public void Update_CorrectInput_ReturnIdOfUpdatedDisease()
{
// Arrange
TestData testData = new TestData();
int expectedUpdatedDiseaseId = testData.disease.DiseaseId;
var mockDataProvider = new Mock <IDataAccessManager>();
mockDataProvider.Setup(mock => mock.GetDisease(testData.disease.DiseaseId)).Returns(testData.disease);
mockDataProvider.Setup(mock => mock.GetDiseaseCategories()).Returns(testData.Categories);
mockDataProvider.Setup(mock => mock.GetDiseasesInCategory(It.IsAny <int>())).Returns(testData.Diseases);
mockDataProvider.Setup(mock => mock.UpdateDisease(expectedUpdatedDiseaseId, testData.disease)).
Returns(expectedUpdatedDiseaseId);
var service = new DiseaseManager(mockDataProvider.Object);
// Act
int actualUpdatedDiseaseId = service.Update(expectedUpdatedDiseaseId, testData.disease);
// Assert
Assert.AreEqual(expectedUpdatedDiseaseId, actualUpdatedDiseaseId);
}