1 files changed, 59 insertions, 0 deletions
diff --git a/devtools/client/memory/test/unit/test_dominator_trees_05.js b/devtools/client/memory/test/unit/test_dominator_trees_05.js
new file mode 100644
index 000000000..42ea13e18
--- /dev/null
+++ b/devtools/client/memory/test/unit/test_dominator_trees_05.js
@@ -0,0 +1,59 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// 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.
+
+let {
+  snapshotState: states,
+  dominatorTreeState,
+  viewState,
+  treeMapState,
+} = require("devtools/client/memory/constants");
+let {
+  takeSnapshotAndCensus,
+  selectSnapshotAndRefresh,
+} = require("devtools/client/memory/actions/snapshot");
+
+let { changeView } = require("devtools/client/memory/actions/view");
+
+function run_test() {
+  run_next_test();
+}
+
+add_task(function* () {
+  let front = new StubbedMemoryFront();
+  let heapWorker = new HeapAnalysesClient();
+  yield front.attach();
+  let store = Store();
+  let { getState, dispatch } = store;
+
+  dispatch(takeSnapshotAndCensus(front, heapWorker));
+  dispatch(takeSnapshotAndCensus(front, heapWorker));
+  yield 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.
+  yield 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.
+  yield 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();
+  yield front.detach();
+});