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Best way to unit test classes using streams?

By : user2174889
Date : October 16 2020, 08:10 PM
seems to work fine I found GetBuffer on the MemoryStream which allows me to convert the raw buffer into a string and I can unit test the actual JSON blob however I want... here is what I wrote:
code :
    public void TestSerialize()
        var serializer = new MetroLineJSONSerializationStrategy();
        serializer.Source = new MetroLineDetails("Inland Empire Line", Colors.Blue, 'A', "LA Union Station", "San Bernardino", true, true);
        using (var stream = new MemoryStream())
            using (var writer = new StreamWriter(stream))
            var bytes = stream.GetBuffer();
            var json = System.Text.Encoding.UTF8.GetString(bytes);
            Assert.AreEqual('{', json[0]);

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How can I write a unit test with streams, promises and pipes together?

By : Trish Farley
Date : March 29 2020, 07:55 AM
wish of those help This may not be the prettiest solution but assuming you want to mock s3 and fs and test the on('error') and on('finish') behavior:
You could use a custom s3 mocking class, stub the original s3 and fs with sinon and trigger the events you want to test.
code :
// Custom S3 Mocking Library
class S3MockLibrary {
  constructor() {
    this.events = {};
  getObject(options) {
    return this;
  createReadStream() {
    return this;
  on(event, func) {
    this.events[event] = func;
    return this;
  pipe(file) {
    return this;
  emit(event, err) {
it('should verify', async () => {
  const s3Mock = new S3MockLibrary();
  const fsStub = sinon.stub(fs, 'createWriteStream').returns('success');
  const s3Stub = sinon.stub(s3, 'getObject').returns(s3Mock);

  // Emit the finish event async
  setTimeout(() => {
  }, 0);
  const result = await downloadFromBucket('test');



  assert.equal(result, `${process.cwd()}/data/test`);
it('should fail', async () => {
  const s3Mock = new S3MockLibrary();
  const fsStub = sinon.stub(fs, 'createWriteStream').returns('success');
  const s3Stub = sinon.stub(s3, 'getObject').returns(s3Mock);

  setTimeout(() => {
    s3Mock.emit('error', 'testError');
  }, 0);
  let error;
  await downloadFromBucket('test').catch((err) => {
    error = err;



  assert.equal(error, 'testError');

How to unit test Java 8 streams?

By : user1230622
Date : March 29 2020, 07:55 AM
it fixes the issue list.stream().forEach(e -> { dbCall.delete(e.Id());}); , You can use JUnit's InOrder.
code :
DbCall dbCall = mock(DbCall.class);
List<Element> list = Arrays.asList(newElement(1), newElement(2), newElement(3));


InOrder inorder = inOrder(dbCall);

Android - Is it possible to access instrumened test and unit test classes in androidTest and test folders programmatical

By : Chandra Mohan
Date : March 29 2020, 07:55 AM
may help you .
is there a way to access the test classes in androidTest and test folders from code?

How to unit test the Kafka Streams and Producer APIs together

By : petrhanak
Date : March 29 2020, 07:55 AM
This might help you You should not use a custom Producer but add a sink to your Topology. Calls to Producer.send() are async and thus you might be subject to data loss. To avoid data loss, you would need to make the call sync, ie, get the Future that is returned by send() and wait for its completion before process() returns. However, this has a big impact on your throughput and is not recommended.
If you add a sink you avoid those issue as Kafka Streams will now understand what data was sent to the output topic, and thus no data loss will happen, while Kafka Streams can use the more performant async call.

How to unit test Kafka Streams

By : BlueBones
Date : March 29 2020, 07:55 AM
hope this fix your issue I found a way around this, I'm not sure it is THE answer especially after https://stackoverflow.com/users/4953079/matthias-j-sax comment. In any case, sharing what I have so far...
I completely copied ProcessorTopologyTestDriver from the 0.10.1 branch (that's the version I'm using).
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