public void NormalUse()
{
Assert.AreEqual(StringHelpers.CenterAlignText("jos", 30), " jos ");
Assert.AreEqual(StringHelpers.CenterAlignText("4jos", 30), " 4jos ");
Assert.AreEqual(StringHelpers.CenterAlignText("4jos", 2), "4j");
Assert.AreEqual(StringHelpers.CenterAlignText(null, 2), " ");
Assert.AreEqual(StringHelpers.CenterAlignText("", 2), " ");
Assert.AreEqual(StringHelpers.CenterAlignText("a", 0), "");
Assert.ThrowsException <ArgumentOutOfRangeException>(() =>
{
Assert.AreEqual(StringHelpers.CenterAlignText("", -2), null);
});
}