Find total number of Unit Test in different DLLs - vb.net

Question

I have a Project where we have different kinds of unit tests in different DLLs. I want to know total number of unit tests in whole solution as well as the Test Category, Owner name, etc. using some VB/C# code.
Actually, I need to prepare report daily, where I need to show how many unit test are written by whom and under which category
I do not want to open Visual Studio to know this.
This is an example signature for one of the unit tests:
<TestMethod()> <Owner("OwnerName"), TestCategory("Category22")>
Public Sub TestName()
............
............
End Sub

Answer 1

Since the test methods are documented using .Net Framework attributes, you can use reflection to obtain the information you need. In VB.net, you can do it as follows.
'Imports System.Reflection
'Imports TestLibrary <- wherever the attributes are defined
Dim assy As Assembly = Assembly.LoadFrom(filename)
Dim owner As OwnerAttribute
Dim category As TestCategoryAttribute
For Each t As Type In assy.GetTypes()
For Each mi As MethodInfo In t.GetMethods(BindingFlags.Public Or BindingFlags.Instance)
If Not mi.GetCustomAttributes(GetType(TestMethodAttribute)).Count() = 0 Then
owner = mi.GetCustomAttribute(Of OwnerAttribute)()
category = mi.GetCustomAttribute(Of TestCategoryAttribute)()
System.Diagnostics.Debug.Print("{0} : Owner='{1}' Category='{2}'",
mi.Name, owner.OwnerName, category.CategoryName)
End If
Next
Next
You do have to add the test framework DLL as a reference to the project. filename is the full path to the compiled assembly (EXE, DLL, etc). I didn't include error checking for space reasons.
If your test method isn't public, or it's static you can get it by changing the binding flags to BindingFlags.NonPublic or BindingFlags.Static respectively. (More information is available in the documentation.)
Note that this method also works in C#
Assembly assy = Assembly.LoadFrom(filename);
OwnerAttribute owner = null;
TestCategoryAttribute category = null;
foreach(Type t in assy.GetTypes())
{
foreach (MethodInfo mi in t.GetMethods(BindingFlags.Public | BindingFlags.Instance))
{
if (mi.GetCustomAttributes(typeof(TestMethodAttribute)).Count() != 0)
{
owner = mi.GetCustomAttribute<OwnerAttribute>();
category = mi.GetCustomAttribute<TestCategoryAttribute>();
System.Diagnostics.Debug.Print("{0} : Owner='{1}' Category='{2}'",
mi.Name, owner.OwnerName, category.CategoryName);
}
}
}