test that validation is called after the migrations finish

app/store/migrations/index.test.ts

@@ -71,6 +71,37 @@ describe('asyncifyMigrations', () => {
 
     expect(isPromiseMigrations).toEqual(true);
   });
+
+  it('should only call validation callback after all migrations complete', async () => {
+    const mockValidation = jest.fn();
+    const testMigrationList = {
+      0: synchronousMigration,
+      1: asyncMigration,
+      2: synchronousMigration,
+    };
+
+    // Convert all migrations to async with validation callback
+    const asyncMigrations = asyncifyMigrations(
+      testMigrationList,
+      mockValidation,
+    );
+
+    // Run migrations in sequence and verify validation is only called after the highest migration
+    let state: PersistedState = initialState;
+
+    for (const migrationKey in asyncMigrations) {
+      state = (await asyncMigrations[migrationKey](state)) as PersistedState;
+
+      if (Number(migrationKey) === 2) {
+        // Should be called exactly once after the last migration
+        expect(mockValidation).toHaveBeenCalledTimes(1);
+        expect(mockValidation).toHaveBeenCalledWith(state);
+      } else {
+        // Should not be called for any other migration
+        expect(mockValidation).not.toHaveBeenCalled();
+      }
+    }
+  });
 });
 
 describe('migrations', () => {