test(isUrl): covered isUrl utility with unit tests

src/test/utils/isUrl.spec.ts

@@ -0,0 +1,39 @@
+import { isUrl } from '../../utils/isUrl'
+
+describe('urlValidator', () => {
+  it('should return true with an HTTP URL', () => {
+    const url = 'http://google.com'
+
+    expect(isUrl(url)).toEqual(true)
+  })
+
+  it('should return true with an HTTPS URL', () => {
+    const url = 'https://google.com'
+
+    expect(isUrl(url)).toEqual(true)
+  })
+
+  it('should return true when the URL is blank', () => {
+    const url = ''
+
+    expect(isUrl(url)).toEqual(false)
+  })
+
+  it('should return false when the URL has not supported protocol', () => {
+    const url = 'htpps://google.com'
+
+    expect(isUrl(url)).toEqual(false)
+  })
+
+  it('should return false when the URL is null', () => {
+    const url = null
+
+    expect(isUrl((url as unknown) as string)).toEqual(false)
+  })
+
+  it('should return false when the URL is undefined', () => {
+    const url = undefined
+
+    expect(isUrl((url as unknown) as string)).toEqual(false)
+  })
+})

src/utils/isUrl.ts

@@ -1,10 +1,14 @@
 /**
  * Checks if string is in URL format.
- * @param url - string to check.
+ * @param str - string to check.
  */
-export const isUrl = (url: string): boolean => {
+export const isUrl = (str: string): boolean => {
+  const supportedProtocols = ['http:', 'https:']
+
   try {
-    const validUrl = new URL(url)
+    const url = new URL(str)
+
+    if (!supportedProtocols.includes(url.protocol)) return false
   } catch (_) {
     return false
   }