public void Test_End_To_End()
{
string input = "9\r\n" +
"8\r\n" +
"nothing\r\n" +
"13\r\n" +
"-87\r\n" +
"2";
string expected = "9:3,3\r\n" +
"8:2,2,2\r\n" +
"13:13\r\n" +
"-87:1\r\n" +
"2:2\r\n";
var standardOut = new StringWriter();
var errorOut = new StringWriter();
var logger = new ConsoleLogger(standardOut, errorOut);
IPrimeFactorCalculator calculator = new PrimeFactorCalculator(); // The main calculator.
calculator = new PrimeFactorOutputWriter(calculator, logger); // Our formatter for dumping to the console
calculator = new PrimeFactorExceptionLogger(calculator, logger); // An exception handler that can log errors for us.
var path = TempFileHelpers.CreateTestFile(input);
IIntegerReader reader = new IntegerFileReader(path);
int? number;
while ((number = reader.ReadNext()) != null)
{
calculator.Execute(number.Value);
}
Assert.AreEqual(expected, standardOut.ToString());
Assert.AreEqual(string.Empty, errorOut.ToString());
}
public void Test_Garbage_Multiple_Numbers()
{
var path = TempFileHelpers.CreateTestFile("321\r\n123");
var reader = new IntegerFileReader(path);
var number = reader.ReadNext();
Assert.IsTrue(number.HasValue);
Assert.AreEqual(321, number.Value);
number = reader.ReadNext();
Assert.IsTrue(number.HasValue);
Assert.AreEqual(123, number.Value);
}
public void Test_Empty_File()
{
var path = TempFileHelpers.CreateTestFile(string.Empty);
var reader = new IntegerFileReader(path);
// Make sure that we don't read anything.
Assert.AreEqual(reader.ReadNext(), null);
}
public void Test_Garbage_Before_Number_File()
{
var path = TempFileHelpers.CreateTestFile("Stuff\r\n123");
var reader = new IntegerFileReader(path);
var number = reader.ReadNext();
Assert.IsTrue(number.HasValue);
Assert.AreEqual(123, number.Value);
}
public void Test_Missing_File()
{
var path = Path.Combine(Path.GetTempPath(), "FileThatDoesNotExist.txt");
// Ensure that the file wasn't created for whatever reason.
Assert.IsFalse(File.Exists(path));
var reader = new IntegerFileReader(path);
Assert.Throws<FileNotFoundException>(() =>
reader.ReadNext(),
"A missing file exeption was not fired."
);
}