From fb0d92d38839e038047d5520b4ad5684d9df463a Mon Sep 17 00:00:00 2001
From: Minsu <52266597+Gaic4o@users.noreply.github.com>
Date: Fri, 22 Mar 2024 17:25:27 +0900
Subject: [PATCH] test(@toss/utils): Add new test for loadScript (#432)

---
 packages/common/utils/src/loadScript.spec.ts | 26 ++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 packages/common/utils/src/loadScript.spec.ts

diff --git a/packages/common/utils/src/loadScript.spec.ts b/packages/common/utils/src/loadScript.spec.ts
new file mode 100644
index 000000000..00324f52b
--- /dev/null
+++ b/packages/common/utils/src/loadScript.spec.ts
@@ -0,0 +1,26 @@
+import * as deviceModule from './device/isServer';
+import { loadScript } from './loadScript';
+
+describe('loadScript', () => {
+  it('should immediately resolve with a Promise in a server environment', async () => {
+    jest.spyOn(deviceModule, 'isServer').mockReturnValue(true);
+    await expect(loadScript('test-script.js')).resolves.toBeUndefined();
+  });
+
+  it('should immediately resolve with a Promise if the script is already loaded or loading', async () => {
+    jest.spyOn(deviceModule, 'isServer').mockReturnValue(false);
+    const script = document.createElement('script');
+    script.src = 'test-script.js';
+    document.body.appendChild(script);
+    await expect(loadScript('test-script.js')).resolves.toBeUndefined();
+  });
+
+  it('should append a script element to the document body and resolve the Promise on load event', () => {
+    jest.spyOn(deviceModule, 'isServer').mockReturnValue(false);
+    const source = 'https://example.com/script.js';
+    loadScript(source);
+
+    const scriptElement = document.querySelector(`script[src="${source}"]`);
+    expect(scriptElement).toBeTruthy();
+  });
+});