Restfuse POST file does not frame the request correctly

Following is the restfuse test case to send a file:

``` java
@HttpTest(method = Method.POST, path = "/api/test/file/v1",
type = MediaType.MULTIPART_FORM_DATA,
headers = {
@Header(name = "Content-Type", value = "multipart/form-data; boundary=--ABC")
},
file = "/test.txt"
)
public void testPostFile() {
Assert.assertOk(response);
}
```

This sends HTTP request as below:

```
POST http://localhost:8888/api/test/file/v1 HTTP/1.1
Content-Type: multipart/form-data; boundary=--ABC
User-Agent: Java/1.7.0_21
Host: localhost:8888
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive
Content-Length: 9

TEST!!!
```

When the same request is sent through Postman chrome extension, the request is:

```
POST http://localhost:8080/api/test/file/v1 HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Content-Length: 191
Cache-Control: no-cache
Origin: chrome-extension://fdmmgilgnpjigdojojpjoooidkmcomcm
type: multipart/form-data
User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.71 Safari/537.36
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryegsX8TPws99lAi9O
Accept: */*
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.8
Cookie: __atuvc=1%7C39; CUSTOMER_UUID=cd9fbf8b-1248-4773-80fe-917d7abd0a38

------WebKitFormBoundaryegsX8TPws99lAi9O
Content-Disposition: form-data; name="file"; filename="test.txt"
Content-Type: text/plain

TEST!!!

------WebKitFormBoundaryegsX8TPws99lAi9O--
```

Restfuse does not seem to add the file boundaries automatically. What are we missing?