Omit an empty value for user data to serialize properly.

droplets.go

@@ -99,7 +99,7 @@ type DropletCreateRequest struct {
 	Backups           bool                  `json:"backups"`
 	IPv6              bool                  `json:"ipv6"`
 	PrivateNetworking bool                  `json:"private_networking"`
-	UserData          string                `json:"user_data"`
+	UserData          string                `json:"user_data,omitempty"`
 }
 
 func (d DropletCreateRequest) String() string {

droplets_test.go

@@ -37,8 +37,8 @@ func TestDroplets_ListDropletsMultiplePages(t *testing.T) {
 
 		dr := dropletsRoot{
 			Droplets: []Droplet{
-				Droplet{ID: 1},
-				Droplet{ID: 2},
+				{ID: 1},
+				{ID: 2},
 			},
 			Links: &Links{
 				Pages: &Pages{Next: "http://example.com/v2/droplets/?page=2"},
@@ -135,7 +135,6 @@ func TestDroplets_Create(t *testing.T) {
 			"backups":            false,
 			"ipv6":               false,
 			"private_networking": false,
-			"user_data":          "",
 		}
 
 		var v map[string]interface{}

godo_test.go

@@ -85,7 +85,35 @@ func TestNewRequest(t *testing.T) {
 	inBody, outBody := &DropletCreateRequest{Name: "l"},
 		`{"name":"l","region":"","size":"","image":0,`+
 			`"ssh_keys":null,"backups":false,"ipv6":false,`+
-			`"private_networking":false,"user_data":""}`+"\n"
+			`"private_networking":false}`+"\n"
+	req, _ := c.NewRequest("GET", inURL, inBody)
+
+	// test relative URL was expanded
+	if req.URL.String() != outURL {
+		t.Errorf("NewRequest(%v) URL = %v, expected %v", inURL, req.URL, outURL)
+	}
+
+	// test body was JSON encoded
+	body, _ := ioutil.ReadAll(req.Body)
+	if string(body) != outBody {
+		t.Errorf("NewRequest(%v)Body = %v, expected %v", inBody, string(body), outBody)
+	}
+
+	// test default user-agent is attached to the request
+	userAgent := req.Header.Get("User-Agent")
+	if c.UserAgent != userAgent {
+		t.Errorf("NewRequest() User-Agent = %v, expected %v", userAgent, c.UserAgent)
+	}
+}
+
+func TestNewRequest_withUserData(t *testing.T) {
+	c := NewClient(nil)
+
+	inURL, outURL := "/foo", defaultBaseURL+"foo"
+	inBody, outBody := &DropletCreateRequest{Name: "l", UserData: "u"},
+		`{"name":"l","region":"","size":"","image":0,`+
+			`"ssh_keys":null,"backups":false,"ipv6":false,`+
+			`"private_networking":false,"user_data":"u"}`+"\n"
 	req, _ := c.NewRequest("GET", inURL, inBody)
 
 	// test relative URL was expanded