Add some tests for the monthly activity email

src/emails/templates/monthlyActivity/MonthlyActivityEmail.test.tsx

@@ -0,0 +1,46 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import { it, expect } from "@jest/globals";
+import { composeStory } from "@storybook/react";
+import { render, screen } from "@testing-library/react";
+import Meta, {
+  MonthlyActivityEmailFreeStory,
+  MonthlyActivityEmailPlusWithManualStory,
+  MonthlyActivityEmailPlusWithoutManualStory,
+} from "./MonthlyActivityEmail.stories";
+
+it("has an upgrade banner for free users", () => {
+  const ComposedEmail = composeStory(MonthlyActivityEmailFreeStory, Meta);
+  render(<ComposedEmail />);
+
+  const banner = screen.getByText("Upgrade for extra protection");
+  expect(banner).toBeInTheDocument();
+});
+
+it("does not imply we did everything when a user has fixed exposures/breaches themselves", () => {
+  const ComposedEmail = composeStory(
+    MonthlyActivityEmailPlusWithManualStory,
+    Meta,
+  );
+  render(<ComposedEmail />);
+
+  const whatWeFixedInHeroText = screen.queryByText(
+    "Here’s how we’ve protected you.",
+  );
+  const whatWeFixedInLeadText = screen.queryByText("Here’s what we fixed:");
+  expect(whatWeFixedInHeroText).not.toBeInTheDocument();
+  expect(whatWeFixedInLeadText).not.toBeInTheDocument();
+});
+
+it("emphasises that things have happened while someone was subscribed to Plus and didn't do anything themselves", () => {
+  const ComposedEmail = composeStory(
+    MonthlyActivityEmailPlusWithoutManualStory,
+    Meta,
+  );
+  render(<ComposedEmail />);
+
+  const dashboardLink = screen.getByRole("link", { name: "View all activity" });
+  expect(dashboardLink).toBeInTheDocument();
+});