First implementation of fetching collections of book managed by user

internal/testutils/testutils.go

@@ -6,6 +6,8 @@ import (
 	"log"
 	"net/http"
 	"net/http/httptest"
+
+	"net/url"
 	"strings"
 	"testing"
 
@@ -65,3 +67,40 @@ func TestBookPutCallWithDemoPayload(t *testing.T, payload string, bookId string,
 		t.Errorf("%s", w.Body.String())
 	}
 }
+
+func TestFetchModel[T any](t *testing.T, urlpath string, limit string, offset string) (int, T) {
+	router := TestSetup()
+
+	u, err := url.Parse(urlpath)
+	if err != nil {
+		t.Error(err)
+	}
+	if limit != "" {
+		q := u.Query()
+		q.Set("limit", limit)
+		u.RawQuery = q.Encode()
+	}
+	if offset != "" {
+		q := u.Query()
+		q.Set("offset", offset)
+		u.RawQuery = q.Encode()
+	}
+
+	q := u.Query()
+	q.Set("lang", "fr")
+	u.RawQuery = q.Encode()
+
+	token := ConnectDemoUser(router)
+	req, _ := http.NewRequest("GET", u.String(), nil)
+	req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", token))
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	var result T
+	s := w.Body.String()
+	err = json.Unmarshal([]byte(s), &result)
+	if err != nil {
+		t.Error(err)
+	}
+	return w.Code, result
+}