diff --git a/__test__/components/Calendar.test.tsx b/__test__/components/Calendar.test.tsx
new file mode 100644
index 0000000..3872439
--- /dev/null
+++ b/__test__/components/Calendar.test.tsx
@@ -0,0 +1,150 @@
+import { fireEvent, screen, waitFor } from "@testing-library/react";
+import CalendarApp from "../../src/components/Calendar/Calendar";
+import * as eventThunks from "../../src/features/Calendars/CalendarSlice";
+import { renderWithProviders } from "../utils/Renderwithproviders";
+
+describe("CalendarSelection", () => {
+  const today = new Date();
+  const start = new Date(today);
+  start.setHours(10, 0, 0, 0);
+  const end = new Date(today);
+  end.setHours(11, 0, 0, 0);
+  const preloadedState = {
+    user: {
+      userData: {
+        sub: "test",
+        email: "test@test.com",
+        sid: "mockSid",
+        openpaasId: "user1",
+      },
+      tokens: { accessToken: "token" }, // required to avoid redirect
+    },
+    calendars: {
+      list: {
+        "user1/cal1": {
+          name: "Calendar personnal",
+          id: "user1/cal1",
+          color: "#FF0000",
+          ownerEmails: ["alice@example.com"],
+          events: {
+            event1: {
+              id: "event1",
+              calId: "user1/cal1",
+              uid: "event1",
+              title: "Test Event",
+              start: start.toISOString(),
+              end: end.toISOString(),
+              partstat: "ACCEPTED",
+              organizer: {
+                cn: "Alice",
+                cal_address: "alice@example.com",
+              },
+              attendee: [
+                {
+                  cn: "Alice",
+                  partstat: "ACCEPTED",
+                  rsvp: "TRUE",
+                  role: "REQ-PARTICIPANT",
+                  cutype: "INDIVIDUAL",
+                  cal_address: "alice@example.com",
+                },
+              ],
+            },
+          },
+        },
+        "user2/cal1": {
+          name: "Calendar delegated",
+          delegated: true,
+          id: "user2/cal1",
+          color: "#FF0000",
+          ownerEmails: ["alice@example.com"],
+          events: {
+            event1: {
+              id: "event1",
+              calId: "user2/cal1",
+              uid: "event1",
+              title: "Test Event",
+              start: start.toISOString(),
+              end: end.toISOString(),
+              partstat: "ACCEPTED",
+              organizer: {
+                cn: "Alice",
+                cal_address: "alice@example.com",
+              },
+              attendee: [
+                {
+                  cn: "Alice",
+                  partstat: "ACCEPTED",
+                  rsvp: "TRUE",
+                  role: "REQ-PARTICIPANT",
+                  cutype: "INDIVIDUAL",
+                  cal_address: "alice@example.com",
+                },
+              ],
+            },
+          },
+        },
+        "user3/cal1": {
+          name: "Calendar shared",
+          id: "user3/cal1",
+          color: "#FF0000",
+          ownerEmails: ["alice@example.com"],
+          events: {
+            event1: {
+              id: "event1",
+              calId: "user3/cal1",
+              uid: "event1",
+              title: "Test Event",
+              start: start.toISOString(),
+              end: end.toISOString(),
+              partstat: "ACCEPTED",
+              organizer: {
+                cn: "Alice",
+                cal_address: "alice@example.com",
+              },
+              attendee: [
+                {
+                  cn: "Alice",
+                  partstat: "ACCEPTED",
+                  rsvp: "TRUE",
+                  role: "REQ-PARTICIPANT",
+                  cutype: "INDIVIDUAL",
+                  cal_address: "alice@example.com",
+                },
+              ],
+            },
+          },
+        },
+      },
+      pending: false,
+    },
+  };
+  it("renders calendars", async () => {
+    renderWithProviders(<CalendarApp />, preloadedState);
+    expect(screen.getByText("Personnal Calendars")).toBeInTheDocument();
+    expect(screen.getByText("Delegated Calendars")).toBeInTheDocument();
+    expect(screen.getByText("Shared Calendars")).toBeInTheDocument();
+
+    expect(screen.getByLabelText("Calendar personnal")).toBeInTheDocument();
+    expect(screen.getByLabelText("Calendar delegated")).toBeInTheDocument();
+    expect(screen.getByLabelText("Calendar shared")).toBeInTheDocument();
+  });
+  it("refresh calendars", async () => {
+    const spy = jest
+      .spyOn(eventThunks, "getCalendarDetailAsync")
+      .mockImplementation((payload) => {
+        return () => Promise.resolve(payload) as any;
+      });
+    renderWithProviders(<CalendarApp />, preloadedState);
+
+    const refreshButton = screen.getByRole("button", {
+      name: "↻",
+    });
+
+    fireEvent.click(refreshButton);
+
+    await waitFor(() => {
+      expect(spy).toHaveBeenCalled();
+    });
+  });
+});
diff --git a/src/components/Calendar/Calendar.tsx b/src/components/Calendar/Calendar.tsx
index 4b8121b..7011f89 100644
--- a/src/components/Calendar/Calendar.tsx
+++ b/src/components/Calendar/Calendar.tsx
@@ -268,6 +268,28 @@ export default function CalendarApp() {
           height={"100%"}
           select={handleDateSelect}
           nowIndicator
+          customButtons={{
+            refresh: {
+              text: "↻",
+              click: () => {
+                selectedCalendars.forEach((id) => {
+                  if (!pending && rangeKey) {
+                    dispatch(
+                      getCalendarDetailAsync({
+                        calId: id,
+                        match: {
+                          start: formatDateToYYYYMMDDTHHMMSS(
+                            calendarRange.start
+                          ),
+                          end: formatDateToYYYYMMDDTHHMMSS(calendarRange.end),
+                        },
+                      })
+                    );
+                  }
+                });
+              },
+            },
+          }}
           views={{
             timeGridWeek: { titleFormat: { month: "long", year: "numeric" } },
           }}
@@ -401,7 +423,7 @@ export default function CalendarApp() {
           headerToolbar={{
             left: "title",
             center: "prev,today,next",
-            right: "dayGridMonth,timeGridWeek,timeGridDay",
+            right: "refresh,dayGridMonth,timeGridWeek,timeGridDay",
           }}
           eventContent={(arg) => {
             const event = arg.event;