1 files changed, 69 insertions, 0 deletions
diff --git a/devtools/client/memory/test/unit/test_dominator_trees_04.js b/devtools/client/memory/test/unit/test_dominator_trees_04.js
new file mode 100644
index 000000000..ba375c354
--- /dev/null
+++ b/devtools/client/memory/test/unit/test_dominator_trees_04.js
@@ -0,0 +1,69 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test that selecting the dominator tree view while in the middle of taking a
+// snapshot properly kicks off fetching and computing dominator trees.
+
+const {
+  snapshotState: states,
+  dominatorTreeState,
+  viewState,
+} = require("devtools/client/memory/constants");
+const {
+  takeSnapshotAndCensus,
+} = require("devtools/client/memory/actions/snapshot");
+const {
+  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();
+
+  for (let intermediateSnapshotState of [states.SAVING,
+                                         states.READING,
+                                         states.READ]) {
+    dumpn(`Testing switching to the DOMINATOR_TREE view in the middle of the ${intermediateSnapshotState} snapshot state`);
+
+    let store = Store();
+    let { getState, dispatch } = store;
+
+    dispatch(takeSnapshotAndCensus(front, heapWorker));
+    yield waitUntilSnapshotState(store, [intermediateSnapshotState]);
+
+    dispatch(changeView(viewState.DOMINATOR_TREE));
+    equal(getState().view.state, viewState.DOMINATOR_TREE,
+          "We should now be in the DOMINATOR_TREE view");
+
+    // Wait for the dominator tree to start being computed.
+    yield waitUntilState(store, state =>
+      state.snapshots[0] && state.snapshots[0].dominatorTree);
+    equal(getState().snapshots[0].dominatorTree.state,
+          dominatorTreeState.COMPUTING,
+          "The dominator tree started computing");
+    ok(!getState().snapshots[0].dominatorTree.root,
+       "When the dominator tree is computing, we should not have its root");
+
+    // Wait for the dominator tree to finish computing and start being fetched.
+    yield waitUntilState(store, state =>
+      state.snapshots[0].dominatorTree.state === dominatorTreeState.FETCHING);
+    ok(true, "The dominator tree started fetching");
+    ok(!getState().snapshots[0].dominatorTree.root,
+       "When the dominator tree is fetching, we should not have its root");
+
+    // Wait for the dominator tree to finish being fetched.
+    yield waitUntilState(store, state =>
+      state.snapshots[0].dominatorTree.state === dominatorTreeState.LOADED);
+    ok(true, "The dominator tree was fetched");
+    ok(getState().snapshots[0].dominatorTree.root,
+       "When the dominator tree is loaded, we should have its root");
+  }
+
+  heapWorker.destroy();
+  yield front.detach();
+});