test_dominator_trees_05.js

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/* Any copyright is dedicated to the Public Domain.

   http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

// Test that changing the currently selected snapshot to a snapshot that does

// not have a dominator tree will automatically compute and fetch one for it.

const {

  dominatorTreeState,

  viewState,

  treeMapState,

} = require("resource://devtools/client/memory/constants.js");

const {

  takeSnapshotAndCensus,

  selectSnapshotAndRefresh,

} = require("resource://devtools/client/memory/actions/snapshot.js");

const {

  changeView,

} = require("resource://devtools/client/memory/actions/view.js");

add_task(async function () {

  const front = new StubbedMemoryFront();

  const heapWorker = new HeapAnalysesClient();

  await front.attach();

  const store = Store();

  const { getState, dispatch } = store;

  dispatch(takeSnapshotAndCensus(front, heapWorker));

  dispatch(takeSnapshotAndCensus(front, heapWorker));

  await waitUntilCensusState(store, s => s.treeMap, [

    treeMapState.SAVED,

    treeMapState.SAVED,

]);

  ok(getState().snapshots[1].selected, "The second snapshot is selected");

  // Change to the dominator tree view.

  dispatch(changeView(viewState.DOMINATOR_TREE));

  // Wait for the dominator tree to finish being fetched.

  await waitUntilState(

    store,

    state =>

      state.snapshots[1].dominatorTree &&

      state.snapshots[1].dominatorTree.state === dominatorTreeState.LOADED

);

  ok(true, "The second snapshot's dominator tree was fetched");

  // Select the first snapshot.

  dispatch(selectSnapshotAndRefresh(heapWorker, getState().snapshots[0].id));

  // And now the first snapshot should have its dominator tree fetched and

  // computed because of the new selection.

  await waitUntilState(

    store,

    state =>

      state.snapshots[0].dominatorTree &&

      state.snapshots[0].dominatorTree.state === dominatorTreeState.LOADED

);

  ok(true, "The first snapshot's dominator tree was fetched");

  heapWorker.destroy();

  await front.detach();

});