diff --git a/src/main/java/eirb/pg203/City.java b/src/main/java/eirb/pg203/City.java
index 40f3158..e89e682 100644
--- a/src/main/java/eirb/pg203/City.java
+++ b/src/main/java/eirb/pg203/City.java
@@ -9,6 +9,7 @@ import java.net.URL;
 import java.util.Locale;
 
 import eirb.pg203.utils.JSONFetcher;
+import eirb.pg203.utils.JSONFetcherInterface;
 import org.json.JSONArray;
 import org.json.JSONObject;
 
@@ -21,6 +22,7 @@ import eirb.pg203.utils.Coords;
 public class City {
 	private String cityName;
 	private Coords cityCoords;
+	private static final JSONFetcherInterface JSONFetcher = new JSONFetcher();
 
 	/**
 	 * Fetch data from adresse.data.gouv.fr
diff --git a/src/main/java/eirb/pg203/OpenMeteo.java b/src/main/java/eirb/pg203/OpenMeteo.java
index bbe5b00..dab51de 100644
--- a/src/main/java/eirb/pg203/OpenMeteo.java
+++ b/src/main/java/eirb/pg203/OpenMeteo.java
@@ -1,5 +1,6 @@
 package eirb.pg203;
 
+import eirb.pg203.utils.JSONFetcherInterface;
 import org.json.JSONArray;
 import org.json.JSONObject;
 
@@ -22,6 +23,7 @@ import eirb.pg203.WeatherData.Condition;
 public class OpenMeteo implements WeatherDataAPI {
 	private static final String forecastBaseURL = "https://api.open-meteo.com/v1/forecast";
 	private static final String dailyQuery = "weather_code,temperature_2m_max,temperature_2m_min,wind_speed_10m_max,wind_direction_10m_dominant";
+	private static final JSONFetcherInterface JSONFetcher = new JSONFetcher();
 
 	/**
 	 * Default constructor
diff --git a/src/main/java/eirb/pg203/OpenWeatherMap.java b/src/main/java/eirb/pg203/OpenWeatherMap.java
index c79ffa4..9a54da3 100644
--- a/src/main/java/eirb/pg203/OpenWeatherMap.java
+++ b/src/main/java/eirb/pg203/OpenWeatherMap.java
@@ -1,5 +1,6 @@
 package eirb.pg203;
 
+import eirb.pg203.utils.JSONFetcherInterface;
 import org.json.JSONObject;
 import org.json.JSONArray;
 
@@ -22,6 +23,7 @@ import eirb.pg203.WeatherData.Condition;
 public class OpenWeatherMap implements WeatherDataAPI {
 	private static final String forecastBaseURL = "https://api.openweathermap.org/data/2.5/forecast";
 	private String APIKey;
+	private static final JSONFetcherInterface JSONFetcher = new JSONFetcher();
 
 	OpenWeatherMap(String APIKey) {
 		this.APIKey = APIKey;
diff --git a/src/main/java/eirb/pg203/WeatherAPI.java b/src/main/java/eirb/pg203/WeatherAPI.java
index 383a55c..9abd91e 100644
--- a/src/main/java/eirb/pg203/WeatherAPI.java
+++ b/src/main/java/eirb/pg203/WeatherAPI.java
@@ -1,5 +1,6 @@
 package eirb.pg203;
 
+import eirb.pg203.utils.JSONFetcherInterface;
 import org.json.JSONArray;
 import org.json.JSONObject;
 
@@ -18,7 +19,8 @@ import java.util.Locale;
  */
 public class WeatherAPI implements WeatherDataAPI{
     private final String weatherAPIKey;
-		private static final String forecastBaseURL = "https://api.weatherapi.com/v1/forecast.json";
+    private static final JSONFetcherInterface JSONFetcher = new JSONFetcher();
+    private static final String forecastBaseURL = "https://api.weatherapi.com/v1/forecast.json";
 
     WeatherAPI(String weatherAPIKey) {
         this.weatherAPIKey = weatherAPIKey;
diff --git a/src/main/java/eirb/pg203/utils/JSONFetcher.java b/src/main/java/eirb/pg203/utils/JSONFetcher.java
index 079a0b8..16484a9 100644
--- a/src/main/java/eirb/pg203/utils/JSONFetcher.java
+++ b/src/main/java/eirb/pg203/utils/JSONFetcher.java
@@ -12,12 +12,12 @@ import org.json.JSONObject;
 /**
  * Util for http calls
  */
-public class JSONFetcher {
+public class JSONFetcher implements JSONFetcherInterface{
 
   /**
    * No need for constructor
    */
-  private JSONFetcher() {};
+  public JSONFetcher() {};
   /**
    * Make the request
    * @param url url to fetch
@@ -44,7 +44,8 @@ public class JSONFetcher {
    * @return Json object of the response
    * @throws IOException if the request failed
    */
-  public static JSONObject fetch(URL url) throws IOException {
+  @Override
+  public JSONObject fetch(URL url) throws IOException {
     String result =  fetchString(url);
 
     return new JSONObject(result);
@@ -56,7 +57,8 @@ public class JSONFetcher {
    * @return JSON array
    * @throws IOException when request failed
    */
-  public static JSONArray fetchArray(URL url) throws IOException {
+  @Override
+  public JSONArray fetchArray(URL url) throws IOException {
     String result =  fetchString(url);
 
     return new JSONArray(result);
diff --git a/src/main/java/eirb/pg203/utils/JSONFetcherInterface.java b/src/main/java/eirb/pg203/utils/JSONFetcherInterface.java
new file mode 100644
index 0000000..0adbd33
--- /dev/null
+++ b/src/main/java/eirb/pg203/utils/JSONFetcherInterface.java
@@ -0,0 +1,16 @@
+package eirb.pg203.utils;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+import java.io.IOException;
+import java.net.URL;
+
+/**
+ * Interface use to be overrided by a fake jsonFetcher during tests
+ */
+public interface JSONFetcherInterface {
+    JSONObject fetch(URL url) throws IOException;
+
+    JSONArray fetchArray(URL url) throws IOException;
+}