diff --git a/src/utils/url.test.ts b/src/utils/url.test.ts
new file mode 100644
index 0000000..33b99b1
--- /dev/null
+++ b/src/utils/url.test.ts
@@ -0,0 +1,27 @@
+import { isURL, isEmail, getRegistryURL } from './url';
+
+describe('url', () => {
+  test('isURL() - should return true for localhost', () => {
+    expect(isURL('http://localhost:8080/bootstrap/-/bootstrap-4.3.1.tgz')).toBeTruthy();
+  });
+
+  test('isURL() - should return false when protocol is missing', () => {
+    expect(isURL('localhost:8080/bootstrap/-/bootstrap-4.3.1.tgz')).toBeFalsy();
+  });
+
+  test('isEmail() - should return true if valid', () => {
+    expect(isEmail('email@domain.com')).toBeTruthy();
+  });
+  test('isEmail() - should return false if invalid', () => {
+    expect(isEmail('')).toBeFalsy();
+  });
+
+  test('getRegistryURL() - should keep slash if location is a sub directory', () => {
+    history.pushState({}, 'page title', '/-/web/detail');
+    expect(getRegistryURL()).toBe('http://localhost/-/web/detail');
+    history.pushState({}, 'page title', '/');
+  });
+  test('getRegistryURL() - should not add slash if location is not a sub directory', () => {
+    expect(getRegistryURL()).toBe('http://localhost');
+  });
+});