diff --git a/Libraries/Blob/__tests__/URL-test.js b/Libraries/Blob/__tests__/URL-test.js
index 281649ce7821d7..440f09bc0dbb8f 100644
--- a/Libraries/Blob/__tests__/URL-test.js
+++ b/Libraries/Blob/__tests__/URL-test.js
@@ -23,15 +23,55 @@ describe('URL', function() {
     expect(d.href).toBe('https://developer.mozilla.org/en-US/docs');
     const f = new URL('/en-US/docs', d);
     expect(f.href).toBe('https://developer.mozilla.org/en-US/docs');
-    // from original test suite, but requires complex implementation
-    // const g = new URL(
-    //   '/en-US/docs',
-    //   'https://developer.mozilla.org/fr-FR/toto',
-    // );
-    // expect(g.href).toBe('https://developer.mozilla.org/en-US/docs');
+    const g = new URL(
+      '/en-US/docs',
+      'https://developer.mozilla.org/fr-FR/toto',
+    );
+    expect(g.href).toBe('https://developer.mozilla.org/en-US/docs');
     const h = new URL('/en-US/docs', a);
     expect(h.href).toBe('https://developer.mozilla.org/en-US/docs');
     const i = new URL('http://github.com', 'http://google.com');
     expect(i.href).toBe('http://github.com/');
   });
+
+  it('should pass WHATWG spec examples', () => {
+    const a = new URL('https:example.org');
+    expect(a.href).toBe('https://example.org/');
+    const b = new URL('https://////example.com///');
+    expect(b.href).toBe('https://example.com///');
+    const c = new URL('https://example.com/././foo');
+    expect(c.href).toBe('https://example.com/foo');
+    const d = new URL('hello:world', 'https://example.com/');
+    expect(d.href).toBe('hello:world');
+    const e = new URL('https:example.org', 'https://example.com/');
+    expect(e.href).toBe('https://example.com/example.org');
+    const f = new URL('\\example\\..\\demo/.\\', 'https://example.com/');
+    expect(f.href).toBe('https://example.com/demo/');
+    const g = new URL('example', 'https://example.com/demo');
+    expect(g.href).toBe('https://example.com/example');
+  });
+
+  it('should support unicode', () => {
+    const a = new URL('https://r3---sn-p5qlsnz6.googlevideo.com');
+    expect(a.href).toBe('https://r3---sn-p5qlsnz6.googlevideo.com');
+  });
+
+  // https://github.com/facebook/react-native/issues/25717
+  it('should pass issue #25717 example', () => {
+    const a = new URL('about', 'https://www.mozilla.org');
+    expect(a.href).toBe('https://www.mozilla.org/about');
+
+    const b = new URL('dev', 'https://google.dev');
+    expect(b.href).toBe('https://google.dev/dev');
+  });
+
+  // https://github.com/facebook/react-native/issues/24428
+  it('should pass issue #24428 example', () => {
+    const url = new URL(
+      'https://facebook.github.io/react-native/img/header_logo.png',
+    );
+    expect(url.href).toBe(
+      'https://facebook.github.io/react-native/img/header_logo.png',
+    );
+  });
 });