public void IstTextFile_ValidFileName_ReturnsTrue(string fileName)
{
//Act
bool result = Stringhelper.IsTextFile(fileName);
//Assert
Assert.IsTrue(result);
}
public void IsTextFile_InvalidFileName_ReturnsFalse(string fileName)
{
bool result = Stringhelper.IsTextFile(fileName);
Assert.IsFalse(result);
}