feat: swappable http client (#173)

Author: peterdeme

client.go

@@ -91,6 +91,11 @@ func NewClient(apiKey, apiSecret string) (*Client, error) {
 	return client, nil
 }
 
+// SetClient sets a new underlying HTTP client.
+func (c *Client) SetClient(client *http.Client) {
+	c.HTTP = client
+}
+
 // Channel returns a Channel object for future API calls.
 func (c *Client) Channel(channelType, channelID string) *Channel {
 	return &Channel{

client_test.go

@@ -2,6 +2,8 @@ package stream_chat
 
 import (
 	"context"
+	"net/http"
+	"net/url"
 	"testing"
 	"time"
 
@@ -25,6 +27,24 @@ func initChannel(t *testing.T, c *Client, membersID ...string) *Channel {
 	return resp.Channel
 }
 
+func TestClient_SwapHttpClient(t *testing.T) {
+	c := initClient(t)
+	ctx := context.Background()
+
+	tr := http.DefaultTransport.(*http.Transport).Clone() //nolint:forcetypeassert
+	proxyURL, _ := url.Parse("http://getstream.io")
+	tr.Proxy = http.ProxyURL(proxyURL)
+	cl := &http.Client{Transport: tr}
+	c.SetClient(cl)
+	_, err := c.GetAppConfig(ctx)
+	require.Error(t, err)
+
+	cl = &http.Client{}
+	c.SetClient(cl)
+	_, err = c.GetAppConfig(ctx)
+	require.NoError(t, err)
+}
+
 //nolint: lll
 func TestClient_CreateToken(t *testing.T) {
 	type args struct {