Track HiveGrid Cloud planning reference

hivegrid-cloud/scripts/verify-test-density.test.mjs

@@ -0,0 +1,66 @@
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { afterEach, describe, it } from "vitest";
+
+import { evaluateTargets, formatSummary, walk } from "./verify-test-density.mjs";
+
+const tempRoots = [];
+
+function makeRoot() {
+  const root = fs.mkdtempSync(path.join(os.tmpdir(), "verify-test-density-"));
+  tempRoots.push(root);
+  return root;
+}
+
+function writeFile(root, filePath, contents = "export {};") {
+  const fullPath = path.join(root, filePath);
+  fs.mkdirSync(path.dirname(fullPath), { recursive: true });
+  fs.writeFileSync(fullPath, contents, "utf8");
+}
+
+afterEach(() => {
+  for (const root of tempRoots.splice(0)) {
+    fs.rmSync(root, { force: true, recursive: true });
+  }
+});
+
+describe("verify-test-density", () => {
+  it("counts source and test files while ignoring generated and declaration files", () => {
+    const root = makeRoot();
+    writeFile(root, "src/index.ts");
+    writeFile(root, "src/component.tsx");
+    writeFile(root, "src/component.test.tsx");
+    writeFile(root, "src/types.d.ts");
+    writeFile(root, "src/generated/client.ts");
+    writeFile(root, "src/.react-router/types.ts");
+    writeFile(root, "src/node_modules/pkg/source.ts");
+
+    assert.deepEqual(walk(path.join(root, "src")), { source: 2, test: 1 });
+  });
+
+  it("passes, fails, and skips targets using stable report lines", () => {
+    const root = makeRoot();
+    writeFile(root, "well/a.ts");
+    writeFile(root, "well/a.test.ts");
+    writeFile(root, "weak/a.ts");
+    writeFile(root, "weak/b.ts");
+
+    const result = evaluateTargets(
+      [
+        { name: "well-covered", root: "well", minRatio: 0.5 },
+        { name: "under-covered", root: "weak", minRatio: 0.5 },
+        { name: "empty", root: "missing", minRatio: 0.5 },
+      ],
+      root
+    );
+
+    assert.deepEqual(result.passes, [
+      "PASS well-covered source=1 tests=1 ratio=1.000 min=0.500",
+      "SKIP empty no source files",
+    ]);
+    assert.deepEqual(result.failures, ["FAIL under-covered source=2 tests=0 ratio=0.000 min=0.500 (drift=-0.500)"]);
+    assert.equal(formatSummary(result), "Summary: 2 passed, 0 observed, 1 failed");
+  });
+});