session

Test session: immutable state wrapper for the Elm loop.

A TestSession holds the current model, normalized tree, and app reference. Each operation (send_event, click, etc.) returns a new session with updated state. No processes, no side effects – pure functional state threading.

Types

TestSession

opaque </>

Immutable test session. Each operation returns a new session.

pub opaque type TestSession(model, msg)

Values

current_tree

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pub fn current_tree(
  session: TestSession(model, msg),
) -> node.Node

Return the current normalized tree.

get_app

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pub fn get_app(
  session: TestSession(model, msg),
) -> app.App(model, msg)

Return the underlying app (for helpers that need access).

model

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pub fn model(session: TestSession(model, msg)) -> model

Return the current model.

send_event

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pub fn send_event(
  session: TestSession(model, msg),
  event: msg,
) -> TestSession(model, msg)

Dispatch an event through the app’s update function. Processes resulting commands and re-renders the view.

start

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pub fn start(app: app.App(model, msg)) -> TestSession(model, msg)

Create a new test session from an app. Calls init, processes commands, renders and normalizes the initial view.