Add tests for sanitizeIRI.

src/lib/__tests__/urlHelper.spec.js

@@ -0,0 +1,55 @@
+import { sanitizeIRI } from '../urlHelper';
+
+describe('sanitizeIRI', () => {
+  // `sanitizeIRI` tests from RFC 3987
+  it('should keep valid URI chars (letters digits _ - . ~)', () => {
+    expect(
+      sanitizeIRI("This, that-one_or.the~other 123!")
+    ).toEqual('Thisthat-one_or.the~other123');
+  });
+  
+  it('should not remove accents', () => {
+    expect(
+      sanitizeIRI("ěščřžý")
+    ).toEqual('ěščřžý');
+  });
+  
+  it('should keep valid non-latin chars (ucschars in RFC 3987)', () => {
+    expect(
+      sanitizeIRI("日本語のタイトル")
+    ).toEqual('日本語のタイトル');
+  });
+
+  it('should not normalize Unicode strings', () => {
+    expect(
+      sanitizeIRI('\u017F\u0323\u0307')
+    ).toEqual('\u017F\u0323\u0307');
+    expect(
+      sanitizeIRI('\u017F\u0323\u0307')
+    ).not.toEqual('\u1E9B\u0323');
+  });
+  
+  it('should allow a custom replacement character', () => {
+    expect(
+      sanitizeIRI("duck\\goose.elephant", { replacement: '-' })
+    ).toEqual('duck-goose.elephant');
+  });
+  
+  it('should not allow an improper replacement character', () => {
+    expect(
+      sanitizeIRI("I! like! dollars!", { replacement: '$' })
+    ).not.toEqual('I$$like$$dollars$');
+    expect(
+      sanitizeIRI("I! like! dollars!", { replacement: '$' })
+    ).toThrow();
+  });
+  
+  it('should not actually URI-encode the characters', () => {
+    expect(
+      sanitizeIRI("🎉")
+    ).toEqual('🎉');
+    expect(
+      sanitizeIRI("🎉")
+    ).not.toEqual("%F0%9F%8E%89");
+  });
+});