Extreme Programming

File IO Tests

For this, we need to determine about the minimum characteristics of file IO capabilities.  Whenever you open a streamreader or streamwriter object, you must ensure the object is disposed, and so using is a nice keyword to use for this.  An example of using is defined below:

using (StreamWriter writer = new StreamWriter(this.GetPath(), false))
{
    writer.Write("Test");
}

The using keyword is useful when the object you are instantiating implements IDisposable.  This is because it will automatically handle disposing of the object for you; this way, we can ensure that the writer is closed upon completion, and the file will not be locked for the next reader/writer access.

From this, I create the following tests:

[TestFixture()]
public class FileIOTest
{
    private string GetPath()
    {
        return AppDomain.CurrentDomain.BaseDirectory + "\\test.tl";
    }

    [Test()]
    public void TestWriteToFile()
    {
        using (StreamWriter writer = new StreamWriter(this.GetPath(), false))
        {
            writer.Write("Test");
        }

        using (StreamReader reader = new StreamReader(this.GetPath()))
        {
            Assert.AreEqual("Test", reader.ReadToEnd());
        }
    }

    [Test()]
    public void TestWriteLineToFile()
    {
        using (StreamWriter writer = new StreamWriter(this.GetPath(), false))
        {
            writer.WriteLine("Test");
        }

        using (StreamReader reader = new StreamReader(this.GetPath()))
        {
            Assert.AreEqual("Test\r\n", reader.ReadToEnd());
        }
    }

    [Test()]
    public void TestWriteLinesToFile()
    {
        using (StreamWriter writer = new StreamWriter(this.GetPath(), false))
        {
            writer.WriteLine("Test");
        }

        using (StreamReader reader = new StreamReader(this.GetPath()))
        {
            Assert.AreEqual("Test\r\n", reader.ReadToEnd());
        }

        using (StreamWriter writer = new StreamWriter(this.GetPath(), true))
        {
            writer.WriteLine("Test");
        }

        using (StreamReader reader = new StreamReader(this.GetPath()))
        {
            Assert.AreEqual("Test\r\nTest\r\n", reader.ReadToEnd());
        }
    }
}

All of these tests worked successfully.  But, I had been thinking about using XML, and so the next test we will have to perform will use the XML objects to access it.