public async void CreateOneAsync_ReturnsNull_WhenRepositoryReturnsNull()
        {
            // Arrange
            var muscleToCreate = TestData.Activations.ActivationWithoutId;

            ActivationsRepositoryMock
            .Setup(x => x.CreateOneAsync(It.IsAny <Activation>()))
            .ReturnsAsync((Activation)null);

            // Act
            var result = await ActivationsService.CreateOneAsync(muscleToCreate);

            // Assert
            Assert.Null(result);
        }
        public async void CreateOneAsync_ReturnsCreatedActivation_WhenServiceReturnsActivation()
        {
            // Arrange
            var muscleToCreate    = TestData.Activations.ActivationWithoutId;
            var createdActivation = TestData.Activations.ActivationWithoutId;

            createdActivation.Id = "1234";
            ActivationsRepositoryMock
            .Setup(x => x.CreateOneAsync(It.IsAny <Activation>()))
            .ReturnsAsync(createdActivation);

            // Act
            var result = await ActivationsService.CreateOneAsync(muscleToCreate);

            // Assert
            Assert.Same(createdActivation, result);
        }