public void AddCategory_ShouldThrowArgumentNullException_WhenCategoryIsNull()
{
// Arrange
// Act
using (var context = new AppDbContext(_dbContextOptions))
{
var service = new CategoriesDataService(context);
Func <Task> action = async() => await service.AddCategory(null);
// Assert
action.Should().Throw <ArgumentNullException>();
}
}
public async Task AddCategory_ShouldReturnAddedCategory_WhenCategorySaved()
{
// Arrange
const string expectedCategoryName = "name";
// Act
using (var context = new AppDbContext(_dbContextOptions))
{
var service = new CategoriesDataService(context);
var result = await service.AddCategory(new Category { Name = expectedCategoryName });
// Assert
result.Name.Should().Be(expectedCategoryName);
}
}
public async Task AddCategory_ShouldBlankCategoryId_WhenCategoryIdProvided()
{
// Arrange
const int categoryId = 999;
// Act
using (var context = new AppDbContext(_dbContextOptions))
{
var service = new CategoriesDataService(context);
var result = await service.AddCategory(new Category { CategoryId = categoryId });
// Assert
result.CategoryId.Should().NotBe(categoryId);
}
}
public void CreateCategory_WithValidCategory_ShouldSaveAndReturnId()
{
// Arrange
var category = new Category
{
Name = "Test Category"
};
using var dbContext = GetDbContext();
var service = new CategoriesDataService(dbContext);
// Act
var result = service.CreateCategory(category);
// Assert
Assert.AreNotEqual(default, result, FailureMessages.ResultNotExpectedValue);
public async Task GetCategories_ShouldReturnTwoCategories_WhenTwoCategoriesInDatabase()
{
// Arrange
using (var context = new AppDbContext(_dbContextOptions))
{
context.Categories.AddRange(new Category(), new Category());
await context.SaveChangesAsync();
}
// Act
using (var context = new AppDbContext(_dbContextOptions))
{
var service = new CategoriesDataService(context);
var result = await service.GetCategories();
// Assert
result.Should().HaveCount(2);
}
}
public void CreateCategory_WithNullCategory_ShouldThrowException()
{
// Arrange
using var dbContext = GetDbContext();
var service = new CategoriesDataService(dbContext);
Exception caughtException = null;
// Act
try
{
service.CreateCategory(null);
}
catch (Exception exception)
{
caughtException = exception;
}
// Assert
Assert.IsNotNull(caughtException, FailureMessages.ExceptionNotThrown);
Assert.IsInstanceOfType(caughtException, typeof(ArgumentNullException), FailureMessages.ExceptionNotExpectedType);
}
