对 Azure Table 存储的检索 Table 操作进行单元测试

Question

我有一些代码想要进行单元测试。
作为我想要测试的方法的一部分，我正在从 Azure 存储 Table 数据库中检索一些数据，因此我需要从数据库中模拟出 return。

要测试的代码：

public class GetCustomer : IGetCustomer
{
   //constructor
   public GetCustomer(IClientTableFactory clientTableFactory)
   {
      _partitionKey = "test";
      _customersTable = clientTableFactory.GetStorageTable("customers");
   }

   //method to test
   public async Task<string> GetCustomerNameAsync(string email)
   {
      //match on full email
      var match = await SearchAsync(email.ToLower());
      if (match == null)
      {
         //just match on email domain
         var domain = email.ToLower().Substring(email.IndexOf("@"));
         match = await SearchAsync(domain);
      }
      return match;
   }

   //internal method that queries Azure Table Storage
   private async Task<string> SearchAsync(string searchString)
   {
      var query = TableOperation.Retrieve<Customer>(_partitionKey, rowkey: searchString);
      var result = await _customersTable.ExecuteAsync(query);
      var match = result.Result as Customer;
      return match?.Name;
   }
}

到目前为止的单元测试：

//Arrange
var email = "Testy.McTest@Test.com.au";
var tableFactory = new Mock<IClientTableFactory>();
var customersTable = new Mock<CloudTable>(new Uri("http://unittests.localhost.com/FakeTable"));
customersTable.Setup(x => x.ExecuteAsync(It.IsAny<TableOperation>()))
   .ReturnsAsync(new TableResult{ HttpStatusCode = 200, Result = new Customer{ Name = "jiminy crickets" }});
tableFactory.Setup(x => x.GetStorageTable("customers")).Returns(customersTable.Object);
var getCustomers = new GetCustomer(tableFactory.Object);
// Act
var result = await getCustomers.GetCustomerNameAsync(email);
// Assert
Assert.AreEqual("jiminy crickets", result);

当然，每次都通过测试。我想模拟的拼图缺失的部分是这一行：

customersTable
    .Setup(x => x.ExecuteAsync(It.IsAny<TableOperation>()))
    .ReturnsAsync...

我应该可以用我的搜索查询替换 It.IsAny<TableOperation>()，例如 It.Is<TableOperation>(y => y.RowKey == "testy.mctest@test.com.au"，但不幸的是 RowKey 无法访问。

我也试过了

customersTable
    .Setup(x => x.ExecuteAsync(TableOperation.Retrieve<Customer>(_partitionKey, rowkey: searchString))

但它从不在运行时传递此代码 - 可能是因为 ETag 属性?

有什么想法吗？我已经看到很多关于模拟 Table 存储的答案，但是 none 关于模拟查询结果的答案。

Answer 1

如果您不介意使用反射，您可以在内部成员“RetrievePartitionKey”和“RetrieveRowKey”中找到值。

我写了一个简单的方法：

  private T GetInternalMember<T>(object obj, string propertyName)
    {
        Type objType = obj.GetType();
        PropertyInfo propInfo = objType.GetProperty(propertyName,
                BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);

        return (T)propInfo.GetValue(obj, null);
    }

我使用它的方式如下：

cloudTable.Verify(x => x.ExecuteAsync(It.Is<TableOperation>(op => GetInternalMember<string>(op, "RetrievePartitionKey") == "TestPartitionKey"
                                                                           && GetInternalMember<string>(op, "RetrieveRowKey") == "TestRowKey")));

它不是很理想，但它适用于单元测试。

对 Azure Table 存储的检索 Table 操作进行单元测试

Unit Testing a Retrieve TableOperation for Azure Table Storage

c#

unit-testing

moq

azure

azure-table-storage