1 files changed, 177 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-stream3-pause-then-read.js b/tests/node_compat/test/parallel/test-stream3-pause-then-read.js
new file mode 100644
index 000000000..f840672ce
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-stream3-pause-then-read.js
@@ -0,0 +1,177 @@
+// deno-fmt-ignore-file
+// deno-lint-ignore-file
+
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// Taken from Node 18.12.1
+// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
+
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+'use strict';
+require('../common');
+const assert = require('assert');
+
+const stream = require('stream');
+const Readable = stream.Readable;
+const Writable = stream.Writable;
+
+const totalChunks = 100;
+const chunkSize = 99;
+const expectTotalData = totalChunks * chunkSize;
+let expectEndingData = expectTotalData;
+
+const r = new Readable({ highWaterMark: 1000 });
+let chunks = totalChunks;
+r._read = function(n) {
+  console.log('_read called', chunks);
+  if (!(chunks % 2))
+    setImmediate(push);
+  else if (!(chunks % 3))
+    process.nextTick(push);
+  else
+    push();
+};
+
+let totalPushed = 0;
+function push() {
+  const chunk = chunks-- > 0 ? Buffer.alloc(chunkSize, 'x') : null;
+  if (chunk) {
+    totalPushed += chunk.length;
+  }
+  console.log('chunks', chunks);
+  r.push(chunk);
+}
+
+read100();
+
+// First we read 100 bytes.
+function read100() {
+  readn(100, onData);
+}
+
+function readn(n, then) {
+  console.error(`read ${n}`);
+  expectEndingData -= n;
+  (function read() {
+    const c = r.read(n);
+    console.error('c', c);
+    if (!c)
+      r.once('readable', read);
+    else {
+      assert.strictEqual(c.length, n);
+      assert(!r.readableFlowing);
+      then();
+    }
+  })();
+}
+
+// Then we listen to some data events.
+function onData() {
+  expectEndingData -= 100;
+  console.error('onData');
+  let seen = 0;
+  r.on('data', function od(c) {
+    seen += c.length;
+    if (seen >= 100) {
+      // Seen enough
+      r.removeListener('data', od);
+      r.pause();
+      if (seen > 100) {
+        // Oh no, seen too much!
+        // Put the extra back.
+        const diff = seen - 100;
+        r.unshift(c.slice(c.length - diff));
+        console.error('seen too much', seen, diff);
+      }
+
+      // Nothing should be lost in-between.
+      setImmediate(pipeLittle);
+    }
+  });
+}
+
+// Just pipe 200 bytes, then unshift the extra and unpipe.
+function pipeLittle() {
+  expectEndingData -= 200;
+  console.error('pipe a little');
+  const w = new Writable();
+  let written = 0;
+  w.on('finish', () => {
+    assert.strictEqual(written, 200);
+    setImmediate(read1234);
+  });
+  w._write = function(chunk, encoding, cb) {
+    written += chunk.length;
+    if (written >= 200) {
+      r.unpipe(w);
+      w.end();
+      cb();
+      if (written > 200) {
+        const diff = written - 200;
+        written -= diff;
+        r.unshift(chunk.slice(chunk.length - diff));
+      }
+    } else {
+      setImmediate(cb);
+    }
+  };
+  r.pipe(w);
+}
+
+// Now read 1234 more bytes.
+function read1234() {
+  readn(1234, resumePause);
+}
+
+function resumePause() {
+  console.error('resumePause');
+  // Don't read anything, just resume and re-pause a whole bunch.
+  r.resume();
+  r.pause();
+  r.resume();
+  r.pause();
+  r.resume();
+  r.pause();
+  r.resume();
+  r.pause();
+  r.resume();
+  r.pause();
+  setImmediate(pipe);
+}
+
+
+function pipe() {
+  console.error('pipe the rest');
+  const w = new Writable();
+  let written = 0;
+  w._write = function(chunk, encoding, cb) {
+    written += chunk.length;
+    cb();
+  };
+  w.on('finish', () => {
+    console.error('written', written, totalPushed);
+    assert.strictEqual(written, expectEndingData);
+    assert.strictEqual(totalPushed, expectTotalData);
+    console.log('ok');
+  });
+  r.pipe(w);
+}