test(etapi): port api-metrics

apps/server/spec/etapi/api-metrics.spec.ts

@@ -0,0 +1,48 @@
+import { Application } from "express";
+import { beforeAll, describe, expect, it } from "vitest";
+import buildApp from "../../src/app.js";
+import supertest from "supertest";
+
+let app: Application;
+let token: string;
+
+// TODO: This is an API test, not ETAPI.
+
+describe("api/metrics", () => {
+    beforeAll(async () => {
+        app = await buildApp();
+    });
+
+    it("returns Prometheus format by default", async () => {
+        const response = await supertest(app)
+            .get("/api/metrics")
+            .expect(200);
+        expect(response.headers["content-type"]).toContain("text/plain");
+        expect(response.text).toContain("trilium_info");
+        expect(response.text).toContain("trilium_notes_total");
+        expect(response.text).toContain("# HELP");
+        expect(response.text).toContain("# TYPE");
+    });
+
+    it("returns JSON when requested", async() => {
+        const response = await supertest(app)
+            .get("/api/metrics?format=json")
+            .expect(200);
+        expect(response.headers["content-type"]).toContain("application/json");
+        expect(response.body.version).toBeTruthy();
+        expect(response.body.database).toBeTruthy();
+        expect(response.body.timestamp).toBeTruthy();
+        expect(response.body.database.totalNotes).toBeTypeOf("number");
+        expect(response.body.database.activeNotes).toBeTypeOf("number");
+        expect(response.body.noteTypes).toBeTruthy();
+        expect(response.body.attachmentTypes).toBeTruthy();
+        expect(response.body.statistics).toBeTruthy();
+    });
+
+    it("returns error on invalid format", async() => {
+        const response = await supertest(app)
+            .get("/api/metrics?format=xml")
+            .expect(500);
+        expect(response.body.message).toContain("prometheus");
+    });
+});