Add integration test for export API endpoint

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

@@ -40,6 +40,21 @@ func main() {
         return
     }
     fmt.Println(feeds)
+
+    // Backup to opml file.
+    opml, err := client.Export()
+    if err != nil {
+        fmt.Println(err)
+        return
+    }
+
+    err = ioutil.WriteFile("opml.xml", opml, 0644)
+    if err != nil {
+        fmt.Println(err)
+        return
+    }
+    fmt.Println("backup done!")
+
 }
 ```
 

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

@@ -7,6 +7,7 @@ package miniflux
 import (
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"net/url"
 	"strconv"
 )
@@ -213,6 +214,22 @@ func (c *Client) Feeds() (Feeds, error) {
 	return feeds, nil
 }
 
+// Export creates OPML file.
+func (c *Client) Export() ([]byte, error) {
+	body, err := c.request.Get("/v1/export")
+	if err != nil {
+		return nil, err
+	}
+	defer body.Close()
+
+	opml, err := ioutil.ReadAll(body)
+	if err != nil {
+		return nil, err
+	}
+
+	return opml, nil
+}
+
 // Feed gets a feed.
 func (c *Client) Feed(feedID int64) (*Feed, error) {
 	body, err := c.request.Get(fmt.Sprintf("/v1/feeds/%d", feedID))

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

@@ -18,14 +18,16 @@ const (
 
 // User represents a user in the system.
 type User struct {
-	ID          int64      `json:"id"`
-	Username    string     `json:"username"`
-	Password    string     `json:"password,omitempty"`
-	IsAdmin     bool       `json:"is_admin"`
-	Theme       string     `json:"theme"`
-	Language    string     `json:"language"`
-	Timezone    string     `json:"timezone"`
-	LastLoginAt *time.Time `json:"last_login_at"`
+	ID             int64             `json:"id"`
+	Username       string            `json:"username"`
+	Password       string            `json:"password,omitempty"`
+	IsAdmin        bool              `json:"is_admin"`
+	Theme          string            `json:"theme"`
+	Language       string            `json:"language"`
+	Timezone       string            `json:"timezone"`
+	EntryDirection string            `json:"entry_sorting_direction"`
+	LastLoginAt    *time.Time        `json:"last_login_at"`
+	Extra          map[string]string `json:"extra"`
 }
 
 func (u User) String() string {