懸而未決參考類，方法

我是新來kotlin（今基本上開始）懸而未決參考類，方法

我想寫一個dsl像建設者我GRLMessage類。

data class GRLMessage(var method: GRLMethod, var headers: Map<String, String>, var multipart: Object) { 

    fun message(init: GRLMessage.() -> Unit) : GRLMessage { 
     init() 
     return this 
    } 

    fun method(init: GRLMessage.() -> GRLMethod) : GRLMessage { 
     method = init() 
     return this 
    } 

    fun headers(init: GRLMessage.() -> Unit) : GRLMessage { 
     init() 
     return this 
    } 

    fun header(init: GRLMessage.() -> Pair<String, String>) : GRLMessage { 
     headers.plus(init()) 
     return this 
    } 

    fun multipart(init: GRLMessage.() -> Object) : GRLMessage { 
     multipart = this.init() 
     return this 
    } 
}

爲了檢查它，我添加了測試。

import org.junit.Assert.* 
import org.junit.* 

class GRLMessageTest { 

    data class DummyMultipart(val field: String) {} 

    @Test fun grlMessageBuilderTest() { 
     val grlMessage = GrlMessage().message { 
      method { GRLMethod.POST } 
      headers { 
       header { Pair("contentType", "object") } 
       header { Pair("objectType", "DummyMultipart") } 
      } 
      multipart { DummyMultipart("dummy") } 
     } 

     val multipart = DummyMultipart("dummy") 
     val headers = mapOf(
       Pair("contentType", "object"), 
       Pair("objectType", "DummyMultipart") 
     ) 
     val method = GRLMethod.POST 

     assertEquals(multipart, grlMessage.multipart) 
     assertEquals(headers, grlMessage.headers) 
     assertEquals(method, grlMessage.method) 
    } 
}

這兩個類是在同一包（較 - 一個在src/main/kotlin，另一個是在src/test/kotlin）。

當我嘗試使用gradle build失敗上compileTestKotlin任務有錯誤

GRLMessageTest.kt: (13, 26): Unresolved reference: GrlMessage 
GRLMessageTest.kt: (14, 13): Unresolved reference: method 
GRLMessageTest.kt: (15, 13): Unresolved reference: headers 
GRLMessageTest.kt: (17, 17): Unresolved reference: header 
GRLMessageTest.kt: (19, 13): Unresolved reference: multipart

什麼問題來構建應用程序？

這裏是佈局