RxTest | Kotlin DSL for easier RxJava testing | Reactive Programming library

I am taking my first leap into the world of Rx and finding it difficult to get the desired results, especially with the GroupBy operator, so any help would be much appreciated.

How can I subscribe multiple observers to a specific group?

My requirements are:

I have a DataProvider class that makes http Api requests at regular intervals.
The http response is a List. Each Item has a unique Id property.
I need to process each Item as a separate stream based on its Id, which looks like a case for GroupBy.
Each group needs its own pipeline where:

• It Starts with a specific value (StartWith operator)
• It Buffers the previous Item for comparison with the current Item (Buffer(2,1) operator)
• If the current Item is different to the previous (Where) emit the current Item

The result is an IObservable of changes (ChangeStream). I am no longer dealing with a specific group.

How can I stay within the group pipeline and allow multiple subscribers to Subscribe to a specific group?

• Observers can subscribe early (before the Item.Id has appeared on the response stream and before the group is created)
• Observers can subscribe late (after the Item.Id has appeared on the response stream and the group has been created)
• Late subscribers should receive the last change for the Item.Id (Replay(1)) but I can’t seem to figure this part out either.

What is the Rx way to Multicast a specific group? Any help / advice would be much appreciated. I have provided sample code below.

I'm facing an issue of "Disallowed framework" when submitting to App Store. The issue is as follows

"ITMS-90726: Disallowed frameworks - Your app submission contains usages of the restricted framework libswiftXCTest.dylib. Remove these, rebuild and resubmit."

Upon my research, I found that RxTest framework is still using restricted framework libswiftXCTest.dylib

Xcode Version : 11.6

RxSwift Version : 5.1.1

1. How do I solve this issue ?
2. Has RxTest resolved this issue ?

I am trying to make a flowable with a backpressure. My idea is that new item of the flowable won't be emitted until one of the current items finishes its processing. I am using a ResourceSubscriber and subscribeWith() method to achieve that.

Each element of the flowable is being processed asynchronously on a separate thread pool. (Which I achieve by using flatMap/subscribeOn)

I expect that each element after second will be emitted AFTER onNext method of the subscriber called. However when I am trying to run this code the Flowable emits elements uncontrollably. The backpressure dosn't work.

There is the code to reproduce the issue:

I have just created my first project in RxSwift. The sample project named is RxSwift and added below pods in Podfile following the guidelines here.

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my imports

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i have a simple usecase class that looks like this: