unit-testing - 如何使用 Moq.Dapper 模拟 QueryMultiple
问题描述
我正在编写单元测试用例,并且成功地为Query
. 但是我没有为QueryMultiple
.
对于查询,我这样写:
IEnumerable<ClientTestPurpose> fakeTestPurposes = new
List<ClientTestPurpose>()
{
new ClientTestPurpose { PurposeID = 1, PurposeName = "Test Purpose name1"},
new ClientTestPurpose { PurposeID = 1, PurposeName = "Test Purpose name2"},
new ClientTestPurpose { PurposeID = 1, PurposeName = "Test Purpose name3"}
};
_mock.SetupDapper(x => x.Query<ClientTestPurpose>(It.IsAny<string>(), null, null, true, null, null)).Returns(fakeTestPurposes);
var result = _libraryRepository.TestPurposes(clientModal.Id);
Assert.IsNotNull(result);
Assert.AreEqual(result.Count(), fakeTestPurposes.Count());
如何写QueryMultiple
:
using (var multi = _db.QueryMultiple(spName, spParams, commandType: CommandType.StoredProcedure))
{
var totals = multi.Read<dynamic>().FirstOrDefault();
var aggregates = multi.Read<StatusModel>();
var scripts = multi.Read<LibraryItemModel>();
var runs = multi.Read<RunSummaryModel>();
var filteredTotals = multi.Read<dynamic>().FirstOrDefault();
}
解决方案
显然你使用 Moq.Dapper 扩展。这是SetupDapper
和SetupDapperAsync
方法的代码:
public static ISetup<IDbConnection, TResult> SetupDapper<TResult>(this Mock<IDbConnection> mock, Expression<Func<IDbConnection, TResult>> expression)
{
MethodCallExpression body = expression.Body as MethodCallExpression;
if ((body != null ? body.Method.DeclaringType : (Type) null) != typeof (SqlMapper))
throw new ArgumentException("Not a Dapper method.");
string name = body.Method.Name;
if (name == "Execute")
return (ISetup<IDbConnection, TResult>) DbConnectionInterfaceMockExtensions.SetupExecute(mock);
if (name == "ExecuteScalar")
return DbConnectionInterfaceMockExtensions.SetupExecuteScalar<TResult>(mock);
if (name == "Query" || name == "QueryFirstOrDefault")
return DbConnectionInterfaceMockExtensions.SetupQuery<TResult>(mock);
throw new NotSupportedException();
}
public static ISetup<IDbConnection, Task<TResult>> SetupDapperAsync<TResult>(this Mock<IDbConnection> mock, Expression<Func<IDbConnection, Task<TResult>>> expression)
{
MethodCallExpression body = expression.Body as MethodCallExpression;
if ((body != null ? body.Method.DeclaringType : (Type) null) != typeof (SqlMapper))
throw new ArgumentException("Not a Dapper method.");
if (body.Method.Name == "QueryAsync")
return DbConnectionInterfaceMockExtensions.SetupQueryAsync<TResult>(mock);
throw new NotSupportedException();
}
如您所见,Moq.Dapper 仅支持对Execute
、和方法进行模拟。因此,您可能会继续尝试 mock 。正如@TrueWill 在评论中所说,要模拟 DB 行为,您可能需要首先引入另一个抽象级别。这只是一个示例,说明您的情况如何:ExecuteScalar
Query
QueryAsync
NotSupportedException
QueryMultiple
[Test]
public void DoSomethingWithQueryTest()
{
// Arrange
IEnumerable<ClientTestPurpose> fakeTestPurposes = new
List<ClientTestPurpose>
{
new ClientTestPurpose { PurposeID = 1, PurposeName = "Test Purpose name1" },
new ClientTestPurpose { PurposeID = 1, PurposeName = "Test Purpose name2" },
new ClientTestPurpose { PurposeID = 1, PurposeName = "Test Purpose name3" }
};
var mock = new Mock<ILibraryRepository>();
mock.Setup(x => x.TestPurposes(It.IsAny<int>())).Returns(fakeTestPurposes);
var logicService = new SomeLogicService(mock.Object);
// Act
var result = logicService.DoSomethingWithQuery(1);
// Assert
Assert.IsNotNull(result);
Assert.AreEqual(result.Count(), fakeTestPurposes.Count());
}
[Test]
public void DoSomethingWithQueryMultipleTest()
{
// Arrange
SomeAggregate fakeTestPurposes = new SomeAggregate();
var mock = new Mock<ILibraryRepository>();
mock.Setup(x => x.TestQueryMultiple()).Returns(fakeTestPurposes);
var logicService = new SomeLogicService(mock.Object);
// Act
var result = logicService.DoSomethingWithQueryMultiple();
// Assert
Assert.IsNotNull(result);
}
public interface ILibraryRepository
{
IEnumerable<ClientTestPurpose> TestPurposes(int id);
SomeAggregate TestQueryMultiple();
}
public class LibraryRepository : ILibraryRepository
{
private readonly IDbConnection _db;
public LibraryRepository(IDbConnection db)
{
_db = db ?? throw new ArgumentNullException(nameof(db));
}
public IEnumerable<ClientTestPurpose> TestPurposes(int id)
{
return _db.Query<ClientTestPurpose>("SQL here", new { id }, null, true, null, null);
}
public SomeAggregate TestQueryMultiple()
{
string spName = "SQL here";
var spParams = new { Id = 1 };
using (var multi = _db.QueryMultiple(spName, spParams, commandType: CommandType.StoredProcedure))
{
return new SomeAggregate
{
totals = multi.Read<dynamic>().FirstOrDefault(),
aggregates = multi.Read<StatusModel>(),
scripts = multi.Read<LibraryItemModel>(),
runs = multi.Read<RunSummaryModel>(),
filteredTotals = multi.Read<dynamic>().FirstOrDefault()
};
}
}
}
public class SomeAggregate
{
public IEnumerable<dynamic> totals { get; set; }
public IEnumerable<StatusModel> aggregates { get; set; }
public IEnumerable<LibraryItemModel> scripts { get; set; }
public IEnumerable<RunSummaryModel> runs { get; set; }
public IEnumerable<dynamic> filteredTotals { get; set; }
}
/// <summary>
/// Example logic server, that just returns results from repository
/// </summary>
public class SomeLogicService
{
private readonly ILibraryRepository _repo;
public SomeLogicService(ILibraryRepository repo)
{
_repo = repo;
}
public IEnumerable<ClientTestPurpose> DoSomethingWithQuery(int id)
{
return _repo.TestPurposes(id);
}
public SomeAggregate DoSomethingWithQueryMultiple()
{
return _repo.TestQueryMultiple();
}
}
主要思想是将所有数据库特定的东西隐藏在后面,ILibraryRepository
并将您需要测试的所有逻辑移动到某个逻辑服务器,该逻辑服务器将接收存储库作为依赖项。为了存储库中的代码应该简单、明显,包含所有 DB 特定逻辑:连接、事务、命令、对象关系映射等。并且您不需要使用 unt 测试覆盖此代码。但是,您确实涵盖SomeLogicService
了单元测试的代码,因为这是您真正需要测试的内容。您会看到 Dapper 扩展方法是相当低级的抽象,它不会隐藏使用 DB 的细节,它们只是帮手。希望能帮助到你。
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