Add LeaveRoom(roomID) with test

client.go

@@ -185,7 +185,7 @@ func (cli *Client) SendJSON(method string, httpURL string, contentJSON interface
 	if res.StatusCode >= 300 || res.StatusCode < 200 {
 		var wrap error
 		var respErr RespError
-		if _ = json.Unmarshal(contents, respErr); respErr.ErrCode != "" {
+		if _ = json.Unmarshal(contents, &respErr); respErr.ErrCode != "" {
 			wrap = respErr
 		}
 
@@ -315,6 +315,20 @@ func (cli *Client) SendText(roomID, text string) (*RespSendEvent, error) {
 		TextMessage{"m.text", text})
 }
 
+// LeaveRoom leaves the given room. See http://matrix.org/docs/spec/client_server/r0.2.0.html#post-matrix-client-r0-rooms-roomid-leave
+func (cli *Client) LeaveRoom(roomID string) (*RespLeaveRoom, error) {
+	u := cli.BuildURL("rooms", roomID, "leave")
+	resBytes, err := cli.SendJSON("POST", u, struct{}{})
+	if err != nil {
+		return nil, err
+	}
+	var resp RespLeaveRoom
+	if err = json.Unmarshal(resBytes, &resp); err != nil {
+		return nil, err
+	}
+	return &resp, nil
+}
+
 // UploadLink uploads an HTTP URL and then returns an MXC URI.
 func (cli *Client) UploadLink(link string) (*RespMediaUpload, error) {
 	res, err := cli.Client.Get(link)

client_test.go

@@ -1,6 +1,12 @@
 package gomatrix
 
-import "fmt"
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"testing"
+)
 
 func ExampleClient_BuildURLWithQuery() {
 	cli, _ := NewClient("https://matrix.org", "@example:matrix.org", "abcdef123456")
@@ -26,3 +32,39 @@ func ExampleClient_BuildBaseURL() {
 	fmt.Println(out)
 	// Output: https://matrix.org/_matrix/client/r0/directory/room/%23matrix:matrix.org?access_token=abcdef123456
 }
+
+func TestClient_LeaveRoom(t *testing.T) {
+	cli := mockClient(func(req *http.Request) (*http.Response, error) {
+		if req.Method == "POST" && req.URL.Path == "/_matrix/client/r0/rooms/!foo:bar/leave" {
+			return &http.Response{
+				StatusCode: 200,
+				Body:       ioutil.NopCloser(bytes.NewBufferString(`{}`)),
+			}, nil
+		}
+		return nil, fmt.Errorf("unhandled URL: %s", req.URL.Path)
+	})
+
+	if _, err := cli.LeaveRoom("!foo:bar"); err != nil {
+		t.Fatalf("LeaveRoom: error, got %s", err.Error())
+	}
+}
+
+func mockClient(fn func(*http.Request) (*http.Response, error)) *Client {
+	mrt := MockRoundTripper{
+		RT: fn,
+	}
+
+	cli, _ := NewClient("https://test.gomatrix.org", "@user:test.gomatrix.org", "abcdef")
+	cli.Client = &http.Client{
+		Transport: mrt,
+	}
+	return cli
+}
+
+type MockRoundTripper struct {
+	RT func(*http.Request) (*http.Response, error)
+}
+
+func (t MockRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
+	return t.RT(req)
+}

responses.go

@@ -22,6 +22,9 @@ type RespJoinRoom struct {
 	RoomID string `json:"room_id"`
 }
 
+// RespLeaveRoom is the JSON response for http://matrix.org/docs/spec/client_server/r0.2.0.html#post-matrix-client-r0-rooms-roomid-leave
+type RespLeaveRoom struct{}
+
 // RespSendEvent is the JSON response for http://matrix.org/docs/spec/client_server/r0.2.0.html#put-matrix-client-r0-rooms-roomid-send-eventtype-txnid
 type RespSendEvent struct {
 	EventID string `json:"event_id"`