feat: Use asynchandler library for handlers

test/util/StaticAsyncHandler.ts

@@ -1,4 +1,4 @@
-import { AsyncHandler } from '../../src/util/handlers/AsyncHandler';
+import { AsyncHandler } from 'asynchronous-handlers';
 
 export class StaticAsyncHandler<TOut> extends AsyncHandler<any, TOut> {
   private readonly canHandleStatic: boolean;

test/util/Util.ts

@@ -105,6 +105,19 @@ export function compareMaps<TKey, TVal>(map1: Map<TKey, TVal>, map2: Map<TKey, T
   }
 }
 
+/**
+ * Returns the error thrown by the given function.
+ * Throws an error if the function does not throw.
+ */
+export async function getError(fn: () => any): Promise<Error> {
+  try {
+    await fn();
+  } catch (err: unknown) {
+    return err as Error;
+  }
+  throw new Error('Function did not throw');
+}
+
 /**
  * Mocks (some) functions of the fs system library.
  * It is important that you call `jest.mock('node:fs');` in your test file before calling this!!!