tests: add test to confirm issue

test-node/standalone/multipart_parser.test.js

@@ -0,0 +1,27 @@
+import {Readable} from 'node:stream';
+import MultipartParser from '../../src/parsers/Multipart.js';
+import {malformedMultipart} from '../../src/FormidableError.js';
+
+import test from 'node:test';
+import assert, { deepEqual } from 'node:assert';
+
+
+
+test('MultipartParser does not hang', async (t) => {
+    const mime = `--_\r\n--_--\r\n`;
+    const parser = new MultipartParser();
+    parser.initWithBoundary('_');
+    try {
+        for await (const {name, buffer, start, end} of Readable.from(mime).pipe(parser)) {
+            console.log(name, buffer ? buffer.subarray(start, end).toString() : '');
+        }
+
+    } catch (e) {
+        deepEqual(e.code, malformedMultipart)
+        return;
+        // console.error('error');
+        // console.error(e);
+
+    }
+    assert(false, 'should catch error');
+});