build(aio): test Firebase hosting redirection configuration (#21763)

PR Close #21763

aio/tests/deployment/testFirebaseRedirection.spec.ts

@@ -0,0 +1,31 @@
+import { getRedirector, loadLegacyUrls, loadRedirects, loadSitemapUrls } from './helpers';
+
+describe('firebase.json redirect config', () => {
+  describe('with sitemap urls', () => {
+    loadSitemapUrls().forEach(url => {
+      it('should not redirect any urls in the sitemap', () => {
+        expect(getRedirector().redirect(url)).toEqual(url);
+      });
+    });
+  });
+
+  describe('with legacy urls', () => {
+    loadLegacyUrls().forEach(urlPair => {
+      it('should redirect the legacy urls', () => {
+        const redirector = getRedirector();
+        expect(redirector.redirect(urlPair[0])).not.toEqual(urlPair[0]);
+        if (urlPair[1]) {
+          expect(redirector.redirect(urlPair[0])).toEqual(urlPair[1]);
+        }
+      });
+    });
+
+    describe('destinations', () => {
+      loadRedirects().forEach(redirect => {
+        it('should match pattern "^(https?:/)?/.*"', () => {
+          expect(redirect.destination).toMatch(/^(https?:\/)?\/.*/);
+        });
+      });
+    });
+  });
+});