public async void DeleteOneAsync_ReturnsNull_WhenRepositoryReturnsNull()
        {
            // Arrange
            ActivationsRepositoryMock
            .Setup(x => x.DeleteOneAsync(It.IsAny <string>()))
            .ReturnsAsync((Activation)null);

            // Act
            var result = await ActivationsService.DeleteOneAsync("123021");

            // Assert
            Assert.Null(result);
        }
        public async void DeleteOneAsync_ReturnsActivation_WhenRepositoryReturnsActivation()
        {
            // Arrange
            var deletedActivation = TestData.Activations.ContractActivation;

            ActivationsRepositoryMock
            .Setup(x => x.DeleteOneAsync(It.IsAny <string>()))
            .ReturnsAsync(deletedActivation);

            // Act
            var result = await ActivationsService.DeleteOneAsync("123021");

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