test: migrate from bun to pnpm and vitest

testSetup.ts

@@ -1,3 +1,26 @@
-if (process.env.SHOULD_LOG_ERRORS === "false") {
-  console.error = () => {};
+import { vi } from "vitest";
+
+const shouldLogErrors = process.env["SHOULD_LOG_ERRORS"] === "true";
+
+if (!shouldLogErrors) {
+  const originalConsoleError = console.error;
+  console.error = (...args) => {
+    // Suppress specific error messages
+    if (
+      args[0]?.includes?.("Error: No email provided") ||
+      args[0]?.includes?.('TypeError: "pkcs8" must be PKCS#8 formatted string')
+    ) {
+      return;
+    }
+    originalConsoleError(...args);
+  };
 }
+
+global.fetch = vi.fn();
+
+vi.mock("cloudflare:workers", () => {
+  return {
+    env: {},
+    DurableObject: class DurableObject {},
+  };
+});