Jest – Test Suite Failed to Run “x.default is not a constructor”

Two of my jest test suites are failing to run, I receive the errors “_player.default is not a constructor” and “_gameboard.default is not a constructor”.

I have a player class that I want to test:

export default class Player {
 constructor(name) {
  this.name = name;
  this.isTurn = false;
  this.isConsideringAttack = false;
  this.gameboard = new Gameboard();
  }
 }

And a gameboard class:

export default class Gameboard {
 constructor() {
  this.board = [];
  this.initialiseBoard();
  }
 }

The error I receive when I try to run the player test suite:

  ● Test suite failed to run

TypeError: _player.default is not a constructor

  3 |
  4 | const players = {
> 5 |   user: new Player('user'),
    |         ^
  6 |   computer: new Player('computer'),
  7 | };
  8 |

  at Object.<anonymous> (src/game.js:5:9)
  at Object.<anonymous> (src/dragAndDrop.js:2:1)

The error I receive when I try to run the gameboard test suite:

  ● Test suite failed to run

TypeError: _gameboard.default is not a constructor

   7 |     this.isTurn = false;
   8 |     this.isConsideringAttack = false;
>  9 |     this.gameboard = new Gameboard();
     |                      ^
  10 |   }
  11 |
  12 |   attack(x, y, gameboard) {

  at new Player (src/factories/player.js:9:22)
  at Object.<anonymous> (src/game.js:5:9)
  at Object.<anonymous> (src/dragAndDrop.js:2:1)

I’m very new to Jest, I couldn’t find a fix for this despite spending a few hours searching. Any help would be appreciated.