Add DNS diagnostics across dataplane and client

test/server/connectivity-diagnostics.test.js

@@ -192,7 +192,15 @@ test('connectivity use case keeps applied priority, selected fallback and error
 test('diagnostics settings validate and replace one canonical revision', () => {
   let state = {
     revision: 7,
-    diagnostics: { configured: false, customServices: [], hiddenServiceIds: [] },
+    diagnostics: {
+      configured: false,
+      customServices: [],
+      hiddenServiceIds: [],
+      customDnsResolvers: [{
+        id: 'custom-dns-office', label: 'Office', kind: 'dns', endpoint: '192.168.1.1',
+      }],
+      customDnsDomains: [{ id: 'custom-domain-office', label: 'Office', hostname: 'office.example.com' }],
+    },
   };
   const useCase = createConnectivityDiagnosticsUseCase({
     state: {
@@ -212,6 +220,10 @@ test('diagnostics settings validate and replace one canonical revision', () => {
     configured: true,
     customServices: [{ id: 'custom-status', label: 'Status', url: 'https://example.com/status' }],
     hiddenServiceIds: ['speedtest'],
+    customDnsResolvers: [{
+      id: 'custom-dns-office', label: 'Office', kind: 'dns', endpoint: '192.168.1.1',
+    }],
+    customDnsDomains: [{ id: 'custom-domain-office', label: 'Office', hostname: 'office.example.com' }],
   });
   assert.equal(state.revision, 8);
   assert.throws(() => useCase.updateSettings({ customServices: [], hiddenServiceIds: [] }, 7), {
@@ -245,6 +257,11 @@ test('connectivity route preserves exact URL, defaults and raw response', async
         calls.push(args);
         return { checkedAt: 'now', vpn: { server: null } };
       },
+      dnsCatalog: async () => ({ resolvers: [{ id: 'google-dns' }], domains: [] }),
+      runDns: async (...args) => {
+        calls.push(['dns', ...args]);
+        return { checkedAt: 'dns-now', results: [] };
+      },
       updateSettings: (...args) => calls.push(['settings', ...args]),
     },
     readBody: async () => {
@@ -276,6 +293,16 @@ test('connectivity route preserves exact URL, defaults and raw response', async
   assert.deepEqual(calls.at(-1), ['settings', body.settings, 4]);
   assert.equal(settingsResponse.payload.success, true);
 
+  const catalogResponse = routeResponse();
+  assert.equal(await route.handle({ method: 'GET', url: '/api/diagnostics/dns' }, catalogResponse), true);
+  assert.deepEqual(catalogResponse.payload, { resolvers: [{ id: 'google-dns' }], domains: [] });
+
+  body = { domainId: 'youtube', resolverId: 'google-dns' };
+  const dnsResponse = routeResponse();
+  assert.equal(await route.handle({ method: 'POST', url: '/api/diagnostics/dns' }, dnsResponse), true);
+  assert.deepEqual(calls.at(-1), ['dns', 'youtube', 'google-dns']);
+  assert.deepEqual(dnsResponse.payload, { checkedAt: 'dns-now', results: [] });
+
   for (const [method, url] of [
     ['GET', '/api/diagnostics/connectivity'],
     ['POST', '/api/diagnostics/connectivity?target=all'],
@@ -284,7 +311,7 @@ test('connectivity route preserves exact URL, defaults and raw response', async
   ]) {
     assert.equal(await route.handle({ method, url }, routeResponse()), false);
   }
-  assert.equal(bodyReads, 3);
+  assert.equal(bodyReads, 4);
 });
 
 test('a targeted IP row uses three samples and keeps the majority address', async () => {