fix: Move collection index validation logic to a context assert function (#2116)

* Abstract validation logic for readability

* Add index validation in collections.move

* Add tests

server/api/collections.test.js

@@ -162,6 +162,15 @@ describe("#collections.move", () => {
     expect(body.success).toBe(true);
   });
 
+  it("should return error when index is not valid", async () => {
+    const { admin, collection } = await seed();
+    const res = await server.post("/api/collections.move", {
+      body: { token: admin.getJwtToken(), id: collection.id, index: "يونيكود" },
+    });
+
+    expect(res.status).toEqual(400);
+  });
+
   it("if index collision occurs, should updated index of other collection", async () => {
     const { user, admin, collection } = await seed();
     const createdCollectionResponse = await server.post(
@@ -1019,6 +1028,14 @@ describe("#collections.create", () => {
     expect(body.policies[0].abilities.export).toBeTruthy();
   });
 
+  it("should error when index is invalid", async () => {
+    const user = await buildUser();
+    const res = await server.post("/api/collections.create", {
+      body: { token: user.getJwtToken(), name: "Test", index: "يونيكود" },
+    });
+    expect(res.status).toEqual(400);
+  });
+
   it("should allow setting sharing to false", async () => {
     const { user } = await seed();
     const res = await server.post("/api/collections.create", {