public void ElementAt()
{
IParsedFile file = new ParsedFile(_sampleFolderPath + "Sample_file.txt");
IParsedLine firstLine = file.NextLine();
string lastElement = firstLine.ElementAt <string>(firstLine.Count - 1);
Assert.Equal("food", lastElement);
IParsedLine peekedSecondLine = file.PeekNextLine();
int number = peekedSecondLine.ElementAt <int>(1);
Assert.Equal(100, number);
const double modifiedNumber = 100 + Math.PI;
peekedSecondLine.Append($" {modifiedNumber}");
IParsedLine secondLine = file.NextLine();
int numberAgain = secondLine.ElementAt <int>(1);
Assert.Equal(number, numberAgain);
double addedNumber = secondLine.ElementAt <double>(secondLine.Count - 1);
Assert.Equal(modifiedNumber, addedNumber, 10);
}
public void LineAt()
{
IParsedFile file = new ParsedFile(_sampleFolderPath + "Sample_file.txt");
IParsedLine lineAt0 = file.LineAt(0);
int n = lineAt0.PeekNextElement <int>();
Assert.Equal(23, n);
int nPlusOne = n + 1;
lineAt0.Append($" {nPlusOne}");
file.Append(new ParsedLine(new[] { nPlusOne.ToString() }));
int totalNumberOfLines = file.Count;
IParsedLine firstLine = file.NextLine();
int nAgain = firstLine.NextElement <int>();
string str = firstLine.NextElement <string>();
int incrementedN = firstLine.NextElement <int>();
Assert.Equal(n, nAgain);
Assert.Equal(nPlusOne, incrementedN);
Assert.Equal("food", str);
IParsedLine lastLine = file.LastLine();
Assert.Equal(incrementedN, lastLine.PeekNextElement <int>());
for (int lineIndex = 1; lineIndex < totalNumberOfLines - 1; ++lineIndex)
{
IParsedLine line = file.NextLine();
int counter = line.NextElement <int>();
for (int j = 0; j < counter; ++j)
{
line.NextElement <int>();
}
while (!line.Empty)
{
line.NextElement <string>();
}
}
IParsedLine extraLine = file.NextLine();
Assert.Equal(incrementedN, extraLine.NextElement <int>());
Assert.True(extraLine.Empty);
Assert.Throws <ArgumentOutOfRangeException>(() => extraLine.ElementAt <string>(1));
Assert.Throws <InvalidOperationException>(() => extraLine.LastElement <string>());
Assert.True(file.Empty);
Assert.Throws <ArgumentOutOfRangeException>(() => file.LineAt(1));
Assert.Throws <InvalidOperationException>(() => file.LastLine());
}
