feat(lanes): detect docker-compose database/Redis and wire ENV_REWRITE (A3)

server/__tests__/lane-detect.test.js

@@ -107,3 +107,67 @@ describe("IDENTIFIER_RE", () => {
     }
   });
 });
+
+function writeCompose(repo, servicesYaml) {
+  fs.writeFileSync(path.join(repo, "docker-compose.yml"), `services:\n${servicesYaml}\n`);
+}
+
+describe("detectNode: database + Redis + env wiring", () => {
+  it("detects a postgres service in docker-compose.yml", () => {
+    const repo = makeRepo();
+    writePkg(path.join(repo, "backend"), { start: "node server.js" });
+    writePkg(path.join(repo, "frontend"), { dev: "vite" });
+    writeCompose(repo, "  postgres:\n    image: postgres:16\n");
+    const facts = detect.detectNode(repo);
+    assert.equal(facts.database.dbKind, "postgres");
+    assert.equal(facts.database.dbService, "postgres");
+    assert.match(facts.database.dbPrefix, /_l$/);
+    assert.equal(facts.redis, false);
+  });
+
+  it("detects redis independently of postgres", () => {
+    const repo = makeRepo();
+    writePkg(path.join(repo, "backend"), { start: "node server.js" });
+    writePkg(path.join(repo, "frontend"), { dev: "vite" });
+    writeCompose(repo, "  cache_redis:\n    image: redis:7\n");
+    const facts = detect.detectNode(repo);
+    assert.equal(facts.database, null);
+    assert.equal(facts.redis, true);
+  });
+
+  it("finds no database when there is no docker-compose.yml", () => {
+    const repo = makeRepo();
+    writePkg(repo, { start: "node index.js" });
+    const facts = detect.detectNode(repo);
+    assert.equal(facts.database, null);
+    assert.equal(facts.redis, false);
+    assert.equal(facts.env, null);
+  });
+
+  it("wires ENV_REWRITE when a database is found and backend/.env.example exists", () => {
+    const repo = makeRepo();
+    writePkg(path.join(repo, "backend"), { start: "node server.js" });
+    writePkg(path.join(repo, "frontend"), { dev: "vite" });
+    writeCompose(repo, "  postgres:\n    image: postgres:16\n  redis:\n    image: redis:7\n");
+    fs.writeFileSync(path.join(repo, "backend", ".env.example"), "FOO=bar\n");
+    const facts = detect.detectNode(repo);
+    assert.equal(facts.env.file, "backend/.env");
+    assert.equal(facts.env.source, "backend/.env.example");
+    assert.equal(facts.env.fromExample, true);
+    assert.deepEqual(facts.env.rewrite, ["DATABASE_URL", "REDIS_URL"]);
+  });
+
+  it("leaves env null when a database is found but there is no .env or .env.example", () => {
+    const repo = makeRepo();
+    writePkg(repo, { start: "node index.js" });
+    writeCompose(repo, "  postgres:\n    image: postgres:16\n");
+    assert.equal(detect.detectNode(repo).env, null);
+  });
+
+  it("rejects a docker-compose service name that fails the shell-identifier check", () => {
+    const repo = makeRepo();
+    writePkg(repo, { start: "node index.js" });
+    writeCompose(repo, '  "postgres; rm -rf /":\n    image: postgres:16\n');
+    assert.equal(detect.detectNode(repo).database, null);
+  });
+});