A modern programming language that makes developers happier.

kotlinlang

using mockito-kotlin (<https://github.com/nhaarman/mockito-kotlin>) how can I mock the method: `public &lt;T&gt; ResponseEntity&lt;T&gt; exchange(RequestEntity&lt;?&gt; requestEntity, ParameterizedTypeReference&lt;T&gt; responseType)`

I am just struggling with generics and syntax:

```
val mockRestTemplate = mock&lt;RestTemplate&gt; {
            val r : ElasticResult&lt;Map&lt;String, Any&gt;&gt;
            on { exchange(any&lt;RequestEntity&lt;String&gt;&gt;(), any&lt;ParameterizedTypeReference&lt;ElasticResult&lt;Map&lt;String, Any&gt;&gt;&gt;&gt;()) }
        }
```

looks OK, but how do I specify `doReturn r` ?

the syntax is `on { methodCall() } doReturn result`

```
val result = mock&lt;ElasticResult&lt;Map&lt;String, Any&gt;&gt;&gt; {}
        val mockRestTemplate = mock&lt;RestTemplate&gt; {
            on { exchange(any&lt;RequestEntity&lt;String&gt;&gt;(),
                    any&lt;ParameterizedTypeReference&lt;ElasticResult&lt;Map&lt;String, Any&gt;&gt;&gt;&gt;()) } doReturn result
        }
```

gives

```
Error:(29, 91) Kotlin: None of the following functions can be called with the arguments supplied: 
public infix fun &lt;T&gt; OngoingStubbing&lt;???&gt;.doReturn(t: ???): OngoingStubbing&lt;???&gt; defined in com.nhaarman.mockito_kotlin
public fun &lt;T&gt; OngoingStubbing&lt;???&gt;.doReturn(t: ???, vararg ts: ???): OngoingStubbing&lt;???&gt; defined in com.nhaarman.mockito_kotlin
public infix inline fun &lt;reified T&gt; OngoingStubbing&lt;ResponseEntity&lt;ElasticResult&lt;Map&lt;String, Any&gt;&gt;!&gt;!&gt;.doReturn(ts: List&lt;ResponseEntity&lt;ElasticResult&lt;Map&lt;String, Any&gt;&gt;!&gt;!&gt;): OngoingStubbing&lt;ResponseEntity&lt;ElasticResult&lt;Map&lt;String, Any&gt;&gt;!&gt;!&gt; defined in com.nhaarman.mockito_kotlin
```

Your `any&lt;ParameterizedTypeReference&lt;ElasticResult&lt;Map&lt;String, Any&gt;&gt;&gt;&gt;` is invalid, it should be `any&lt;ParameterizedTypeReference&lt;Map&lt;String, Any&gt;&gt;&gt;`

er, no, the call I am trying to mock looks like this:

```
val request = RequestEntity&lt;String&gt;(body, <http://HttpMethod.POST|HttpMethod.POST>, endpoint)
val respType = object : ParameterizedTypeReference&lt;ElasticResult&lt;Map&lt;String, Any&gt;&gt;&gt;() {}
restTemplate.exchange(request, respType)
```

Then you need to modify `result` to `val result = mock&lt;ResponseEntity&lt;ElasticResult&lt;Map&lt;String, Any&gt;&gt;&gt;&gt;()`

```
      val result = mock&lt;ResponseEntity&lt;ElasticResult&lt;Map&lt;String, Any&gt;&gt;&gt;&gt; {}
        val mockRestTemplate = mock&lt;RestTemplate&gt; {
            on { exchange(any&lt;RequestEntity&lt;String&gt;&gt;(), any&lt;ParameterizedTypeReference&lt;ElasticResult&lt;Map&lt;String, Any&gt;&gt;&gt;&gt;()) }.doReturn(result)
        }
```