1 files changed, 55 insertions, 0 deletions
diff --git a/src/prompt_toolkit/application/dummy.py b/src/prompt_toolkit/application/dummy.py
new file mode 100644
index 0000000..43819e1
--- /dev/null
+++ b/src/prompt_toolkit/application/dummy.py
@@ -0,0 +1,55 @@
+from __future__ import annotations
+
+from typing import Callable
+
+from prompt_toolkit.eventloop import InputHook
+from prompt_toolkit.formatted_text import AnyFormattedText
+from prompt_toolkit.input import DummyInput
+from prompt_toolkit.output import DummyOutput
+
+from .application import Application
+
+__all__ = [
+    "DummyApplication",
+]
+
+
+class DummyApplication(Application[None]):
+    """
+    When no :class:`.Application` is running,
+    :func:`.get_app` will run an instance of this :class:`.DummyApplication` instead.
+    """
+
+    def __init__(self) -> None:
+        super().__init__(output=DummyOutput(), input=DummyInput())
+
+    def run(
+        self,
+        pre_run: Callable[[], None] | None = None,
+        set_exception_handler: bool = True,
+        handle_sigint: bool = True,
+        in_thread: bool = False,
+        inputhook: InputHook | None = None,
+    ) -> None:
+        raise NotImplementedError("A DummyApplication is not supposed to run.")
+
+    async def run_async(
+        self,
+        pre_run: Callable[[], None] | None = None,
+        set_exception_handler: bool = True,
+        handle_sigint: bool = True,
+        slow_callback_duration: float = 0.5,
+    ) -> None:
+        raise NotImplementedError("A DummyApplication is not supposed to run.")
+
+    async def run_system_command(
+        self,
+        command: str,
+        wait_for_enter: bool = True,
+        display_before_text: AnyFormattedText = "",
+        wait_text: str = "",
+    ) -> None:
+        raise NotImplementedError
+
+    def suspend_to_background(self, suspend_group: bool = True) -> None:
+        raise NotImplementedError