Fix the ignoreStream tests for Node.js v14.

Fixes jaydenseric/graphql-upload#209 .

changelog.md

@@ -14,6 +14,7 @@
 - Configured Prettier option `semi` to the default, `true`.
 - Ensure GitHub Actions run on pull request.
 - Also run GitHub Actions with Node.js v14.
+- Fixed the `ignoreStream` function tests for Node.js v14 with a new `CountReadableStream` test helper, fixing [#209](https://github.com/jaydenseric/graphql-upload/issues/209).
 - Minor JSDoc wording tweak for consistency.
 
 ## 10.0.0

test/CountReadableStream.js

@@ -0,0 +1,23 @@
+'use strict';
+
+const { Readable } = require('stream');
+
+/**
+ * A count readable stream, for testing purposes.
+ * @kind class
+ * @name CountReadableStream
+ * @see [Example counting stream in the Node.js docs](https://nodejs.org/api/stream.html#stream_an_example_counting_stream).
+ * @ignore
+ */
+module.exports = class CountReadableStream extends Readable {
+  constructor(options) {
+    super(options);
+    this._max = 1000000;
+    this._index = 1;
+  }
+
+  _read() {
+    const i = this._index++;
+    this.push(i > this._max ? null : Buffer.from(String(i), 'ascii'));
+  }
+};

test/lib/ignoreStream.test.js

@@ -1,20 +1,20 @@
 'use strict';
 
 const { doesNotThrow, strictEqual } = require('assert');
-const { Readable } = require('stream');
 const ignoreStream = require('../../lib/ignoreStream');
+const CountReadableStream = require('../CountReadableStream');
 
 module.exports = (tests) => {
   tests.add('`ignoreStream` ignores errors.', () => {
     doesNotThrow(() => {
-      const stream = new Readable();
+      const stream = new CountReadableStream();
       ignoreStream(stream);
       stream.emit('error', new Error('Message.'));
     });
   });
 
   tests.add('`ignoreStream` resumes a paused stream.', () => {
-    const stream = new Readable();
+    const stream = new CountReadableStream();
     stream.pause();
     ignoreStream(stream);
     strictEqual(stream.isPaused(), false);