test(ui): cover degraded overview health semantics

test/ui-server_test.ts

@@ -0,0 +1,55 @@
+import { assertEquals } from 'jsr:@std/assert@^1.0.0';
+import { ClusterManager } from '../ts/cluster/cluster-manager.ts';
+import { UiServer } from '../ts/ui/server.ts';
+
+Deno.test('UiServer overview mirrors degraded API health semantics', async () => {
+  const port = 20300 + Math.floor(Math.random() * 1000);
+  const cluster = new ClusterManager();
+  cluster.configure({
+    enabled: false,
+    nodeName: 'ui-test-node',
+    role: 'standalone',
+    bindHost: '127.0.0.1',
+    gossipPort: 7946,
+    heartbeatIntervalMs: 5000,
+    seedNodes: [],
+  });
+
+  const server = new UiServer(
+    { enabled: true, port, host: '127.0.0.1', assetSource: 'disk' },
+    {
+      async getAllStatus() {
+        return new Map([
+          ['vllm-1', { running: false, health: 'unhealthy' }],
+        ]);
+      },
+      async getAllAvailableModels() {
+        return new Map();
+      },
+    } as never,
+    cluster,
+  );
+
+  (server as unknown as {
+    gpuDetector: { detectGpus: () => Promise<unknown[]> };
+  }).gpuDetector = {
+    async detectGpus() {
+      return [{ id: 'nvidia-0' }];
+    },
+  };
+
+  await server.start();
+
+  try {
+    const response = await fetch(`http://127.0.0.1:${port}/_ui/overview`);
+    const body = await response.json();
+
+    assertEquals(response.status, 200);
+    assertEquals(body.health.status, 'degraded');
+    assertEquals(body.health.reasons.includes('unhealthy_container'), true);
+    assertEquals(body.health.reasons.includes('no_models_available'), true);
+    assertEquals(body.node.name, 'ui-test-node');
+  } finally {
+    await server.stop();
+  }
+});