Initial commit

src/lib/utm.test.ts

@@ -0,0 +1,27 @@
+import { describe, it, expect } from 'vitest';
+import { appendUtmParams } from './utm';
+
+describe('utm', () => {
+    describe('appendUtmParams', () => {
+        it('appends utm params to own-property URL', () => {
+            const href = 'https://mifi.dev/page';
+            const result = appendUtmParams(href, 'mifi.dev');
+            const url = new URL(result);
+            expect(url.searchParams.get('utm_source')).toBe('mifi.dev');
+            expect(url.searchParams.get('utm_medium')).toBe('link');
+            expect(url.searchParams.get('utm_campaign')).toBe('landing');
+        });
+
+        it('appends utm_content when provided', () => {
+            const href = 'https://mifi.bio/';
+            const result = appendUtmParams(href, 'mifi.bio', 'hero');
+            const url = new URL(result);
+            expect(url.searchParams.get('utm_content')).toBe('hero');
+        });
+
+        it('returns href unchanged for non-own-property host', () => {
+            const href = 'https://example.com/page';
+            expect(appendUtmParams(href, 'mifi.dev')).toBe(href);
+        });
+    });
+});