Adding unit tests

Services/PlayerService.cs

@@ -18,26 +18,26 @@ public class PlayerService
         _players = db.GetCollection<Player>("Players");
     }
 
-    public async Task<Player> GetByUserIdAsync(string userId) =>
+    public virtual async Task<Player> GetByUserIdAsync(string userId) =>
         await _players.Find(p => p.UserId == userId).FirstOrDefaultAsync();
 
-    public async Task<List<Player>> GetByLocationIdAsync(string locationId)
+    public virtual async Task<List<Player>> GetByLocationIdAsync(string locationId)
     {
         return await _players.Find(p => p.LocationId == locationId).ToListAsync();
     }
 
-    public async Task<Player> GetByIdAsync(string id) =>
+    public virtual async Task<Player> GetByIdAsync(string id) =>
         await _players.Find(p => p.Id == id).FirstOrDefaultAsync();
 
-    public async Task CreateAsync(Player player) =>
+    public virtual async Task CreateAsync(Player player) =>
         await _players.InsertOneAsync(player);
 
-    public async Task UpdateAsync(Player player)
+    public virtual async Task UpdateAsync(Player player)
     {
         await _players.ReplaceOneAsync(p => p.Id == player.Id, player);
     }
 
-    public async Task DeleteAsync(string id)
+    public virtual async Task DeleteAsync(string id)
     {
         await _players.DeleteOneAsync(p => p.Id == id);
     }