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kotlinlang

can i use the test host directly without using `withTestApplication`?

i have unit tests that spin up ktor on a random port and send request to it, and i want to convert them to use the test host for performance reasons

something like ```val testApplication = ...
testApplication.handleRequest(...)
testApplication.close()
```

AFAIK the point of the test infrastructure is to *not* open a port etc. 

```
            val te = TestApplicationEngine(environment = createTestEnvironment {
                module(Application::main)
            }) {}.apply { start() }

            te.handleRequest(...)
            te.stop(0, 0, TimeUnit.MILLISECONDS)

```