Tests (#2499)

* Setup jest framework for unit tests

* Move tests to a separate package

* Remove test script

tests/sample.test.js

@@ -0,0 +1,10 @@
+describe('sample', () => {
+    beforeAll(async () => {
+        await page.goto(global.ST_URL);
+        await page.waitForFunction('document.getElementById("preloader") === null', { timeout: 0 });
+    });
+
+    it('should be titled "SillyTavern"', async () => {
+        await expect(page.title()).resolves.toMatch('SillyTavern');
+    });
+});