Assert

In this section we verify that the unit of code, effectively, produces the expected result for the simulated situation.

Only one exit point must be verified for each unit test and it's that exit point this section is focused on.

test("the airplane state should be FLYING after takeoff", () => {
  /// Arrange
  const fakeEngine: IEngine = new FakeEngine();
  const fakeFuelTank: ITank = new FakeTank();
  const airplane: Airplane = new Airplane(fakeEngine, fakeFuelTank);

  /// Act
  airplane.takeoff();

  /**
   * Notice that we clearly mark the Assert section
   * and we compare the test actual result with
   * the expected result
   */

  /// Assert
  assert(airplane.currentStatus, AirplaneStatus.FLYING);
});

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