val response1 = call1.execute()
    val response2 = call2.execute()
    assertThat(response1.body.source().readUtf8(3)).isEqualTo("ABC")
    assertThat(response2.body.source().readUtf8(3)).isEqualTo("GHI")
    assertThat(response1.body.source().readUtf8(3)).isEqualTo("DEF")
    assertThat(response2.body.source().readUtf8(3)).isEqualTo("JKL")
    val c0e0 = server.takeRequest()
    assertThat(c0e0.connectionIndex).isEqualTo(0)

    server.enqueue(MockResponse(body = "abc"))
    server.enqueue(MockResponse(body = "def"))
    server.enqueue(MockResponse(body = "ghi"))
    executeSynchronously("/a").assertBody("abc")
    executeSynchronously("/b").assertBody("def")
    executeSynchronously("/c").assertBody("ghi")
    assertThat(server.takeRequest().exchangeIndex).isEqualTo(0)
    assertThat(server.takeRequest().exchangeIndex).isEqualTo(1)