Hi!
I have a question regarding testing private static methods.
Let's suppose I have a class like this
public class DbUtils
{
static private String GenerateDbTestName(string filePath)
{
if (filePath == null)
throw new ArgumentNullException("filePath");
if (String.IsNullOrEmpty(filePath))
throw new ArgumentException("filePath");
return "something";
}
}
I would like to test this method, so I do:
public class DbUtilsTests
{
private Reflector reflector;
[SetUp]
public void SetUp()
{
reflector = new
Reflector(typeof(DbUtils).Assembly.FullName,
typeof(DbUtils).FullName);
}
[Test]
[Description("Przekazanie nieprawidłowych parametrów do metody
GenerateDbTestName.")]
public void
GenerateDbTestNameWithWrongParamsThrowsException_Test()
{
Assert.Throws<ArgumentNullException>(() =>
reflector.InvokeMethod(AccessModifier.Static, "GenerateDbTestName",
null));
Assert.Throws<ArgumentException>(() =>
reflector.InvokeMethod(AccessModifier.Static, "GenerateDbTestName",
(object)""));
}
}
After running a test I receive:
Test has failed.
The block threw an exception of a different type than was expected.
Expected Exception Type : System.ArgumentNullException
MbUnit.Framework.Reflection.ReflectionException: Fail to find
GenerateDbTestName Method in PMSLabs.Tester.DbUtils.
w MbUnit.Framework.Reflection.Reflector.EnsureMemberExists(Object
obj, Object member, String memberName, MemberType type) w c:\RelEng
\Projects\MbUnit v3.1\Work\src\MbUnit\MbUnit\Framework\Reflection
\Reflector.cs:wiersz 486
etc.
If I change the tested class to be static, the result is worst,
because a SetUp method throws
Test has failed.
Failure to invoke test setup method
System.NullReferenceException
(...)
Stack:
c:\RelEng\Projects\MbUnit v3.1\Work\src\MbUnit\MbUnit\Framework
\Reflection\Reflector.cs(234, 13) : System.Object
CreateInstance(System.String, System.String, System.Object[])
c:\RelEng\Projects\MbUnit v3.1\Work\src\MbUnit\MbUnit\Framework
\Reflection\Reflector.cs(43, 9) : Void .ctor(System.String,
System.String)
E:\(...)\DbUtilsTests.cs(21, 13) : Void SetUp()
How is it possible to test private static methods?
Thanks in advance for help.
Regards,
Lucek
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