标签：c unit-testing moq azure azure-cosmosdb
我正在使用单元测试来测试DocumentDBRepository类.我以this post作为SQL查询用例的示例.但它显示错误
Message: System.InvalidCastException : Unable to cast object of type
‘System.Linq.EnumerableQuery
to type
‘Microsoft.Azure.Documents.Linq.IDocumentQuery
这是我的DocumentDBRepository类的代码
private IDocumentQuery<T> GetQueryBySQL(string queryStr)
{
var uri = UriFactory.CreateDocumentCollectionUri(_databaseId, _collectionId);
var feedOptions = new FeedOptions { MaxItemCount = -1, EnableCrossPartitionQuery = true };
IQueryable<T> filter = _client.CreateDocumentQuery<T>(uri, queryStr, feedOptions);
IDocumentQuery<T> query = filter.AsDocumentQuery();
return query;
}
public async Task<IEnumerable<T>> RunQueryAsync(string queryString)
{
IDocumentQuery<T> query = GetQueryBySQL(queryString);
List<T> results = new List<T>();
while (query.HasMoreResults)
{
results.AddRange(await query.ExecuteNextAsync<T>());
}
return results;
}
这是我的测试类的代码
public async virtual Task Test_GetEntitiesAsyncBySQL()
{
var id = "100";
string queryString = "SELECT * FROM c WHERE c.ID = " + id;
var dataSource = new List<Book> {
new Book { ID = "100", Title = "abc"}}.AsQueryable();
Expression<Func<Book, bool>> predicate = t => t.ID == id;
var expected = dataSource.Where(predicate.Compile());
var response = new FeedResponse<Book>(expected);
var mockDocumentQuery = new Mock<DocumentDBRepositoryTest.IFakeDocumentQuery<Book>>();
mockDocumentQuery
.SetupSequence(_ => _.HasMoreResults)
.Returns(true)
.Returns(false);
mockDocumentQuery
.Setup(_ => _.ExecuteNextAsync<Book>(It.IsAny<CancellationToken>()))
.ReturnsAsync(response);
var provider = new Mock<IQueryProvider>();
provider
.Setup(_ => _.CreateQuery<Book>(It.IsAny<Expression>()))
.Returns(mockDocumentQuery.Object);
mockDocumentQuery.As<IQueryable<Book>>().Setup(x => x.Provider).Returns(provider.Object);
mockDocumentQuery.As<IQueryable<Book>>().Setup(x => x.Expression).Returns(dataSource.Expression);
mockDocumentQuery.As<IQueryable<Book>>().Setup(x => x.ElementType).Returns(dataSource.ElementType);
mockDocumentQuery.As<IQueryable<Book>>().Setup(x => x.GetEnumerator()).Returns(() => dataSource.GetEnumerator());
var client = new Mock<IDocumentClient>();
client.Setup(_ => _.CreateDocumentQuery<Book>(It.IsAny<Uri>(), It.IsAny<FeedOptions>()))
.Returns(mockDocumentQuery.Object);
var documentsRepository = new DocumentDBRepository<Book>(client.Object, "100", "100");
//Act
var entities = await documentsRepository.RunQueryAsync(queryString);
//Assert
entities.Should()
.NotBeNullOrEmpty()
.And.BeEquivalentTo(expected);
}
断点在此代码行停止：
IQueryable<T> filter = _client.CreateDocumentQuery<T>(uri, queryStr, feedOptions);
filter变量在很多属性上显示null异常,当结果视图显示我在测试方法中定义的期望值时,结果视图显示为空.
有任何线索如何修复它？
解决方法:
需要在模拟的客户端上设置正确的CreateDocumentQuery重载.
被测方法使用
IQueryable<T> filter = _client.CreateDocumentQuery<T>(uri, queryStr, feedOptions);
然而在安排测试时,客户端的设置就像
client
.Setup(_ => _.CreateDocumentQuery<Book>(It.IsAny<Uri>(), It.IsAny<FeedOptions>()))
.Returns(mockDocumentQuery.Object);
应该改为
client
.Setup(_ => _.CreateDocumentQuery<Book>(It.IsAny<Uri>(), It.IsAny<string>(), It.IsAny<FeedOptions>()))
.Returns(mockDocumentQuery.Object);
因为有额外的queryStr参数.它也可以直接使用字符串参数作为替代,因为它被明确地注入到方法中并且可以用作期望的一部分.
client
.Setup(_ => _.CreateDocumentQuery<Book>(It.IsAny<Uri>(), queryStr, It.IsAny<FeedOptions>()))
.Returns(mockDocumentQuery.Object);
由于测试中的方法在构建查询时没有直接使用Linq,因此不需要像在本主题的上一次迭代中那样模拟/覆盖查询提供程序
以上是经过上述更改后的完成测试
public async virtual Task Test_GetEntitiesAsyncBySQL() {
//Arrange
var id = "100";
string queryString = "SELECT * FROM c WHERE c.ID = " + id;
var dataSource = new List<Book> {
new Book { ID = "100", Title = "abc"}
}.AsQueryable();
Expression<Func<Book, bool>> predicate = t => t.ID == id;
var expected = dataSource.Where(predicate.Compile());
var response = new FeedResponse<Book>(expected);
var mockDocumentQuery = new Mock<IFakeDocumentQuery<Book>>();
mockDocumentQuery
.SetupSequence(_ => _.HasMoreResults)
.Returns(true)
.Returns(false);
mockDocumentQuery
.Setup(_ => _.ExecuteNextAsync<Book>(It.IsAny<CancellationToken>()))
.ReturnsAsync(response);
//Note the change here
mockDocumentQuery.As<IQueryable<Book>>().Setup(_ => _.Provider).Returns(dataSource.Provider);
mockDocumentQuery.As<IQueryable<Book>>().Setup(_ => _.Expression).Returns(dataSource.Expression);
mockDocumentQuery.As<IQueryable<Book>>().Setup(_ => _.ElementType).Returns(dataSource.ElementType);
mockDocumentQuery.As<IQueryable<Book>>().Setup(_ => _.GetEnumerator()).Returns(() => dataSource.GetEnumerator());
var client = new Mock<IDocumentClient>();
//Note the change here
client
.Setup(_ => _.CreateDocumentQuery<Book>(It.IsAny<Uri>(), It.IsAny<string>(), It.IsAny<FeedOptions>()))
.Returns(mockDocumentQuery.Object);
var documentsRepository = new DocumentDBRepository<Book>(client.Object, "100", "100");
//Act
var entities = await documentsRepository.RunQueryAsync(queryString);
//Assert
entities.Should()
.NotBeNullOrEmpty()
.And.BeEquivalentTo(expected);
}
标签：c,unit-testing,moq,azure,azure-cosmosdb 来源： https://codeday.me/bug/20190627/1304474.html
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