Initial Dockge image update checker

test/compose-parser.test.js

@@ -0,0 +1,35 @@
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import { parseComposeImages } from "../src/compose-parser.js";
+
+test("extracts service images from compose content", () => {
+  const compose = `
+services:
+  web:
+    image: nginx:1.27
+  api:
+    build: .
+    image: "ghcr.io/example/api:main" # comment
+networks:
+  default:
+`;
+
+  assert.deepEqual(parseComposeImages(compose), [
+    { service: "web", image: "nginx:1.27", line: 4 },
+    { service: "api", image: "ghcr.io/example/api:main", line: 7 },
+  ]);
+});
+
+test("ignores top-level image keys outside services", () => {
+  const compose = `
+x-template:
+  image: ignored
+services:
+  worker:
+    image: alpine
+`;
+
+  assert.deepEqual(parseComposeImages(compose), [
+    { service: "worker", image: "alpine", line: 6 },
+  ]);
+});