[dba-VB] C# programming exercises: Sample 1 - Run parallel tests from this assembly test classes

Hi Shamil

That looks clever and tight.
I guess if you didn't have the Sleep(1000) method, the code would run with one timestamp only.

But do you really run this from within LINQPad?

/gustav


>>> Salakhetdinov Shamil <mcp2004 at mail.ru> 19-06-12 17:57 >>>
Hi All -

I wanted to share some code snippets I'm getting written here while mastering C# programming using LINQPad.
Presented here code snippet will instantiate and run in parallel two sample test classes resulting in an output as the following:

19.06.2012 19:49:42: Test1 instantiated.
19.06.2012 19:49:42: Test2 instantiated.
19.06.2012 19:49:42: Test1 setup.
19.06.2012 19:49:42: Test2 setup.
19.06.2012 19:49:43: Test2 run started...
19.06.2012 19:49:44: Test1 run started...
19.06.2012 19:49:44: Test2 run completed.
19.06.2012 19:49:44: Test2 tear down.
19.06.2012 19:49:45: Test1 run completed.
19.06.2012 19:49:45: Test1 tear down.

All and any comments & remarks are very welcome!

Thank you.

-- Shamil

P.S. Code snippet:

--- cut here ---

// LINQPad test program start code line - to be commented under VS
static void Main() { Program.Main(); }

// Program - main entry method
class Program
{
	public static void Main(string[] args = null)
	{
		try
		{
		    // Short def: 
			// Run tests from this assembly test classes in parallel
			//
			// Long def:
			// Select classes in this assembly,
			// which type name starts with a string 'Test',
			// order selected type names in ascending order,
			// and then for each selected class
			// start parallel thread, which will
			// create class instance,
			// will cast that instance to ITest interface,
			// and if cast returns not null ITest instance
			// will call Setup(), Run() and TearDown() methods...
			typeof(Program).Assembly.GetTypes()
				.Where(x => x.Name.StartsWith("Test"))
				.OrderBy(x => x.Name) 
				.AsParallel() 
				.ForAll(x => 
					{
					   ITest test = Activator.CreateInstance(x) as ITest;
					   if (test != null) 
					   {
						 System.Console.WriteLine("{0}: {1} instantiated.", DateTime.Now, test.GetType().Name);
					         test.Setup(); 
					   	 test.Run();
						 test.TearDown(); 
					   }
					});
		}
		catch (Exception ex)
		{
			System.Console.WriteLine("Error = '{0}'", ex.Message);   
		}
	}
}

// Logger - utility class
public class Logger
{
	protected void log(params dynamic[] args)
	{
		System.Console.WriteLine(args[0], args[1], args[2].Name);
	}
}

// ITest - test setup, run and tear down interface
public interface ITest
{
	void Setup();
	void Run();
	void TearDown();
}

// Test2 - sample test class
public class Test2: Logger, ITest
{
	public void Setup() 
	{
	 	log("{0}: {1} setup.", DateTime.Now, typeof(Test2));
	} 
	public void TearDown() 
	{
		log("{0}: {1} tear down.", DateTime.Now, typeof(Test2));
	}
	void ITest.Run()
	{
		log("{0}: {1} run started...", DateTime.Now, this.GetType());
		System.Threading.Thread.Sleep(1000);
		log("{0}: {1} run completed.", DateTime.Now, this.GetType());
	}
}

// Test2 - sample test class
public class Test1: Logger, ITest
{
	public void Setup() 
	{
		log("{0}: {1} setup.", DateTime.Now, this.GetType());
		System.Threading.Thread.Sleep(1000);
	} 
	public void TearDown() 
	{
		log("{0}: {1} tear down.", DateTime.Now, this.GetType());
	}
	void ITest.Run()
	{
		log("{0}: {1} run started...", DateTime.Now,  this.GetType());
		System.Threading.Thread.Sleep(1000);
		log("{0}: {1} run completed.", DateTime.Now, this.GetType());
	}
}

-- cut here --

Thank you.

-- Shamil