test: add unit tests for getClientConfig

test/get-client-config.test.ts

@@ -0,0 +1,24 @@
+import { getClientConfig } from "../app/config/client";
+
+describe("getClientConfig", () => {
+  afterEach(() => {
+    document.head
+      .querySelectorAll("meta[name='config']")
+      .forEach((m) => m.remove());
+  });
+
+  test("returns an empty object when no config meta tag is present", () => {
+    expect(getClientConfig()).toEqual({});
+  });
+
+  test("parses the config meta tag content on the client", () => {
+    const meta = document.createElement("meta");
+    meta.name = "config";
+    meta.content = JSON.stringify({ buildMode: "standalone", isApp: true });
+    document.head.appendChild(meta);
+    expect(getClientConfig()).toMatchObject({
+      buildMode: "standalone",
+      isApp: true,
+    });
+  });
+});