first try of a test, doesn't work yet

src/Resources/src/api/getParticipationsByDay.ts

@@ -10,7 +10,7 @@ const listDataState = ref([])
  * @param date
  * @returns list of participants
  */
-export function useParticipationsListData(date: string){
+export default function useParticipationsListData(date: string){
 
     const loaded = ref(false)
 

src/Resources/tests/unit/api/getParticipationsByDate.spec.ts

@@ -0,0 +1,28 @@
+import useApi from "@/api/api";
+import Participations from "../fixtures/participationsByDate.json";
+import useParticipationsListData from "@/api/getParticipationsByDay";
+import { ref } from "vue";
+
+const asyncFunc: () => Promise<void> = async () => {
+    new Promise(resolve => resolve(undefined));
+};
+
+const mockedReturnValue = {
+    response: ref(Participations),
+    request: asyncFunc,
+    error: ref(false)
+}
+
+// @ts-expect-error ts doesn't like mocking with jest.fn()
+useApi = jest.fn(useApi);
+// @ts-expect-error continuation of expect error from line above
+useApi.mockReturnValue(mockedReturnValue);
+
+describe('Test getParticipations', () => {
+    it('should return a list of participations', async () => {
+        const { listData } = useParticipationsListData("16/01/2024");
+
+        // expect(error.value).toBeFalsy();
+        expect(listData).toEqual(Participations);
+    });
+});

src/Resources/tests/unit/fixtures/participationsByDate.json

@@ -0,0 +1,10 @@
+[
+  "Alice Meals",
+  "Bob Meals",
+  "John Meals",
+  "Admin Meals",
+  "Finance Meals",
+  "Kochomi Meals",
+  "Jane Meals"
+]
+