fix: Snippet path in preview (calcom#14830)

* fix: Snippet path in preview

* Add test

packages/embeds/embed-core/playwright/tests/preview.e2e.ts

@@ -3,7 +3,7 @@ import { expect } from "@playwright/test";
 import { test } from "@calcom/web/playwright/lib/fixtures";
 
 test.describe("Preview", () => {
-  test("Preview - embed-core should load", async ({ page }) => {
+  test("Preview - embed-core should load if correct embedLibUrl is provided", async ({ page }) => {
     await page.goto(
       "http://localhost:3000/embed/preview.html?embedLibUrl=http://localhost:3000/embed/embed.js&bookerUrl=http://localhost:3000&calLink=pro/30min"
     );
@@ -26,4 +26,20 @@ test.describe("Preview", () => {
     });
     expect(libraryLoaded).toBe(true);
   });
+
+  test("Preview - embed-core should load from embedLibUrl", async ({ page }) => {
+    // Intentionally pass a URL that will not load to be able to easily test that the embed was loaded from there
+    page.goto(
+      "http://localhost:3000/embed/preview.html?embedLibUrl=http://wronglocalhost:3000/embed/embed.js&bookerUrl=http://localhost:3000&calLink=pro/30min"
+    );
+
+    const failedRequestUrl = await new Promise<string>((resolve) =>
+      page.on("requestfailed", (request) => {
+        console.log("request failed");
+        resolve(request.url());
+      })
+    );
+
+    expect(failedRequestUrl).toBe("http://wronglocalhost:3000/embed/embed.js");
+  });
 });

packages/embeds/embed-core/src/preview.ts

@@ -47,7 +47,7 @@ if (!bookerUrl || !embedLibUrl) {
       }
       p(cal, ar);
     };
-})(window, "//localhost:3000/embed/embed.js", "init");
+})(window, embedLibUrl, "init");
 const previewWindow = window;
 previewWindow.Cal.fingerprint = process.env.EMBED_PUBLIC_EMBED_FINGER_PRINT as string;