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kotlinlang

Given that ktor now has `Introduce send and receive pipelines on all levels`(commit msg).
Wouldn't this test make sense (it fails):
```
    @Test
    fun testStatusMapping2() {
        withTestApplication {
            application.routing{
                route("/foo") {
                    install(StatusPages) {
                        statusFile(HttpStatusCode.NotFound, filePattern = "error#.html")
                    }
                    intercept(ApplicationCallPipeline.Call) {
                        call.respond(HttpStatusCode.NotFound)
                    }
                }
            }
            handleRequest(HttpMethod.Get, "/foo").let { call -&gt;
                assertEquals("&lt;html&gt;&lt;body&gt;error 404&lt;/body&gt;&lt;/html&gt;", call.response.content)
            }
        }
    }
```
It's a copy/paste of testStatusMapping test, but with statuspages installed under a route pipeline

<https://github.com/Kotlin/ktor/issues/193>