feat(FN-3297): add test coverage for incomplete runtime dist trees

Adds test coverage for incomplete runtime dist trees in the test-artifacts script, with one new test file and a small fix to the script itself.

Fusion-Task-Id: FN-3297

scripts/__tests__/ensure-test-artifacts.test.mjs

@@ -1,10 +1,14 @@
 import test from "node:test";
 import assert from "node:assert/strict";
-import { detectMissingArtifacts, ensureTestArtifacts } from "../ensure-test-artifacts.mjs";
+import {
+  detectMissingArtifacts,
+  ensureTestArtifacts,
+  REQUIRED_BUILD_PACKAGES,
+} from "../ensure-test-artifacts.mjs";
 
 test("detectMissingArtifacts returns missing package list", () => {
   const missing = detectMissingArtifacts("/repo", () => false);
-  assert.ok(missing.length >= 5);
+  assert.equal(missing.length, REQUIRED_BUILD_PACKAGES.length);
   assert.equal(missing[0].name, "@fusion/core");
 });
 
@@ -31,3 +35,48 @@ test("ensureTestArtifacts builds only missing packages", () => {
   assert.equal(calls[0].cmd, "pnpm");
   assert.deepEqual(calls[0].args, ["--filter", "@fusion-plugin-examples/openclaw-runtime", "build"]);
 });
+
+test("detectMissingArtifacts flags hermes when dist/index.js exists but dist/cli-spawn.js is missing", () => {
+  const missing = detectMissingArtifacts("/repo", (fullPath) => !fullPath.endsWith("dist/cli-spawn.js"));
+  const names = missing.map((pkg) => pkg.name);
+
+  assert.ok(names.includes("@fusion-plugin-examples/hermes-runtime"));
+});
+
+test("ensureTestArtifacts rebuilds hermes for incomplete dist artifacts", () => {
+  const calls = [];
+  const built = ensureTestArtifacts(
+    "/repo",
+    (cmd, args, cwd) => calls.push({ cmd, args, cwd }),
+    (fullPath) => !fullPath.endsWith("plugins/fusion-plugin-hermes-runtime/dist/cli-spawn.js"),
+  );
+
+  assert.deepEqual(built, ["@fusion-plugin-examples/hermes-runtime"]);
+  assert.equal(calls.length, 1);
+  assert.equal(calls[0].cmd, "pnpm");
+  assert.deepEqual(calls[0].args, ["--filter", "@fusion-plugin-examples/hermes-runtime", "build"]);
+});
+
+test("detectMissingArtifacts flags openclaw when dist/index.js exists but transitive files are missing", () => {
+  const missing = detectMissingArtifacts(
+    "/repo",
+    (fullPath) => fullPath.endsWith("plugins/fusion-plugin-openclaw-runtime/dist/index.js"),
+  );
+  const names = missing.map((pkg) => pkg.name);
+
+  assert.ok(names.includes("@fusion-plugin-examples/openclaw-runtime"));
+});
+
+test("ensureTestArtifacts rebuilds openclaw for incomplete dist artifacts", () => {
+  const calls = [];
+  const built = ensureTestArtifacts(
+    "/repo",
+    (cmd, args, cwd) => calls.push({ cmd, args, cwd }),
+    (fullPath) => !fullPath.endsWith("plugins/fusion-plugin-openclaw-runtime/dist/runtime-adapter.js"),
+  );
+
+  assert.deepEqual(built, ["@fusion-plugin-examples/openclaw-runtime"]);
+  assert.equal(calls.length, 1);
+  assert.equal(calls[0].cmd, "pnpm");
+  assert.deepEqual(calls[0].args, ["--filter", "@fusion-plugin-examples/openclaw-runtime", "build"]);
+});