[英]unit testing generic method with moq
I have a generic method which returns list of records from table: 我有一个通用的方法,它从表中返回记录列表:
public List<T> GetValidRecords<T>() where T: class, IGetListOfTables
{
try
{
return _context.Set<T>().Where(x => x.Valid == 1).ToList();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
and I have an unit test for this method: 我对此方法进行了单元测试:
[TestMethod]
public void GetValidRecords()
{
var data = new List<tableName>
{
new tableName() {Valid= 1},
new tableName() {Valid= 1}
}.AsQueryable();
var mockSet = new Mock<DbSet<tableName>>();
mockSet.As<IQueryable<tableName>>().Setup(m => m.Provider).Returns(data.Provider);
mockSet.As<IQueryable<tableName>>().Setup(m => m.Expression).Returns(data.Expression);
mockSet.As<IQueryable<tableName>>().Setup(m => m.ElementType).Returns(data.ElementType);
mockSet.As<IQueryable<tableName>>().Setup(m => m.GetEnumerator()).Returns(data.GetEnumerator());
var mockContext = new Mock<ALMONEntitiesNew>();
mockContext.Setup(x => x.tableName).Returns(mockSet.Object);
var database = new Database(mockContext.Object);
var numberOfRecords = database.GetValidRecords<tableName>();
Assert.AreEqual(2, numberOfRecords.Count, "Wrong number of valid records.");
}
The problem is that I get actual number of records from table, and not moqed number. 问题是我从表中获取了实际记录数,而不是完整的记录数。 How can I fix it? 我该如何解决?
You need to get all dependencies on EF implementation out of the GetValidRecords method, particularly _context otherwise EF specific implementation is going to constantly bleed into your unit tests. 您需要从GetValidRecords方法中获取对EF实现的所有依赖关系,尤其是_context,否则EF特定的实现将不断渗入您的单元测试中。 In order to test GetValidRecords as a unit you need to make it be able to stand on it's own. 为了将GetValidRecords作为一个单元进行测试,您需要使其能够独立存在。 If you want to test it as it is I suggest using an integration test, which is actually retrieving records from the db and asserting they came back OK - this would not require the use of any mocking framework, and is a perfectly OK way to test this functionality. 如果您想按原样进行测试,我建议您使用集成测试,该测试实际上是从数据库中检索记录并断言它们返回了OK-这不需要使用任何模拟框架,并且是测试的一种完美的方式此功能。
On the topic of making GetValidRecords stand alone, I see that DbSet implements IEnumerable, so maybe what you want is something like this: 关于使GetValidRecords独立存在的主题,我看到DbSet实现了IEnumerable,所以也许您想要的是这样的:
public static List<T> GetValidRecords<T>(this IEnumerable<T> source) where T: class, IGetListOfTables
{
if (null == source)
{
throw new ArgumentNullException("source");
}
return source.Where(x => x.Valid == 1).ToList();
}
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