Add integration tests for feed creation

vendor/github.com/miniflux/miniflux-go/README.md

@@ -34,7 +34,7 @@ func main() {
     client := miniflux.NewClient("https://api.example.org", "admin", "secret")
 
     // Fetch all feeds.
-    feeds, err := userClient.Feeds()
+    feeds, err := client.Feeds()
     if err != nil {
         fmt.Println(err)
         return

vendor/github.com/miniflux/miniflux-go/client.go

@@ -214,23 +214,27 @@ func (c *Client) Feed(feedID int64) (*Feed, error) {
 }
 
 // CreateFeed creates a new feed.
-func (c *Client) CreateFeed(url string, categoryID int64) (*Feed, error) {
+func (c *Client) CreateFeed(url string, categoryID int64) (int64, error) {
 	body, err := c.request.Post("/v1/feeds", map[string]interface{}{
 		"feed_url":    url,
 		"category_id": categoryID,
 	})
 	if err != nil {
-		return nil, err
+		return 0, err
 	}
 	defer body.Close()
 
-	var feed *Feed
-	decoder := json.NewDecoder(body)
-	if err := decoder.Decode(&feed); err != nil {
-		return nil, fmt.Errorf("miniflux: response error (%v)", err)
+	type result struct {
+		FeedID int64 `json:"feed_id"`
 	}
 
-	return feed, nil
+	var r result
+	decoder := json.NewDecoder(body)
+	if err := decoder.Decode(&r); err != nil {
+		return 0, fmt.Errorf("miniflux: response error (%v)", err)
+	}
+
+	return r.FeedID, nil
 }
 
 // UpdateFeed updates a feed.