public void Get_InCorrectInputDiseaseId_ReturnNull()
{
// Arrange
TestData testData = new TestData();
var mockDataProvider = new Mock <IDataAccessManager>();
mockDataProvider.Setup(mock => mock.GetDisease(testData.disease.DiseaseId)).Returns(testData.disease);
var service = new DiseaseManager(mockDataProvider.Object);
// Act
Disease disease = service.Get(testData.disease.DiseaseId + 1);
// Assert
Assert.IsNull(disease);
}