1 files changed, 46 insertions, 0 deletions
diff --git a/devtools/client/memory/test/xpcshell/test_action-select-snapshot.js b/devtools/client/memory/test/xpcshell/test_action-select-snapshot.js
new file mode 100644
index 0000000000..29f69839a0
--- /dev/null
+++ b/devtools/client/memory/test/xpcshell/test_action-select-snapshot.js
@@ -0,0 +1,46 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests the reducer responding to the action `selectSnapshot(snapshot)`
+ */
+
+const actions = require("resource://devtools/client/memory/actions/snapshot.js");
+const {
+  snapshotState: states,
+} = require("resource://devtools/client/memory/constants.js");
+
+add_task(async function() {
+  const front = new StubbedMemoryFront();
+  await front.attach();
+  const store = Store();
+
+  for (let i = 0; i < 5; i++) {
+    store.dispatch(actions.takeSnapshot(front));
+  }
+
+  await waitUntilState(
+    store,
+    ({ snapshots }) => snapshots.length === 5 && snapshots.every(isDone)
+  );
+
+  for (let i = 0; i < 5; i++) {
+    info(`Selecting snapshot[${i}]`);
+    store.dispatch(actions.selectSnapshot(store.getState().snapshots[i].id));
+    await waitUntilState(store, ({ snapshots }) => snapshots[i].selected);
+
+    const { snapshots } = store.getState();
+    ok(snapshots[i].selected, `snapshot[${i}] selected`);
+    equal(
+      snapshots.filter(s => !s.selected).length,
+      4,
+      "All other snapshots are unselected"
+    );
+  }
+});
+
+function isDone(s) {
+  return s.state === states.SAVED;
+}