diff --git a/packages/shared/src/__tests__/browser.test.ts b/packages/shared/src/__tests__/browser.test.ts
index 5a801e7d9b..1c34776789 100644
--- a/packages/shared/src/__tests__/browser.test.ts
+++ b/packages/shared/src/__tests__/browser.test.ts
@@ -1,9 +1,66 @@
-import { inBrowser, isValidBrowserOnline, userAgentIsRobot } from '../browser';
+import { inBrowser, isValidBrowser, isValidBrowserOnline, userAgentIsRobot } from '../browser';
 
 describe('inBrowser()', () => {
+  afterEach(() => {
+    jest.restoreAllMocks();
+  });
+
   it('returns true if window is defined', () => {
     expect(inBrowser()).toBe(true);
   });
+  it('returns false if window is undefined', () => {
+    const windowSpy = jest.spyOn(global, 'window', 'get');
+    // @ts-ignore - Test
+    windowSpy.mockReturnValue(undefined);
+    expect(inBrowser()).toBe(false);
+  });
+});
+
+describe('isValidBrowser', () => {
+  let userAgentGetter: any;
+  let webdriverGetter: any;
+
+  beforeEach(() => {
+    userAgentGetter = jest.spyOn(window.navigator, 'userAgent', 'get');
+    webdriverGetter = jest.spyOn(window.navigator, 'webdriver', 'get');
+  });
+
+  afterEach(() => {
+    jest.restoreAllMocks();
+  });
+
+  it('returns false if not in browser', () => {
+    const windowSpy = jest.spyOn(global, 'window', 'get');
+    // @ts-ignore - Test
+    windowSpy.mockReturnValue(undefined);
+
+    expect(isValidBrowser()).toBe(false);
+  });
+
+  it('returns true if in browser, navigator is not a bot, and webdriver is not enabled', () => {
+    userAgentGetter.mockReturnValue(
+      'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/109.0',
+    );
+    webdriverGetter.mockReturnValue(false);
+
+    expect(isValidBrowser()).toBe(true);
+  });
+
+  it('returns false if navigator is a bot', () => {
+    userAgentGetter.mockReturnValue('msnbot-NewsBlogs/2.0b (+http://search.msn.com/msnbot.htm)');
+    webdriverGetter.mockReturnValue(false);
+
+    expect(isValidBrowser()).toBe(false);
+  });
+
+  it('returns false if webdriver is enabled', () => {
+    userAgentGetter.mockReturnValue(
+      'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/109.0',
+    );
+    webdriverGetter.mockReturnValue(true);
+
+    expect(isValidBrowser()).toBe(false);
+  });
 });
 
 describe('detectUserAgentRobot', () => {
diff --git a/packages/shared/src/__tests__/url.test.ts b/packages/shared/src/__tests__/url.test.ts
index 6410f67c83..7a5f8ce4ef 100644
--- a/packages/shared/src/__tests__/url.test.ts
+++ b/packages/shared/src/__tests__/url.test.ts
@@ -1,4 +1,4 @@
-import { addClerkPrefix, parseSearchParams, stripScheme } from '../url';
+import { addClerkPrefix, getClerkJsMajorVersionOrTag, getScriptUrl, parseSearchParams, stripScheme } from '../url';
 
 describe('parseSearchParams(queryString)', () => {
   it('parses query string and returns a URLSearchParams object', () => {
@@ -56,3 +56,59 @@ describe('addClerkPrefix(str)', () => {
     expect(addClerkPrefix(urlInput)).toBe(urlOutput);
   });
 });
+
+describe('getClerkJsMajorVersionOrTag', () => {
+  const stagingFrontendApi = 'foobar.lclstage.dev';
+
+  it('returns staging if pkgVersion is not provided and frontendApi is staging', () => {
+    expect(getClerkJsMajorVersionOrTag(stagingFrontendApi)).toBe('staging');
+  });
+
+  it('returns latest if pkgVersion is not provided and frontendApi is not staging', () => {
+    expect(getClerkJsMajorVersionOrTag('foobar.dev')).toBe('latest');
+  });
+
+  it('returns next if pkgVersion contains next', () => {
+    expect(getClerkJsMajorVersionOrTag('foobar.dev', '1.2.3-next.4')).toBe('next');
+  });
+
+  it('returns the major version if pkgVersion is provided', () => {
+    expect(getClerkJsMajorVersionOrTag('foobar.dev', '1.2.3')).toBe('1');
+  });
+
+  it('returns latest if pkgVersion is empty string', () => {
+    expect(getClerkJsMajorVersionOrTag('foobar.dev', '')).toBe('latest');
+  });
+});
+
+describe('getScriptUrl', () => {
+  const frontendApi = 'https://foobar.dev';
+
+  it('returns URL using the clerkJSVersion if provided', () => {
+    expect(getScriptUrl(frontendApi, { clerkJSVersion: '1.2.3' })).toBe(
+      'https://foobar.dev/npm/@clerk/clerk-js@1.2.3/dist/clerk.browser.js',
+    );
+  });
+
+  it('returns URL using the latest version if clerkJSVersion & pkgVersion is not provided + frontendApi is not staging', () => {
+    expect(getScriptUrl(frontendApi, {})).toBe('https://foobar.dev/npm/@clerk/clerk-js@latest/dist/clerk.browser.js');
+  });
+
+  it('returns URL using the major version if only pkgVersion is provided', () => {
+    expect(getScriptUrl(frontendApi, { pkgVersion: '1.2.3' })).toBe(
+      'https://foobar.dev/npm/@clerk/clerk-js@1/dist/clerk.browser.js',
+    );
+  });
+
+  it('returns URL using the major version if only pkgVersion contains next', () => {
+    expect(getScriptUrl(frontendApi, { pkgVersion: '1.2.3-next.4' })).toBe(
+      'https://foobar.dev/npm/@clerk/clerk-js@next/dist/clerk.browser.js',
+    );
+  });
+
+  it('returns URL using the staging tag if frontendApi is staging', () => {
+    expect(getScriptUrl('https://foobar.lclstage.dev', {})).toBe(
+      'https://foobar.lclstage.dev/npm/@clerk/clerk-js@staging/dist/clerk.browser.js',
+    );
+  });
+});