Create tests: dumps message, "retry" (#281)

e2e-tests/retry.spec.ts

@@ -0,0 +1,13 @@
+import { test } from "./helpers/test_helper";
+
+test("retry - should work", async ({ po }) => {
+  await po.setUp();
+  await po.sendPrompt("[increment]");
+  await po.snapshotMessages();
+
+  await po.dismissAllToasts();
+  await po.clickRetry();
+  await po.expectNoToast();
+  // The counter should be incremented in the snapshotted messages.
+  await po.snapshotMessages();
+});