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

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

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

            ActivationsRepositoryMock
            .Setup(x => x.ReadOneAsync(It.IsAny <string>()))
            .ReturnsAsync(expectedActivation);

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

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