How to Mock Subsonic ExecuteReader method? - subsonic

Question

I have a method that calls stored procedure and returns the data after executing DataReader.
I am trying to test the method using mock. I am not sure how to return value?
Anyone did this? Appreciate your responses.
Here is my code:
// Call the StoredProcedure
public List<string> GetCompletedBatchList(int fileId)
{
List<string> completedBatches = new List<string>();
StoredProcedure sp = new StoredProcedure("GetDistributedBatches", this.dataProvider);
sp.Command.AddParameter("FileID", fileId, DbType.Int32, ParameterDirection.Input);
sp.Command.AddParameter("Result", null, DbType.Int32, ParameterDirection.InputOutput);
using (var rdr = sp.ExecuteReader())
{
while (rdr != null && rdr.Read())
{
if (rdr[0] != null)
{
completedBatches.Add(rdr[0].ToString());
}
}
}
return completedBatches;
}
Here is the Test Method:
[Test]
public void Can_get_completedBatches()
{
var file = new File() { FileID = 1, DepositDate = DateTime.Now };
repo.Add<File>(file);
CompletedBatches completedBatches = new CompletedBatches(provider.Object);
//Here I am not sure how to Return
provider.Setup(**x => x.ExecuteReader(It.IsAny<QueryCommand>())).Returns** =>
{
cmd.OutputValues.Add(0);
});
var completedBatchesList = completedBatches.GetCompletedBatchList(file.FileID);
Assert.AreEqual(0, completedBatchesList.Count());
}

Answer 1

If you want to create a DataReader of a certain shape and size then I suggest you look at DataTable.CreateDataReader DataTable.CreateDataReader. You can then setup the ExecuteReader in your example to return this datareader.

Answer 2

The following link helped me...
How to mock an SqlDataReader using Moq - Update
I used MockDbDataReader method to mock the data
[Test]
public void Can_get_completedBatches_return_single_batch()
{
var date = DateTime.Now;
var file = new File() { FileID = 202, DepositDate = DateTime.Now };
var batch1 = new Batch() { FileID = 202, BatchID = 1767, LockboxNumber = "1", IsLocked = true, LockedBy = "testUser" };
var transaction1 = new Transaction() { BatchID = 1767, TransactionID = 63423, CheckAmount = 100.0 };
var distribution1 = new Distribution() { TransactionID = 63423, InvoiceNumber = "001", Amount = 100.0, DateCreated = date, DateModified = date, TransType = 2 };
repo.Add<File>(file);
repo.Add<Batch>(batch1);
repo.Add<Transaction>(transaction1);
repo.Add<Distribution>(distribution1);
CompletedBatches completedBatches = new CompletedBatches(provider.Object);
provider.Setup(x => x.ExecuteReader(It.IsAny<QueryCommand>())).Returns(MockDbDataReader());
var completedBatchesList = completedBatches.GetCompletedBatchList(202);
Assert.AreEqual(1, completedBatchesList.Count());
}
// You should pass here a list of test items, their data
// will be returned by IDataReader
private DbDataReader MockDbDataReader(List<TestData> ojectsToEmulate)
{
var moq = new Mock<DbDataReader>();
// This var stores current position in 'ojectsToEmulate' list
int count = -1;
moq.Setup(x => x.Read())
// Return 'True' while list still has an item
.Returns(() => count < ojectsToEmulate.Count - 1)
// Go to next position
.Callback(() => count++);
moq.Setup(x => x["BatchID"])
// Again, use lazy initialization via lambda expression
.Returns(() => ojectsToEmulate[count].ValidChar);
return moq.Object;
}