Postman collection running normally but Monitor is failing with bad request - postman

I am testing my API using Postman monitor and the request is failing with bad request. When I run it normally using the Collection, all the tests are passing.
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How to mock client inside paymentintent for Stripe?

Currently we are using paymentintent.New() method to create a payment intent for stripe but the issue we are facing is in writing unit tests (for integration test, we are already aware of stripe-mock)
Inside this method, a http client is created internally. Not sure how can we mock it.
https://github.com/stripe/stripe-go/blob/master/paymentintent/client.go#L24
We have tried generating the mock of stripe http client by ourselves but that won't help much since paymentintent internally creates a HTTP client and we don't see a way to pass our own http client inside the paymentintent method
stripe-go is using stripe-mock internally for unit testing. You can see this piece of code to learn how to set a mock server for you unit tests.

What are different ways to run the client application to verify the response without having server?

I have a CPP client application. As part of client application, I will send a message in encrypt format to http server which will available as part of another server application.
Currently, server application is not yet implemented. But I want to test the client application by running it and I want to verify the response.
What are different ways to run the client application to verify the response without having server? Please help me.
Thanks.
Create a small server in local that returns the value who received it.
If you are verifying the response from the server it sounds more like you are unit testing the server instead of the client. Or like an end-to-end test.
If you do want to unit test your client application and you have a separate class that handles the communication, you can mock this communication class and return a hard-coded response. Use this to test if your client handles this response correctly.
If this is not possible you can run a mock HTTP server, as #yumetodo suggests, in a separate process or thread. httpmockserver seems to provide such a server.

Test auto increment function of web service with simultaneous users

I have a web service that does a simple task of 'auto-incrementing' a simple field.I test it using SoapUI. That is, whenever I run SoapUI, the response would be a value that is one plus it's previous value. Now, the catch is, I want to test simultaneous users running the same web service. Meaning, if they all access the web service at once, the web service will respond with the correct incremented value.
For instance, I have 3 users who accessed the service at the same time. I am expecting that the response (integer value) they would get will not be the same with each other. It should be incremental. That's what I want to test.
I'm thinking of maybe incorporating JMeter and SoapUI, but I'm not sure if that's even possible. Do you have any suggestions on how I can handle this?
SoapUI offers some limited load testing capabilities so if you think the load from one machine will be enough and you will be happy with the load test metrics which reflect only average/min/max response times and throughput - you can conduct your load test using SoapUI only.
If you decide to go for JMeter - be aware that you can migrate your test in at least 2 ways:
Record running SoapUI test scenario using JMeter's HTTP(S) Test Script Recorder
Taurus automation framework comes with SoapUI xml to JMeter jmx converter.
If you want to do it manually check out Building a SOAP WebService Test Plan JMeter User Manual chapter
In order to "tell" JMeter to execute HTTP Request samplers with the desired amount of virtual users at exactly the same moment add Synchronizing Timer as a child of the relevant HTTP Request sampler.

Is there some way to test a Grails CXF client call by providing a response?

I have a grails 2.3.x webapp that uses CXF to call to backend SOAP services. I'd like to set up a test where I call my service, but provide the response back from the service as a string directly to test it.
So, I want to set up a test that will autowire the service. I then set the response somehow as a string. Call the service method under test and under the covers it receives the response string I set and the request is ignored (or possibly even could check its validity). It parses the response which goes through the service code and returns as usual.
I don't want to have to run a separate server for the test. Is there someway to put in the response directly?

Combine E2E testing with HTTP web services testing

Can I catch HTTP request\response from the protractor, I want to create E2E tests with validation of the web services using JSON.
You can only capture request, response through a proxy. Selenium-webdriver doesn't support this feature since it is limited to only browser simulation. One of the most well known proxies for inspecting request, response is browsermob-proxy. You can either directly use its API or use the node client browsermob-node. Once You have a proxy running, you can set driver capabilities in your protractor config like below
capabilities: {
'proxy': {
'proxyType': 'manual',
'httpProxy': 'hostname.com:1234'
}
}