Update client and add a new option

client.go

@@ -10,14 +10,14 @@ import (
 type (
 	// Client is a struct who has BaseUrl property
 	Client struct {
-		baseUrl string
-		headers map[string]Header
-		query   map[string]string
-		body    []byte
-		timeout time.Duration
-
-		httpClient  *http.Client
-		defaultOpts []ClientOption
+		baseUrl    string
+		httpClient *http.Client
+
+		headers   map[string]Header
+		query     map[string]string
+		body      []byte
+		transport *http.Transport
+		timeout   time.Duration
 	}
 
 	// Clienter is a interface who calls the methods

option.go

@@ -1,12 +1,21 @@
 package gohttpclient
 
-import "time"
+import (
+	"net/http"
+	"time"
+)
 
 type (
 	Option       func(c *Client)
 	ClientOption Option
 )
 
+func WithCustomHttpClient(client *http.Client) ClientOption {
+	return func(c *Client) {
+		c.httpClient = client
+	}
+}
+
 func WithDefaultHeaders() ClientOption {
 	return func(c *Client) {
 		if c.headers == nil {

option_test.go

@@ -2,6 +2,7 @@ package gohttpclient
 
 import (
 	"context"
+	"net/http"
 	"testing"
 	"time"
 
@@ -21,6 +22,20 @@ func (s *TestOptionSuite) SetupSuite() {
 	s.ctx = context.Background()
 }
 
+func (s *TestOptionSuite) Test_WithCustomHttpClient_ShouldRunSuccesfully() {
+	// Arrange
+	baseUrl := "http://localhost:8080"
+	httpClient := &http.Client{}
+	client := New(baseUrl)
+
+	// Act
+	WithCustomHttpClient(httpClient)(client)
+
+	// Assert
+	s.Assert().NotNil(client.httpClient)
+	s.Assert().Equal(httpClient, client.httpClient)
+}
+
 func (s *TestOptionSuite) Test_WithDefaultHeaders_ShouldRunSuccesfully() {
 	// Arrange
 	baseUrl := "http://localhost:8080"