adds tests for isValid url validation method

lib/quill/link.js

@@ -91,3 +91,4 @@ SafeLink.tagName = 'A';
 
 
 export { SafeLink as default };
+export { isValid };

lib/quill/link.test.js

@@ -0,0 +1,49 @@
+import { isValid } from './link';
+
+describe('SafeLink', () => {
+  describe('isValid', () => {
+    test('allows anchor links', () => {
+      expect(isValid('#anchor-link')).toEqual(true);
+    });
+
+    test('allows links relative to the site root', () => {
+      expect(isValid('/section')).toEqual(true);
+    });
+
+    test('allows mailto links', () => {
+      expect(isValid('mailto:[email protected]')).toEqual(true);
+    });
+
+    test('allows ftp links', () => {
+      expect(isValid('ftp://example.com/file')).toEqual(true);
+    });
+
+    test('allows http links', () => {
+      expect(isValid('http://example.com/foo')).toEqual(true);
+    });
+
+    test('allows https links', () => {
+      expect(isValid('https://example.com/foo')).toEqual(true);
+    });
+
+    test('allows links without path', () => {
+      expect(isValid('https://example.com')).toEqual(true);
+    });
+
+    test('rejects anchor links with spaces', () => {
+      expect(isValid('#anchor link')).toEqual(false);
+    });
+
+    test('rejects links relative to current page', () => {
+      expect(isValid('section')).toEqual(false);
+    });
+
+    test('rejects mailto links without @', () => {
+      expect(isValid('mailto:example')).toEqual(false);
+    });
+
+    test('rejects links without a protocol', () => {
+      expect(isValid('example.com/foo')).toEqual(false);
+    });
+  });
+});