[英]How to write unit test case for SaveChangesAsync()
我正在為我的 Entity Framework Core SaveAsync
方法編寫單元測試用例。
try
{
// Here add business logic to insert record in to new database
var dbObj = new TableName()
{
Code = 1,
Description = "test"
};
_ = _dbContext.TableName.AddAsync(dbObj);
_ = _dbContext.SaveChangesAsync(context.CancellationToken);
}
catch (Exception ex)
{
_logger.LogCritical($"{GetType().Name}:{nameof(Consume)} {ex}");
}
await Task.CompletedTask;
我已經通過 mocking 編寫了單元測試用例:
Mock<MyDbContext> dbContext = new();
var data = return new List<TableName>()
{
new TableName
{
Id = 1,
Description = "test"
}
};
dbContext.Setup(r => r.TableName).ReturnsDbSet(data);
dbContext.Setup(r => r.SaveChangesAsync(It.IsAny<CancellationToken>())).ReturnsAsync(1);
// Check that each method was only called once.
//dbContext.Verify(x => x.TableName.Add(It.IsAny<TableName>()), Times.Once());
dbContext.Verify(x => x.SaveChangesAsync(It.IsAny<CancellationToken>()), Times.Once());
以下是我得到的結果
Moq.MockException:預期對模擬調用一次,但為 0 次
在調試測試用例時,我得到以下信息。
首先在try catch塊中加入await,否則不會catch excption
try
{
// Here add business logic to insert record in to new database
var dbObj = new TableName()
{
Code = 1,
Description = "test"
};
_ = await _dbContext.TableName.AddAsync(dbObj);
_ = await _dbContext.SaveChangesAsync(context.CancellationToken);
}
//remove this line
await Task.CompletedTask;
異步編程相關文檔
你可以查看與測試非查詢場景相關的文檔
我嘗試如下:
假設一個 controller:
public async Task<IActionResult> Create([Bind("Id,Name")] SomeEntity someEntity)
{
if (ModelState.IsValid)
{
try
{
await _context.AddAsync(someEntity);
await _context.SaveChangesAsync();
}
catch (Exception e)
{
}
return RedirectToAction(nameof(Index));
}
return View(someEntity);
}
測試:
public class UnitTest1
{
[Fact]
public async Task Test1()
{
var mockset = new Mock<DbSet<SomeEntity>>();
var mockdbcontext = new Mock<WebApplication8Context>(new DbContextOptions<WebApplication8Context>() );
mockdbcontext.Setup(x=>x.SomeEntity).Returns(mockset.Object);
var a = mockdbcontext.Object;
var controller = new SomeEntitiesController(mockdbcontext.Object);
await controller.Create(new SomeEntity() { Name = "someName" });
mockdbcontext.Verify(x => x.SaveChangesAsync(default(CancellationToken)), Times.Once);
}
}
結果:
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