Add fabricated violation tests for restricted import rules

tests/eslint/restricted-imports.test.ts

@@ -0,0 +1,80 @@
+import { describe, expect, it } from "vitest";
+import { execSync } from "node:child_process";
+import fs from "node:fs";
+import path from "node:path";
+import crypto from "node:crypto";
+
+const ROOT = path.resolve(import.meta.dirname, "../..");
+
+/** Short random suffix to avoid collisions when tests run in parallel. */
+function uid(): string {
+  return crypto.randomBytes(4).toString("hex");
+}
+
+function lintString(filePath: string, content: string): string {
+  const absPath = path.join(ROOT, filePath);
+  fs.mkdirSync(path.dirname(absPath), { recursive: true });
+  fs.writeFileSync(absPath, content, "utf8");
+  try {
+    execSync(`pnpm exec eslint "${absPath}" --format json`, {
+      cwd: ROOT,
+      encoding: "utf8",
+      stdio: ["pipe", "pipe", "pipe"],
+    });
+    return "PASS";
+  } catch (err: unknown) {
+    const error = err as { stdout?: string };
+    return error.stdout ?? "UNKNOWN_ERROR";
+  } finally {
+    fs.unlinkSync(absPath);
+    // Remove empty parent directories created for probes
+    let dir = path.dirname(absPath);
+    const srcDir = path.join(ROOT, "src");
+    while (dir.length > srcDir.length) {
+      try {
+        fs.rmdirSync(dir);
+      } catch {
+        break;
+      }
+      dir = path.dirname(dir);
+    }
+  }
+}
+
+describe("no-restricted-imports rules", () => {
+  it("blocks @opentelemetry/sdk-metrics outside otel.ts", () => {
+    const id = uid();
+    const result = lintString(
+      `src/features/online-board/__ri_probe_${id}__.ts`,
+      'import { MeterProvider } from "@opentelemetry/sdk-metrics";\nexport const x = MeterProvider;\n',
+    );
+    expect(result).toContain("no-restricted-imports");
+  });
+
+  it("blocks react-i18next outside provider.tsx", () => {
+    const id = uid();
+    const result = lintString(
+      `src/features/online-board/__ri_probe_${id}__.ts`,
+      'import { useTranslation } from "react-i18next";\nexport const x = useTranslation;\n',
+    );
+    expect(result).toContain("no-restricted-imports");
+  });
+
+  it("blocks @microsoft/signalr in routes/ (SSR bundle)", () => {
+    const id = uid();
+    const result = lintString(
+      `src/routes/__probe_${id}__/__ri_probe__.ts`,
+      'import { HubConnectionBuilder } from "@microsoft/signalr";\nexport const x = HubConnectionBuilder;\n',
+    );
+    expect(result).toContain("no-restricted-imports");
+  });
+
+  it("blocks localStorage outside storage.ts", () => {
+    const id = uid();
+    const result = lintString(
+      `src/features/online-board/__ri_probe_${id}__.ts`,
+      'const x = localStorage.getItem("key");\nexport default x;\n',
+    );
+    expect(result).toContain("no-restricted-globals");
+  });
+});