public void WriteToFile_StringIsNull_ReturnsArgumentException()
{
//Arrange
var filePath = "sample.txt";
string str = "";
//Act
//Act => Assert
Assert.ThrowsException <ArgumentException>(() => FileExtention.WriteToFile(filePath, str));
}
public void WriteToFile_FileDoesNotExists_ReturnsFileNotFoundException()
{
//Arrange
var filePath = "sample_of_non_existing_file.txt";
var str = "Test string";
//Act
//Act => Assert
Assert.ThrowsException <FileNotFoundException>(() => FileExtention.WriteToFile(filePath, str));
}