as PluginConfigSchema, but with tmux, libtmux, and tmuxp version"""
+
+    tmux_version: NotRequired[str]
+    libtmux_version: NotRequired[str]
+    tmuxp_version: NotRequired[str]
+
+    # Normal keys
+    plugin_name: NotRequired[str]
+    tmux_min_version: NotRequired[str]
+    tmux_max_version: NotRequired[str]
+    tmux_version_incompatible: NotRequired[t.List[str]]
+    libtmux_min_version: NotRequired[str]
+    libtmux_max_version: NotRequired[str]
+    libtmux_version_incompatible: NotRequired[t.List[str]]
+    tmuxp_min_version: NotRequired[str]
+    tmuxp_max_version: NotRequired[str]
+    tmuxp_version_incompatible: NotRequired[t.List[str]]