Visual Studio 2010 Unit Testing. Testing a Function Which Returns Datatable.

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Hi,

I am trying to test a function which returns a datatable using visual studio 2010 testing tool. I am not able to find a correct way to do that. Can anybody help me in doing that?

I am using the below code for testing a datatable

VB

<TestMethod(), _
    HostType("ASP.NET"), _
    AspNetDevelopmentServerHost("<PathOmitted>/<SolutionName>"), _
    UrlToTest("http://localhost:2600/<SolutionName>"), _
    DeploymentItem("<Dll>")> _
   Public Sub GetDivisionCodeTest()

       Dim divDt As New DataTable
       divDt.TableName = "GetDivCode"
       divDt.Columns.Add("BU_CD")
       divDt.Columns.Add("BU_NM")
       Dim row As DataRow = divDt.NewRow
       'divDt.Rows.Add("", "")
       divDt.Rows.Add("51", "HR departments51")
       divDt.Rows.Add("25", "Service Center1")
       divDt.Rows.Add("24", "Testing")
       divDt.Rows.Add("23", "Product")
       divDt.Rows.Add("22", "Dot Net")
       divDt.Rows.Add("21", "Application")
       divDt.Rows.Add("20", "Management")
       divDt.Rows.Add("50", "Sales")
       divDt.Rows.Add("54", "HRT")
       divDt.Rows.Add("37", "Division")
       divDt.Rows.Add("75", "Section 75")
       divDt.Rows.Add("58", "DivDivision")
       divDt.Rows.Add("52", "Sales Department")
       divDt.Rows.Add("89", "skills")
       divDt.Rows.Add("87", "ski")
       divDt.Rows.Add("98", "Division Data")
       divDt.Rows.Add("56", "Training New batch 101")
       divDt.Rows.Add("90", "Department HRD")
       divDt.Rows.Add("35", "Training New batch")
       divDt.Rows.Add("45", "Center")
       divDt.Rows.Add("12", "HR departments1")
       divDt.Rows.Add("99", "software service Center")
       divDt.Rows.Add("64", "Department346")
       divDt.Rows.Add("97", "division9797")

       Dim target As IDRSMaintenance = ServiceLocator.Resolve(Of IDRSMaintenance)() ' TODO: Initialize to an appropriate value
       Dim expected As DataTable = divDt ' TODO: Initialize to an appropriate value
       Dim actual As DataTable
       actual = target.GetDivisionCode()
       Assert.AreEqual(expected, actual)
   End Sub

I am getting the following error.

Assert.AreEqual failed. Expected:<getdivcode>. Actual:<getdivcode>.

I am fetching the actual datatable from my actual code.

Posted 25-Sep-12 18:47pm

Rohith Gopi

Updated 25-Sep-12 19:47pm

v4

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Mehdi Gholam 26-Sep-12 0:58am

What have you done so far?

Rohith Gopi 26-Sep-12 1:48am

I have updated my question

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Dave Kreskowiak · Accepted Answer · 2012-09-25T18:59:00

Solution 1

What's the problem?? Arrange the method call, using Fakes if you have to, call it (Act), then Assert the resulting return value for the existance of an object, it's correct type, expected data, ... It's not much different from getting back a simple value type.

There's little else anyone else can say because you haven't described what you have to do to setup the call or what you're even having a hard time with.

Posted 25-Sep-12 18:59pm

Dave Kreskowiak

Comments

Rohith Gopi 26-Sep-12 2:52am

I am not getting what you are trying to tell.

Dave Kreskowiak 26-Sep-12 8:14am

That much is obvious.

You can't compare two tables the way you are. They will never be equal because they are two different objects with two different addresses in memory. You are no comparing the contents of the data tables, you are comparing the tables themselves.

Building that datatable is a waste of time. All you do is look for those values in the table that's returned from the service.

Rohith Gopi 26-Sep-12 8:28am

Thank you Dave Kreskowiak,

Can you tell me how to compare just the values of the datatable?

Dave Kreskowiak 26-Sep-12 18:30pm

Seriously?? You can't do:

If MyDataTable(rowNumber).Item(columnNumer) <> someValue Then...

Try reading the documentation. This is basic array handling.

Rohith Gopi 26-Sep-12 23:12pm

But this method will be a lengthy one rite..!!?? if there are lot of columns i have to write a line for each and every column.. any other way to do this?? i mean to compare all the column values at once??

Dave Kreskowiak 26-Sep-12 23:42pm

You can "mean" to do that all you want. It's not going to happen unless you write code somewhere to build the table to comare to AND write more code to compare the fields one by one.

Rohith Gopi 27-Sep-12 0:05am

So in short I need to write more code.... :( and there is no short cut for this :(

Thanks Dave
Your explanation was good. Now i got a clear picture about the problem. Thank you for guiding me.